Glossary of the terms used in the chapter.
\r\n\tThis necessitated a need to understand control theoretical concepts and system analysis in a discrete time domain, which gave rise to the area of discrete time control systems. This has helped control engineers and designers to theoretically ascertain the possibilities and limitations of a control system design implemented in a digital framework, whereas continuous time designs suffer from the essential mismatch in the nature of the underlying independent time variable in theoretical studies and practical implementation. Also, many practical systems are inherently discrete time in nature, sensors and transducers sample data only at fixed time intervals, and computers calculate the control input only in some finite time.
\r\n\tTraditionally, fundamental concepts of discrete time control systems are derived from the continuous time counterpart upon time discretization of the latter and subsequent formal analysis. This gave rise to discrete time counterparts of system models and controllers in z-domain as well as in state space form. However, discrete time control system design and analysis matured as a discipline in itself with the advent of optimal and adaptive techniques solely based on discrete time approach. Robust nonlinear discrete time controllers were also developed utilizing the ideas of sliding modes, model predictive control, etc.
\r\n\tThe techniques for parameter estimation and system identification are largely dominated by discrete time methods. Well-established Kalman filter and extended Kalman filters are developed in discrete time. Many discrete time stochastic filters are utilized in control systems to reduce the impact of noise and disturbance during practical implementation.
\r\n\tDespite the developments in discrete time control designs and their usefulness in control system implementation, there are a few challenges like discretization effect on systems stability, communication loss, etc. which are also areas of serious research. With all its usefulness and limitations, discrete time control systems have found vast areas of application from process control and automation, robotics, network control systems and internet of things, control of networks and multi-agent systems, etc.
\r\n\tThis book intends to provide the reader with an overview of detailed control system design methodologies in discrete time which are well-established in literature. Emerging areas of interest in discrete time systems catering to new and existing challenges are also welcomed.
Forests cover about 4.0 billion hectares in the world. All decisions and/or actions adopted in order to preserve, to conserve, and to harvest forests and trees within them Bettinger et al. [1] Grebner et al. [2] are expression of the forest management. It is also defined as a tool that forest-owners use to achieve social, economic, and environmental targets or also to implement sustainable forest management. Two of the following approaches characterize forest management:
Monitoring approach, through observation, monitoring, elaboration data, and e-reporting of forest ecosystem state
Technologic approach, through machines, tools, materials, and forest workers
The first approach concerns primary forest area, while the second is adopted in modified forests, planted forests, and other areas with trees that consist of 2.7 billion hectares (Figure 1) of the global forest area. For the modified forests, one of the most relevant actions is stand management. This management is
necessary, given the alteration (structural and compositional) these ecosystems have recorded over the centuries due to human activities;
functional, to ensure the ecosystem perpetuity and guarantee overtime forest ecosystem services that influence the well-being of the humankind; and
appropriate, in order to increase the resilient capacity of ecosystems currently under strong pressure due to socio-economic activities, climate change, and other global and local disturbance processes.
The 4.0 billion hectares of forest area in the world articulated for anthropization categories (data × 1000 hectares). Source: FAO (2015).
This action satisfies the aims of both forest landowners (FLOs) and logging companies (LCs). Using silvicultural criteria and proper manners, FLOs quantify the intervention in order to ensure the perpetuity of ecosystem (long-term vision) given by the forest’s natural renovation capacity. LCs’ point of view concerns the wood fraction exploitable (stand removal), which is the main output in timber transformation chains (short-term view). In the sustainable economic development policy, forests assume relevant roles [3]. That can be shortly explained as follows:
Wood is a renewable natural resource.
Timber is the main tangible output compared to other nontimber products.
Timber in itself is an ecosystem service provider that provides bio-based resources and also biomass for clean energy production.
Forest ecosystems guarantee regulative ecosystem services related to climate change contrast strategies and other global degradation processes.
Forest ecosystems are areas where individuals or groups can live important social and sensorial experiences and increase their knowledge on natural life processes.
Using the Italian forest system as background, this topic has been developed in order to provide an international dimension.
\nA complementary relation exists between FLOs and LCs (Figure 2). FLOs are responsible overtime for the stand management. Silvicultural managements implemented during forest lifetime have influence on timber and nontimber products. However, FLOs normally do not have resources and knowledge to implement silvicultural management by themselves and sell timber products. The high investments needed for achieving an efficient and technological mechanization level, from an economic and financial point of view, would not be justified if the FLOs manage periodically small forest area, as the majority of FLOs in Europe. According to these evidences, FLOs entrust this job to specialized units, such as LCs, which have machines, technologies, materials, and workers with the knowledge of timber transformation process. Finally, LCs have proper knowledge to achieve the highest market price, given the market situation and the current economic trends.
\n\nRelationship between forest land owners and logging companies. Source: Our elaboration.
Regardless of how stand management is entrusted to LCs, one of the mandatory steps is to determine the related costs. In dedicated literature [4, 5, 6], this topic is solved considering the operative cost only. However, differences exist between the type of costs and the calculation method, while transaction and overhead costs and revenues are not considered at all.
