15年生桉树中大径材人工林生长规律与经济效益分析

Growth Regularity and Economic Benefit Analysis of 15-year-old Eucalyptus Plantation

通过树干解析法和净现值法对桂南地区15年生桉树人工林生长规律和经济效益进行了研究。结果表明,15年生桉树人工林平均胸径、树高和材积分别达到25.40cm(去皮)、29.7m和0.7321m^3/株;材积连年生长量在第14年达到最大值(0.0921m^3/a),第15年时材积生长仍未数量成熟;人工林经营累计净现值为97808.4元/hm^2,内部收益率为18.44%,年均利润为18474.15元/hm^2,年均利润率为33.66%,中大径材人工林经营效益可观,投资前景广阔。

The growth regularity and economic benefit of 15-year-old Eucalyptus plantation in southern Guangxi were studied by trunk analysis and net present value method.The results showed that the average DBH,tree height and timber volume of 15-year-old Eucalyptus plantation was 25.40 cm(barking),29.7 m and 0.732 1 m^3/plant,respectively.The annual volume growth reached its maximum value(0.092 1 m^3/a)in 14th year,and the volume growth not achieved the number of mature in 15 a.The cumulative net present value of plantation management was 97 808.4 yuan/hm^2,the internal rate of return was 18.44%,the average annual profit was 18 474.15 yuan/hm^2,and the average annual investment profit rate was 33.66%.The management benefit of middle and large diameter timber plantation was considerable and with a good investment prospect.