林業(yè)資源配置ppt課件-閱讀頁(yè)
2025-05-16 00:06本頁(yè)面
【正文】 都會(huì)至少降低一個(gè)企業(yè)或一種產(chǎn)品的產(chǎn)量 ,則這種生產(chǎn)資源的配置就是帕累托最優(yōu)狀態(tài)或最有效率的狀態(tài) . The main type of forest resource allocation a. Forest resource allocation among different department:( 部門配置 ) 三大基本生產(chǎn)部門 : department of forest management and forest resource exploitation(營(yíng)林業(yè)與森林資源開發(fā)部門 )。 department of forest product industry(林產(chǎn)工業(yè)部門 )。 regeneration period 0 10 20 30 40 50 10 20 30 40 50 30 10 20 40 50 輪伐期 A、 更新期 =0 此圖為采伐后及時(shí)更新，因此 v=0，輪伐期 u=50（年） B、 更新期 =10 輪伐期 30 10 20 40 50 0 10 10 20 30 40 50 60 10 20 30 40 50 60 此圖為伐后更新， v=10（年），則 u=60年 30 10 20 40 50 0 10 20 30 40 50 0 10 30 40 50 20 0 10 20 30 40 50 伐前更新 輪伐期 此圖為伐前更新， v = 10，則 u=40年， 這種情況常見于漸伐作業(yè)的采伐更新 So the task to calculate rotation is trying to find the age of maturation, the following are methods to calculate the age of economic maturation 2. Calculation methods of age of economic maturation Net profit of forest Average profit per unit area: iTCTRFR iii??In which: FRi: profit of forest at year I TRi: Total momentary revenue of clear cutting at year i TCi: Total cost of forest cultivation until year I i: age of forest Using the above equation to calculate the profit of forest for different year, the year which has the highest value will be the age of economic maturation. Then using this value together with regeneration period, the rotation can be calculated. The expected value of forest land 1)1()1(????ttee iiVLIn which: Le: Expected value of forest land Ve: Net present value form harvest i: interest rate t: harvest age The age which has the highest value will the age of maturation Present value (worth) ?? ???ntttt PCRP NW0 )1(1)(In which: PNW: present value Rt: moary revenue at year t Ct: moary cost at year t t: the year when the revenue and cost happened P: interest rate, or discount rate Internal rate of return ???? ???ntttnttt PCPR00 )1(1)1(1In which: Rt: moary revenue at year t Ct: moary cost at year t t: year P: the interest rate which hold the equation (IRR)
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