\nIn the 1990s, the reducing impact logging (RIL) technique [7, 8] was introduced in the tropical region. It was defined as an “Intensively planned and carefully controlled implementation of harvesting operations to minimise the impact on forest stands and soils, usually in individual tree selection cutting” [9, 10]. The main idea was to adopt a more rational and structured method for forest exploitation. So far, new transaction and overhead cost were introduced in the forest management. More recently, according to the social and environmental relevance of forests, in many countries, forest management is strongly influenced by decisions of forest institution. The main institutions concern the: (a) introduction of forestry and environmental laws and rules; (b) introduction of administrative procedures for safeguarding forest public interest; (c) definition of roles and responsibilities for the economic subjects involved in the transformation process; and (d) redaction of the accidental risks and promotion of high health standards to forest workers.
\nThe main assumptions adopted in the contribution concern economic subjects, operators, and capitals (workers, machines, material, etc.) involved in the transformation processes. Each of them must be paid for the performances provided. Technical and legal aspects are presented as background, while the core is based on the introduction of transformation steps, from being trees of the forest ecosystem to becoming market products. Timber production is one of the ecosystem services of forest ecosystems. Using the analytical approach, costs and revenue have been identified for each technical centrum of expenditure. Dedicated presentation and information have been provided on calculation method and data sources; however, in Table 1, a glossary of the main controversial terms has been developed.
\n\n\nWood | \nIt is the hard, fibrous, and structural tissues, composed of chains of cellulose, which forms the main substance of the trunk, branches, and roots of trees or shrubs. | \n
Timber | \nIt is the term to identify products obtained from the trunk, branches, and roofs of trees, at any stage after the tree has been felled. It includes the raw material, also known as rough timber or the processed material, used for construction, as firewood, and as other bio-based products. | \n
Price | \nIt is the amount of money that a buyer and a seller agree at the end of a negotiation to exchange between goods for money. In particular, there are a buyer willingness to pay and a seller willingness to accept in order to exchange the property right of goods and services. That information is collected specifically from the market. | \n
Value | \nIt is an amount (or datum) expressed in monetary metric, produced by experts or single individuals, using simple or complex elaborations, with the support of higher or lower technologies. Given a market price if it was subjected to any elaboration, example timber market price (€) multiply by quality (ton), the result is a value [€ × ton]. | \n
Forest management | \nIt is all decisions and/or actions adopted in order to preserve, conserve, and use forests and trees within them. | \n
Stand management | \nIt is all decisions and/or actions related to the stand. | \n
Silviculture management | \nIt is the mode by which forest management is implemented. | \n
Forest utilization | \nIt is the action usually developed from the LC. Selected trees are felled and processed to obtain marketable timber. | \n
Glossary of the terms used in the chapter.
Forests provide a large spectrum of ecosystem services that produce well-being to the humanity. Consequently, many institutions currently put silvicultural management under laws and regulations discipline. The target of institutions and administrative proceedings is to safeguard the public interest on forest ecosystems [11].
\nThe following are the two main consequences:
Introduction of administrative procedures, at the end of which the FLOs obtain the right to perform the silvicultural intervention
Introduction of transaction costs to prepare the technical documentation necessary to satisfy the administrative process
Utilization intervention can take place under the regime of the following:
Sale: with which the property transfers to the LCs the property rights of the forest stand destined to be felled
Contract: with which the FLOs entrust through the acquisition of LC services, the forest harvesting operations, while they maintain the timber ownership
Economy: where the FLOs, in particular the public ones, decide to carry out the work in-house, using the own property, in particular machinery, other tools, and forest workers enrolled
Regardless of the regime, the entrustment can be done in terms of the following:
Purchase all timber at fixed price: LC undertakes to carry out the intervention at the agreed and invariable price respecting the identified unit and following technical indications from the project and the subsequent notes of the competent institutions.
Based on a fixed price for unit: regime that requires the commitment by the property to pay the intervention at the fixed price per unit (usually volume or area), as well as the commitment by the company to quantify ex-post the volume or the area.
Mixed, partly defined at fixed price, and partly on the fixed price for unit.
These aspects are usually clearly stated in the contract. Further mutual fundamental obligations are:
for the FLOs: to certify that they have fulfilled all procedures necessary to obtain the authorization to carry out the silvicultural intervention and all provisions have been transposed in area (boundaries of the forest area under management have been marked, trees that shall be fell are also marked, etc.). Documents produced and received must be available to the LCs, which will be used at the end for monitoring the correctness of developed activity; and
for the LCs: to be aware of the territorial unit where they must operate, the characteristics of the stand and the area, as well as the nature of the silvicultural intervention to be implemented. The LCs certify to be fully aware of the technical and technological complexity level of the silvicultural intervention, to be aware of the appropriate methods to carry it out, as well as to have availability of equipment, workers, and materials necessary for its execution in due time.
Evaluation processes require relevant technical information such as: (a) the forest areas in which the stand involved in the management activity is located; (b) the timber volume that should be felled; and (c) the type of marketable products that could be obtained.
\nIf the stand of volume, silvicultural intervention, and felled timber are expressed in cubic meter, among them, the following relation subsists:
\nAnd solved for SI, it becomes
\nwhere [SoV] is the volume of stand invested in the ground until cutting intervention starts; [SI] is the volume of trees left in the ground at the end of the harvesting process; and [TH] is the volume of the trees felled and transformed in market goods from the LCs. Silvicultural intervention is indirectly obtained by felling wood volume in excess, given the adopted forest management system. In other words, it is the result of the forest left in the ground after the trees cut by LCs are already in the market. The function is always verified at the time that felling activity starts.
