摘要
本文以树干解析和二类调查资料为基础,选用 Chapman-Richards 函数,建立了8参数多型生长模型,根据生长与收获兼容性原理求得数量成熟龄;用贴现法求取净现值,并以净现值最大确定经济成熟龄,进行经济分析.依据工艺成熟为基限,经济成熟为重点,数量成熟作参考的原则确定了主伐年龄.按所定的主伐年龄采伐比按现行的主伐年龄采伐,经济盈利率一般可提高3%～4%.
Based on the data of stem analysis and forest resource inventory,firstly,thepolymorphic growth model with 8 parameters was constructed by usingChapman-Richards model;and the age of quantitative maturity was determined based onthe compatible principle of growth and yield.Secondly,the net present value was calculatedwith discount;the age of economical maturity was determined based on the principle ofNPV to maximum,and then the economical analysis was done.At last,the maturity age offinal felling of planted Chinese fir was determined on the basis of technical maturity as pre-scribed minimum,economical maturity as focal point,quantitative maturity as reference.By using this maturity age in final felling,the rate of economical profit may be increased 3～4% than using the maturity age of final felling used at present.
出处
《江西农业大学学报》
CAS
CSCD
1991年第4期336-343,共8页
Acta Agriculturae Universitatis Jiangxiensis
关键词
杉木
人工林
主伐年龄
经济成熟林
Chinese fir
Age of economical maturity
Maturity age of final felling
Polymorphic growth model
