广西国有三门江林场桉树高产示范林培育与经济效益分析

High-yielding Culture and Economic Benefit of Eucalyptus Demonstration Forest in State-owned Sanmenjiang Forest Farm of Guangxi

对广西壮族自治区国有三门江林场营造的桉树高产示范林生长性状指标跟踪调查。结果表明,造林9个月后平均成活率为90.77%,20个月、34个月、43个月、57个月、66个月时的保存率均为90.77%;造林66个月平均树高、胸径、单株材积、单位面积蓄积分别为:22.66 m、14.10 cm、0.1894 m^3、248.01 m^3/hm^2,每年树高、胸径、单株材积、单位面积蓄积平均生长量分别为:4.12 m、2.56 cm、0.0344 m^3、45.09 m^3/hm^2。经财务评价指标动态分析:纯收入为150149.10元/hm^2,纯利润为96 813.56元/hm^2,年平均纯利润为15 079.99元/hm^2,30.17 hm^2桉树高产示范林净现值NPV为2 920 865.10元,单位面积净现值NPV为96 813.56元/hm^2,内部收益率IRR为42.39%,投入产出比为1∶3.92。

The growth traits of Eucalyptus high-yielding demonstration forest in State-owned Sanmenjiang Forest Farm of Guangxi were investigated.Results showed:after nine months of afforestation,the average survival rate was 90.767%,and after 20,34,43,57 and 66 months,the average preserving rate was 90.677%;after 66 months,the average height,DBH,volume per plant and volume per unit area were 22.66 m,14.10 cm,0.189 4 m^3 and 248.01 m^3\hm-2,respectively,and the average increment of height,DBH,volume per plant and volume per unit area every year were 4.12 m,2.56 cm,0.034 m^3 and45.09 m^3\hm^2,respectively.The dynamic analysis of financial evaluation index indicated:the net income was 150,149.10 yuan\hm-2,the net profit was 96,813.56 yuan\hm-2,the average net profit is 15,079.99 yuan\hm^2 per year,the net present value(NPV)of 30.17 hm^2 Eucalyptus high-yielding demonstration forest was 2,920,865.10 yuan,NPV per unit area was96,813.56 yuan\hm^2,the internal rate of return(IRR)was 42.39%,the input-output ratio was 1:3.92.