\nSilviculture proposes different management methods, in relation to the auto-ecology of the species and forest community, as well as the land characteristics, forest state and type of the previous management, objectives pursued, and infrastructures. The characteristics of each intervention are defined in terms of the following:
Volume of the stems that must be released
Characteristics of the trees to be released with respect to the horizontal (territorial distribution) and vertical (stand stratigraphy) plane
Characteristics of the trees to be released for environmental needs, biodiversity, and other nonproductive functions
Given the total volume that insists in the area just before felling activity starts, the magnitude of the intervention can be quantified in terms of volume to be withdrawn \n
Basing on the size of the withdrawal, it is possible to have a qualitative indication of the intervention and consequently an estimation of expected revenue (Table 2). Minor interventions, refereed to particularly small volume withdrawals, don’t need a high mechanization level, which determines the growing employment of workers and a modest productivity. The unit costs of the intervention are high, if compared to constant revenues, with a negative balance. Interventions with higher withdrawals allow the use of higher levels of mechanization, lower use of labor, and consequently greater productivity. These conditions lead to a growing budget balance.
\nMagnitude of treatment | \nMechanization level | \nWorkers’ qualification | \nProductiveness | \nMonetary results | \n||
---|---|---|---|---|---|---|
Costs | \nRevenue | \nBudget performance | \n||||
Slight | \nLow | \nLow skill | \nLow | \nHigh | \nLow | \nNegative | \n
Intermediate | \nMedium skill | \nModerate | \nModerate—high | \nLow | \nNegative—variable | \n|
Moderate | \nIntermediate | \nMedium skill | \nModerate—high | \nModerate | \nMedium—good | \nPositive | \n
Advanced | \nSkill | \nHigh | \nModerate—high | \nVariable results | \nVariable | \n|
Effective | \nAdvanced | \nSkill | \nVery high | \nModerate—low | \nSubstantial | \nPositive | \n
Intense | \nHigh skill | \nHigh | \nModerate | \nMedium—good | \nVariable | \n|
Intensive | \nIntense | \nHigh skill | \nVery high | \nLow | \nSubstantial | \nPositive | \n
There are different types of forestry yard. The first classification is based on 4 mechanization levels (Tables 3, 4, 5, and 6). The former is characterized by high investments and high productivity, with decreasing average costs by increasing processed volumes (intense – Table 3); the lower mechanization level is characterized by increasing operating costs by decreasing productivity of processes and work (low or based on animal power—Table 6). Other mechanization levels are advanced (Table 4) and intense (Table 5).
\nLevel of mechanization applied in the forest yard: intense. Chainsaw is the machine common in all the levels, but reported only in this table, in order to limit the repetition.
Level of mechanization applied in the forest yard: advanced.
Level of mechanization applied in the forest yard: intermediate.
Level of mechanization applied in the forest yard: low.
The second classification can be based on the type of productions in the forest (or productions at the felling site). There are four logging system classes (Tables 7, 8, 9, and 10), such as the following:
Full tree logging system (Whole tree harvesting system) (Table 7)
Tree length logging system (Table 8)
Intermediate (mix) logging system (Table 9)
Short wood logging system (Table 10)
Logging systems: Extraction of full trees (TLS) (branch and top).
Logging system: Tree length (TLS). Extraction of full stem.
Logging system: Intermediate system: Tree length/short wood (cut to length CTL). Extraction full stand cross cutting to multiple market assortments.
Short wood system (SWS): Wood processed in final assortment in forest.
Each type of forestry yard is characterized by different cost dynamics:
Cost for activity in forest: decreasing costs by reducing the work for each tree
Cost for bunching-extraction: increasing costs by increasing number of logs to be bunched to achieve that volume to make extraction efficient and economically convenient
The term “transformation process” refers to the whole process to get stand transformed in row timber material and allocated in the landing, in order to be sold. This process includes all actions that should be done by
the forest owner, directly by it or indirectly through performance of forest consultant, as in majority of cases and
the logging company, who develops the technological cycle.
The starting point is the decision assumed by the forest owner to perform silvicultural intervention, while the end is when final monitoring of LCs’ activity is done and certification of the results is presented. This process is articulated in four steps, which are as follows:
Preliminary: aimed to acquire the permit for the silvicultural intervention to be executed.
Preparatory: which includes (a) the operations to transpose in the forest, the planning, and the administrative provisions; (b) the assignment of the work to an LC; and (c) the signing of the contract between FLO and LC.
Executive: in which LC performs silvicultural intervention. It includes selected trees felling, extraction, transportation, and stacking of the timber in the landing.
Conclusive: in which the goodness of the silvicultural intervention is verified.
In order to implement the four steps of the transformation process, many services and inputs must be purchased on the market. Total costs are the sum of three cost types (Table 10):
Transaction costs
Operative costs
Overhead costs
This type of cost includes all expenditures that have to be incurred in the process to fulfill the administrative procedures defined by rules, regulations, and laws, in order to manage the forest. Those expenditures are mainly necessary to acquire the permission to perform the silvicultural intervention, but they include the costs to prepare the forest area, to entrust LCs with the work, to ensure effectively results, and to monitor the results. The whole transaction costs are defined formally frame in which FCs and LCs must work in order to safeguard public interest as well as the forest and other social aspects (work safety aspect). Both FLOs and LCs sustain transaction costs.
