TRAFFIC, a strategic alliance of WWF and IUCN, the International Union for the .. Find out Few Benefits of Liver Detox Diet The liver works as the human physique’s pure filtering system, processing Lei federal The forest legislation can be understood as a set of laws governing the relations supervisory actions of the body, led to publication of the Law 11,/ of , e , de 22 de dezembro de ; revoga as Leis nos , de
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However, illegal and unplanned logging is exhausting forests rapidly. Second, it can be used to estimate the revenues that can be generated from concessions and the taxes that can be collected by government through a nondistortionary royalty mechanism. In our study, we consider community use and biodiversity conservation as possible alternative uses.
Second, we draw upon harvest scheduling and tactical planning problems, such as the optimization of infrastructure e. The model can be used to investigate the impacts of concessions from public forests on the local demand and supply for timber in a given region. The parameter is assigned a priori to be either binary 0, 1 or some other score assigned by the public planner, in the case the planner has 111284 about the relative value of different stands for a given land use alternative.
First, we draw upon the mathematical programming literature on the conservation reserve site selection problem, which generally aims llei conserve the maximum number of species at a minimum cost or using a minimum number of reserves [ 4 — 9 ].
Abstract Logging in natural forests is a vital economic activity in the Brazilian Amazon. However, we do permit the planner to specify the minimum number of stands allocated to each land use within the forest.
International Journal of Forestry Research
Next, we need to incorporate land uses other than timber concessions into the model. We then use the NPVs in the different scenarios simulated to determine the marginal opportunity arising from decreasing the area logged due to increasing requirements for alternative land uses. The software used in the analyses was GAMS We begin by establishing the basic selective logging timber supply problem, where the decision variables determine the amount of volume per ha to harvest.
In the first set of model runs that follow, we df assume that the spatial distribution of mills remains static. Developing this information is an important priority for public forests planning.
Lentini would like to thank D.
Lastly, as the Brazilian concession experience expands, more accurate estimates of concession establishment costs, transaction costs generated by the licensing of forest management plans, and audit costs will be available for the better accuracy of the model. This map was used to identify areas within the FSF with high potential in the first scenario simulated and to 5 in the second for biodiversity conservation. Some data and suggestions were also provided by L.
As well-planned and executed harvesting on public lands is intended to replace illegal logging on these lands, this capacity estimate is dee reasonable starting point for analysis until better data become available.
The Brazilian government estimates that up to 13 million ha of forest concessions could be established within the first 10 years of implementation of the Public Forest Management Oei PMFL. Table of Contents Alerts.
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The remaining profits are assumed to go to the government via a royalty mechanism that does not affect harvest decisionmaking. Currently, annual profits from logging represent one of the primary variables considered by the Brazilian Government in decisionmaking to grant concessions in public forests. The latter were assumed to be forests potentially being used by forest dwellers in their livelihood strategies in the first scenario simulated and or 3 in the second.
1284 To meet this end, we combine the best available spatially explicit data on expected logging profits, biodiversity, and potential for community use for use within a land use optimization model. The volume harvested is constrained by the available merchantable timber volume in the forest and the milling capacity of the logging centers surrounding the public forest.
The land use choice for each 0206 is represented by a series of binary variableswhich take on a value of one if a particular land use is chosen, zero otherwise. These studies created maps identifying forests financially profitable for logging, based on wood prices and logging costs i.
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Figure 6 b shows the same results for areas assigned to biodiversity conservation. However, as a result of diminishing returns from management effort for multiple activities within the same stand, landscape-scale multiple use planning is perhaps most efficient when each stand has a unique use [ 13 ]. NPV decreased with an le in the number of stands dedicated to communities.
In the case of community use, we assigned to stands in which older forest fires were identified — a weight equal to two-thirds the weight assigned to stands indicating more recent forest fire activity — equal to 2 and 3, resp. For this reason, the objective function maximizes profits while taking land use constraints into account. Fourth, at the landscape level, this model can help to determine the optimum level of timber production and 206 distribution of alternative land uses from public lands within a given region by taking into account future production trends of the logging industry.
Figures 5 c and 5 d show the frontier by applying differentiated weights for stands under these alternative uses, respectively, for community use and biodiversity conservation, using as a starting point the same NPV in the UL scenario.