\nFLOs’ transaction costs include the following:
Forest consultancy
Technical documents and drafts
Administrative fees
Selecting and entrusting an LC with implementation of forest utilization
Technical responsibility to safeguard the FLO’s interest during the activity
Verification of the forest utilization conformity to the standard defined by the permission and the forest rules, regulations, and laws
These costs per unit area usually decrease, but total cost increases according to the area interested in the process (proportional principle) (Figure 3). Expenditures for those performances are defined as bunched cost by
dedicated market survey;
negotiation between the LC and forest consultant;
tables issued by competent institutions. The amounts are changed proportionally with the volume of timber felled or with the forest area under management;
mixed approach, combining the two systems mentioned earlier; and
surveys on the dedicated market.
Transaction costs. Source: Our elaboration.
The LCs’ transaction costs are related to the obligations concerning the following:
Healthy costs, capital investment to ensure high safety standard in the forestry yards and to the forest workers
Cost of refund deposit, caution money that forest owners can operate when LCs don’t pay the stumpage price and for penalty that LCs incurred during the activities
The LC costs are defined by market survey.
\nAll expenditures to implement technological cycle are defined as operative cost (Table 11). These costs are sustained to transform trees into marketable timber products, mainly by the LC and only a few for FL. They include expenditure to buy primary and secondary productive factors.
\n\nType of costs | \nDescription | \n\n | Calculation | \nDetails | \n||
---|---|---|---|---|---|---|
Land | \nStructure | \nFixed costs | \nFee for recovery and storage of machines | \nQRR | \n\n\n | \nCC = building costs; cc% = recovery and storage coefficient; A = area | \n
Working capital | \nMachines | \nAmortization rate | \nAR | \n\n\n | \nMP = market price; RV = residual value; n = life time in years | \n|
Interest | \nInt | \n\n\n | \nQA = amortization rate | \n|||
Maintenance fee | \nMF | \n\n\n | \nQA = amortization rate; mc% = maintenance cost in percent | \n|||
Insurance and tax | \nI&T | \n\n\n | \nIns.ce = insurance; tax | \n|||
Costs of rapid consumption parts | \nCRCP | \n\n\n | \nK = cost of part; n = life time; MP = market price | \n|||
Other tools | \nFixed cost | \nFee for recovery and storage of machines | \nQRR | \n\n\n | \nCC = building costs; cc% = recovery and storage coefficient; A = area | \n|
Amortization rate | \nAR | \n\n\n | \nMP = market price; RV = residual value; n = life time in years | \n|||
Interest | \nInt | \n\n\n | \nQA = amortization rate | \n|||
Maintenance fee | \nQM | \n\n\n | \nQA = amortization rate; mc% = maintenance cost in percent | \n|||
Rapid consumption parts costs | \nCPRC | \n\n\n | \nK = cost of part; n = life time; MP = market price | \n|||
Material and energy | \nFuel and oil | \nVariable costs | \nFuel costs | \nFKCarb | \n\n\n or \n\n | \nKwh = power; μum = technical coefficient; csc = specific consumption; FK_MP = market price fuel costs; h = hours of use | \n
Oil costs | \nOKLub | \n\n\n or \n\n | \nKwh = power; μum = technical coefficient; Osc = specific consumption oil; OK_MP = market price fuel costs; h = hours of use | \n|||
Consumables | \nOther material costs | \nOMC | \n\n\n | \nQ = quantity; MP = market price | \n||
Labor | \nWorkers | \nSalary | \nS | \n\n\n | \nS = salary for hour; h = hours; i = qualification | \n|
Financial capital | \nFinancial | \nInterest on capital advanced | \nICA | \n\n\n | \nFC = financial capital; r = discount rate; t = time in days | \n|
Business organization | \n\n | Entrepreneur remuneration | \nER | \n\n\n | \nKT = total costs; j = different cost types | \n
Transformation cost types and calculation procedures.
The footnote symbol “*” means multiplication.
Main primary factors are as follows:
Land: capital permanently invested in the ground. While it is very relevant for FLOs, for LCs, it is limited to the structures for recovery and storage of working capital, as machineries, machines, and other tools.
Capitals that include the following:
Working capital such as machines (forwarder, harvester, chainsaw, etc.) and other tools (winch, etc.). Those have a multiple-year employment, so the use cost must be distributed through the years they will contribute to the activity (amortization costs and annual interest). These costs are added to the maintenance costs, insurance and other contribution, cost of rapid consumption parts, etc. in order to define the cost machine.
Financial capital necessary for the possession and use of working capital above descripted, to remunerate workers as well as to cover the interest of financial advances for the activity development.
Labor, concerning employers involved in the transformation process, such as forest workers and other units that have administrative functions. In both cases, the remuneration changes according to the skill and qualifications. The fundamental information is not the payment for hour or day, but the costs sustained by the entrepreneur that include tax, insurance, and other costs paid as benefits or facilities for the future of workers.
Entrepreneur organization, done by the person who assumes the forest activity risk. Currently, the payment is split between equity profit and extra profit. The first covers the responsibility assumed by the forest entrepreneur to manage the activity and it is estimated as about 10% of the total cost and named as equity net profit, while extra profit is obtained as differential between total costs (include equity profit) and total revenues. This amount covers the risk management activity.
Also named as indirect costs, these do not contribute directly to obtain the product but exist to ensure LC functioning. They are related to the LC unit as a whole, and they cannot be applied or traced to any specific unit of output. Overhead costs include the following:
Costs for managing goods and material purchases involved in the forest utilization process; costs due to the activity of timber trade in the market
Costs for managing of insurances, taxes, and other contributions due to the LC
Costs for managing markets and operator networks
Costs for the LC accounts
The output of the silvicultural activity can be expressed in terms of volume or value. The first results by measurement operations of the standing, with special emphasis to the volume of row timber material removal from the ground [V] differentiated for market destination [i] and expected to be sold in the polder (first competitive timber market). The latter is the result of the volume of row timber material for the relative market price [MP]. Data can be collected by market survey, or dedicated statistical publication.
\nFormally,
\nMain questions of forest management are:
What is the standing forest market price?
What is the timber forest products’ market price?
What is the forest management cost?
Literature offers three approaches to answer the questions above, which are as follows:
Market price approach
Cost approach
Combination of the above-mentioned approaches
In all these approaches, results are based on common comparative method. This method ensures a strictly direct or indirect connection between market and the good under evaluation.
\nTheoretical background on evaluation method has been defined from International Valuation Standard Council [21]. In this contest, two main approaches are suitable: market comparison approach and cost approach. The first obtains the timber value by comparing the timber under evaluation with other similar timbers sold in the market; for which, price and at least one technical parameter are well known. The latter defines the value considering all expenditures that the enterprise have to sustain in order to obtain the product under evaluation.
\nTimber evaluation can have different assessments depending on whether one of the following two objectives is pursued:
Timber optimization uses: FLOs’ target is to ensure the most appreciated market product.
Optimization of market functioning: FLOs target to create the most favorable conditions for large market participation by the LCs.
The first target tends to favor the major LCs, even if the LCs who would take part in the market are very few in number, at least only one. Those LCs are technologically advanced, have greater financial availability, and have wider timber markets, as they can be international timber markets. The hypothesis is that this setting should ensure an effective use of timber and that it can achieve the highest addend value. On the other hand, the second target tends to align itself with the most frequent conditions compared to the local area framework, so as to allow the greatest participation of the local LCs at the market. The hypothesis is that if a large number of LCs take part in the market, that should ensure highest LC competition and the highest stumpage price.
\nThe first step is to acquire an adequate observation numbers, at least not less than 4 for each variable used in model, of
market price (dependent variable);
technical variables (independent variables),
a) By direct comparison, using the fundamental proportion to evaluate a market good. Having market prices and at least one technical parameter value, the proportion adapted to evaluate forest stand marketable is
\nwhere [SV] is the stumpage price, [Vol] is the volume felled, [i] is the number of market observations collected by a survey, and [x] are the data related to the stand under evaluation. Developing the proportion above in favor of SV, it becomes
\nwhere the ratio in the square bracket is the stumpage value for cubic meter.
\nb) By indirect comparison, building an econometric model
\nwhere [Y] is the dependent variable vector of the stumpage price, [x] are the generic technical variables, and [i] is the type of variables such as forest area (hectares), timber volume (cubic meter), infrastructure index (qualitative data), and other parameters.
\nThe strong limits of both procedures are (a) the lower number of LCs that take the risk that low number of LCs have an informal agreement about the stumpage value, and the LC that acquire the stem it was decided before the timber market start officially; and (c) there isn’t a well structured culture on how and what forest data, technical and market, should be collected. Each forest owner has its collection, and each forest owner itself selects the variables that should be registered.
\nIt is the market in which the trees, transformed in marketable products, are sold as timber raw material. That market has two relevant advantages for the evaluation proceeding: (a) even if the number of FLOs or LCs that support the supply is very low, the sawmills are much more so the market should have less distortion; and (b) it is the first market later to the stand felling.
\nThe market price of timber raw material is obtained by market survey. Database is built using the price registered in the market.
\nThe production cost approach concerns the technological cycle step and it includes only the expenses necessary to carry it out. This circumstance mainly happens when forest management has social objectives or the timber raw material has high market value and the FLOs prefer it to be sold directly in the timber raw material market because they expect strong completion among sawmills. The FLOs operate on service markets. They purchase the LC services for felling, processing and transportation of plant to an area which is easy to access (landing). Timber raw material can be
evaluated to reduce forest management costs;
made available to the local community to pursue their objectives;
sold in the timber raw material, directly or through dedicated agencies.
FLOs have to pay the LCs in any case. Activity is developed within the regulation code of “tender” to fell stand. The characteristic of this entrust is that FLOs have to pay LCs for their performance. The main national law states that an enterprise, as LCs, “assumes, (…), the fulfilment of a work or a service towards a consideration in money”1.
\nProduction cost is formally obtained as
\nwhere [K] is the total costs, [k] is the elementary costs, [i] is the types of costs, [r] is the discount rate, and [t] time and [j, s] are, respectively, the day when the work finished and the day when the expenditure has been done.
\nThe last procedure provides the evaluation of the stand as a comparison between the value of the timber raw material market and all costs necessary to transform the stand into marketable products. The transformation process increases timber value step by step until it becomes timber raw material. The evaluation process, on the other hand, moves in the opposite direction: starting from the market products to achieve the stumpage value (Figure 4).
\nPathway of timber productions and value formation.
The fundamental relationship at the base of the procedure is that timber raw material market price is equal to the sum of stumpage price with the costs of carrying out transforming process:
\nwhere [MPRTM] is timber raw material market price in the first market after the stand is felled; [i] is the types of timber product obtained (timber construction, fuel wood, etc.); [SV] is the stumpage price; [KTot] is the total costs of transformation processes from stand to timber raw materials; and [j] is the types of costs. Resolving for the stumpage value, it becomes
\nThe ex ante budget is the tool that foresters usually adopt, where in one site is reported the revenue and in the other site the expenditures. The balance between revenues and expenditures is the stumpage value that LCs take from the commitment to pay at the FLOs when agreement was signed.
\nThe common model of this forest management is based on the ability of forest property (public or private) to carry out the forestry intervention. The owner directly or through an agency of the same subsidiary carries out forest utilization using personnel, machines, and tools in its possession. The economic and financial questions that accompany this approach are as follows:
What is the total cost of carrying out the intervention (Ktot)?
What is its operating cost (KOp)?
What is the market value of the timber raw material (MVTRM)?
The total cost expresses the total amount of costs regardless of the evidence that the resources used are internal. The operating cost focuses only on the variable (additional) costs that are incurred only if the intervention is carried out, ignoring the costs related to the internal resources involved in the works and the costs that the property still support. The last question relates to the value of timber raw material, which is quantified through market surveys.
\nIn this case, the silvicultural intervention is entrusted to an LC, which provides a service to the FLOs in exchange for payment of the service. The company that carries out the intervention is the one that, all other parameters being equal, ensures the service at the lowest price (Figure 5).
\nServices market: forest land owner purchase logging company service for felling, extraction, and processing timber production at lowest price. Source: Our elaboration.
Different approaches to calculate operating costs are reported in the cost machine literature. The main frames are elaborated and reported in Tables 12 and 13, respectively, for FAO and USDA. The following are the common comments:
Transaction and overhead costs are not included.
Labor costs are not included.
The frame proposed is developed for machine that works in huge areas or regions.
Total costs have to be used as an approximation of the cost machines.
Some algorithms and parameters used for evaluating cost are not easy to understanding the economic ratio.
\n | A | \nB | \nC | \nD | \nE | \nE formula | \nG | \n
---|---|---|---|---|---|---|---|
1 | \nTypes of data | \nDescription | \nRange | \nUnits | \nAmounts | \n\n | Sources | \n
2 | \nEconomic data | \nMarket price | \n\n | € | \n45,000.00 | \n\n | Market survey | \n
3 | \n\n | Percentuale di recupero | \n\n | % | \n10.00% | \n\n | Technical documents | \n
4 | \nValue at the end of the career | \n\n | € | \n4500.00 | \n=E2 × E3 | \nOur elaboration | \n|
5 | \nAnnual amortization | \n\n | € | \n4050.00 | \n=(E2 − E4)/E10 | \nOur elaboration | \n|
6 | \nMarket price tires | \n\n | € | \n2000.00 | \n\n | Market survey | \n|
7 | \nGasoline price | \n\n | €/l | \n1.12 | \n\n | Market survey | \n|
8 | \nDiscount rate | \n\n | % | \n3.00% | \n\n | Market survey | \n|
9 | \nAverage annual investment | \n\n | € | \n27,000.00 | \n=E2 × E18 | \n\n | |
10 | \nTechnical data | \nEconomic duration | \n\n | year | \n10.00 | \n\n | Technical documents | \n
11 | \n\n | Annual machine usage hours | \n\n | hours | \n1000.00 | \n\n | Technical documents | \n
12 | \nTechnical duration | \n\n | hours | \n10,000.00 | \n\n | Technical documents | \n|
13 | \nWork days in the year | \n\n | days | \n240.00 | \n\n | Technical documents | \n|
14 | \nWorking days in hours | \n\n | hours | \n4.20 | \n\n | Technical documents | \n|
15 | \nPower | \n\n | HP | \n80.00 | \n\n | Technical documents | \n|
16 | \nTires duration | \n\n | hours | \n3000.00 | \n\n | Technical documents | \n|
17 | \n\n | Gasoline consumption duration per hours | \n\n | l/hour | \n6.15 | \n=(E20 × E15 × E22)/E19 | \nOur elaboration | \n
18 | \nCoefficients and parameters | \nAverage annual investment coefficient | \n\n | % | \n60.00% | \n\n | Technical documents | \n
19 | \n\n | Tires coefficient | \n\n | \n | 1.20 | \n\n | Technical documents | \n
20 | \nGasoline conversion coefficient (1 l = 0.84 kg) | \n0.70–0.85 | \n\n | 0.84 | \n\n | Technical documents | \n|
21 | \nGasoline consumption | \n\n | \n | 0.17 | \n\n | Technical documents | \n|
22 | \nLubricants consumption | \n\n | % | \n10.00% | \n\n | Technical documents | \n|
23 | \nLoad factor | \n0.38–0.70 | \n\n | 0.38 | \n\n | Technical documents | \n|
24 | \nMaintenance coefficient | \n100–30% | \n% | \n100.00% | \n\n | Technical documents | \n|
25 | \nVariable expenditures coefficient | \n15–5% | \n% | \n7.00% | \n\n | Technical documents | \n|
26 | \nFixed costs | \nAnnual amortization per hour | \n\n | €/hours | \n4.05 | \n=E5/E11 | \nOur elaboration | \n
27 | \n\n | Interests per hours | \n\n | €/hours | \n0.81 | \n=E9 × E8/E11 | \nOur elaboration | \n
28 | \nVariable expenses | \n\n | €/hours | \n1.89 | \n=E9 × E24/E11 | \nOur elaboration | \n|
29 | \nTotal fixed costs | \n\n | €/hours | \n6.75 | \n=E25 + E26 + E27 | \nOur elaboration | \n|
30 | \nVariable costs | \nMaintenance and repair costs per hour | \n\n | €/hours | \n4.05 | \n=E5/E11 × E23 | \nOur elaboration | \n
31 | \n\n | Gasoline cost per hour | \n\n | €/hours | \n6.89 | \n=E17 × E7 | \nOur elaboration | \n
32 | \nLubricant cost per hour | \n\n | €/hours | \n0.69 | \n=E30 × E21 | \nOur elaboration | \n|
33 | \nTires cost per hour | \n\n | €/hours | \n0.80 | \n=E19 × E6/E16 | \nOur elaboration | \n|
34 | \nTotal variable costs | \n\n | €/hours | \n12.43 | \n=E29 + E30 + E31 + E32 | \nOur elaboration | \n|
35 | \nTotal costs | \nTotal machine costs | \n\n | €/hours | \n19.18 | \n=E28 + E33 | \nOur elaboration | \n
\n | A | \nB | \nC | \nD | \nE | \nE explosed | \nG | \n
---|---|---|---|---|---|---|---|
1 | \nTypes of data | \nDescription | \nRange | \nUnits | \nAmounts | \nFormulas | \nSources | \n
2 | \nEconomic data | \nMarket price | \n\n | € | \n45,000.00 | \n\n | Market survey | \n
3 | \nPercentuale di recupero | \n\n | % | \n10.00% | \n\n | Technical documents | \n|
4 | \nValue at the end of the career | \n\n | € | \n4500.00 | \n=E2 × E3 | \nOur elaboration | \n|
5 | \nAnnual amortization | \n\n | € | \n4050.00 | \n=(E2 − E4)/E11 | \nOur elaboration | \n|
6 | \nLabor cost | \n\n | €/hours | \n14.00 | \n\n | Market survey | \n|
7 | \nTire market price | \n\n | € | \n2000.00 | \n\n | Market survey | \n|
8 | \nGasoline price | \n\n | €/l | \n1.25 | \n\n | Market survey | \n|
9 | \nLubricant price | \n\n | €/l | \n2.25 | \n\n | Market survey | \n|
10 | \nDiscount rate | \n\n | % | \n3.00% | \n\n | Market survey | \n|
11 | \nTechnical data | \nEconomic duration | \n\n | year | \n10.00 | \n\n | Technical documents | \n
12 | \nAnnual machine usage hours | \n\n | hours | \n1000.00 | \n\n | Technical documents | \n|
13 | \nTechnical duration | \n\n | hours | \n10,000.00 | \n\n | Technical documents | \n|
14 | \nWork days in the year | \n\n | days | \n250.00 | \n\n | Technical documents | \n|
15 | \nWorking days | \n\n | hours | \n8.00 | \n\n | Technical documents | \n|
16 | \nHours machine usage effectively | \n\n | hours | \n4.20 | \n\n | Technical documents | \n|
17 | \nPower | \n\n | kW | \n60.00 | \n\n | Technical documents | \n|
18 | \nTire duration | \n\n | hours | \n3000.00 | \n\n | Technical documents | \n|
19 | \nCoefficients and parameters | \nGasoline conversion coefficient (1 L = 0.84 Kg) | \n0.70– 0.85 | \n\n | 0.84 | \n\n | Technical documents | \n
20 | \nOil conversion coefficient (1 L = 0.95 kg) | \n950– 850 | \n\n | 0.95 | \n\n | Technical documents | \n|
21 | \nGasoline specific consumption | \n280– 300 | \ng/kWh | \n300.00 | \n\n | Technical documents | \n|
22 | \nOil specific consumption | \n2–4 | \ng/kWh | \n4.00 | \n\n | Technical documents | \n|
23 | \n\n | \nUse coefficient of available power | \n95– 50% | \n% | \n66.67% | \n\n | Technical documents | \n
24 | \nMaintenance and repair coefficient | \n0.10–0.13 | \n% | \n0.13 | \n\n | Technical documents | \n|
25 | \nVariable expenditures coefficient | \n2.5– 0.5% | \n% | \n2.50% | \n\n | Technical documents | \n|
26 | \nFixed costs | \nAnnual amortization per hour | \n\n | €/hours | \n4.05 | \n=E5/E12 | \nOur elaboration | \n
27 | \nInterests per hour | \n\n | €/hours | \n0.61 | \n=(((E2 − E4)/2) × E10)/E12 | \nOur elaboration | \n|
28 | \nVariable expenses | \n\n | €/hours | \n1.13 | \n=(E2 × E25)/E12 | \nOur elaboration | \n|
29 | \nTotal fixed costs | \n\n | €/hours | \n5.78 | \n=E26 + E27 + E28 | \nOur elaboration | \n|
30 | \nVariable costs | \nMaintenance and repair costs per hour | \n\n | €/hours | \n1.82 | \n=E6 × E24 | \nOur elaboration | \n
31 | \nGasoline cost per hour | \n\n | €/hours | \n9.38 | \n=1/E19 × (E21/1000) × E23 × (E16/E15) × E17 × E8 | \nOur elaboration | \n|
32 | \nOil cost per hour | \n\n | €/hours | \n0.30 | \n=1/E20 × (E22/1000) × E17 × (E16/E15)*E9 | \nOur elaboration | \n|
33 | \nTires cost per hour | \n\n | €/hours | \n0.67 | \n=E7/E18 | \nOur elaboration | \n|
34 | \nTotal variable costs per hours | \n\n | €/hours | \n12.16 | \n=E30 + E31 + E32 + E33 | \nOur elaboration | \n|
35 | \nTotal costs | \nTotal cost machines per hours | \n\n | €/hours | \n17.94 | \n=E29 + E34 | \nOur elaboration | \n
In the forest appraisals, the approach is to elaborate an ex ante budget of the silvicultural intervention including the expected costs to transform trees in marketable products and the expected revenue that should be obtained from the products sold.
\nThe differences between expected revenue and costs are the expected stumpage value of the trees that LCs should pay to the FLO to bay the stand, while only the amount of the expected costs is the price that FLO has to pay to the LC for the service of felling the stand. Stumpage price became the minimum price that FLO accepts to sell its stand. LCs that want to purchase it have to submit a proposal with a price higher than the minimum (Figure 6).
\nCommodities market: forest land owner sells its stand to the logging company that makes the highest price.
Growing awareness of the usefulness of forest ecosystems makes the operational cost significant as a component of the wider transformation cost. The latter includes both transaction costs in order to satisfy the provisions dictated by the legislative and regulatory forest and related forest disciplines, as well as the overhead costs that allow the correct functioning of the LCs.
\nApproaches introduced by international institutions lend themselves to an assessment, very approximate of the costs of managing uniform forests that cover large and flat areas. Their limits are given by concentrating on the component of operating costs, excluding overhead and transaction costs, as well as the introduction of simplifications in order to increase the territorial scale of application. They determine an underestimation of forest management costs [22].
\nA drawback instead overcomes the analytical approach, whose strong point is its adaptation to the context of intervention and to the specificities of the transformation cycle. This makes it possible to overcome the deformities that characterize forests, especially in the mountain areas, where it is possible to register a different stumpage value for two similar forests, close to each other and having the same productions. This approach also ensures transparency and traceability of the assessment process, as well as flexibility being able to be adapted to the different process for entrusting the management of the stand.
\nThis research was in part supported by the “Departments of Excellence—2018” Program of the Italian Ministry of Education, University and Research (Law 232/2016), financed. Department for Innovation in Biological, Agro-Food and Forest Systems (DIBAF)-University of Tuscia, Project “Landscape 4.0—Food, Well-being and Environment” and Department of Agriculture and Forest Science (DAFNE), University of Tuscia, Project (WP3).
\nIntechOpen celebrates Open Access academic research of women scientists: Call Opens on February 11, 2018 and closes on March 8th, 2018.
",metaTitle:'Call for Applications: "IntechOpen Women in Science 2018" Book Collection',metaDescription:"IntechOpen celebrates Open Access academic research of women scientists: Call Opens on February 11, 2018 and closes on March 8th, 2018.",metaKeywords:null,canonicalURL:"/page/women-in-science-book-collection-2018/",contentRaw:'[{"type":"htmlEditorComponent","content":"On February 9th, 2018, which marks the official celebration of UNESCO’s International Day of Women and Girls in Science, we have announced we are seeking contributors for the upcoming “IntechOpen Women in Science 2018” Book Collection. The program aims to support women scientists worldwide whose academic needs include quality assurance, peer-review, fast publishing, collaboration among complementary authors, immediate exposure, and post-publishing citations reporting.
\\n\\nAPPLYING FOR THE “INTECHOPEN WOMEN IN SCIENCE 2018” OPEN ACCESS BOOK COLLECTION
\\n\\nWomen scientists can apply for one book topic, either as an editor or with co-editors, for a publication of an OA book in any of the scientific categories that will be evaluated by The Women in Science Book Collection Committee, led by IntechOpen’s Editorial Board. Submitted proposals will be sent to designated members of the IntechOpen Editorial Advisory Board who will evaluate proposals based on the following parameters: the proposal’s originality, the topic’s relation to recent trends in the corresponding scientific field, and significance to the scientific community.
\\n\\nThe submissions are now closed. All applicants will be notified on the results in due time. Thank you for participating!
\\n"}]'},components:[{type:"htmlEditorComponent",content:"On February 9th, 2018, which marks the official celebration of UNESCO’s International Day of Women and Girls in Science, we have announced we are seeking contributors for the upcoming “IntechOpen Women in Science 2018” Book Collection. The program aims to support women scientists worldwide whose academic needs include quality assurance, peer-review, fast publishing, collaboration among complementary authors, immediate exposure, and post-publishing citations reporting.
\n\nAPPLYING FOR THE “INTECHOPEN WOMEN IN SCIENCE 2018” OPEN ACCESS BOOK COLLECTION
\n\nWomen scientists can apply for one book topic, either as an editor or with co-editors, for a publication of an OA book in any of the scientific categories that will be evaluated by The Women in Science Book Collection Committee, led by IntechOpen’s Editorial Board. Submitted proposals will be sent to designated members of the IntechOpen Editorial Advisory Board who will evaluate proposals based on the following parameters: the proposal’s originality, the topic’s relation to recent trends in the corresponding scientific field, and significance to the scientific community.
\n\nThe submissions are now closed. All applicants will be notified on the results in due time. Thank you for participating!
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