百年柿树经济系数模型研建及应用

摘要

In this study,over 100-year-old persimmons were used as the object of study. A wood analysis of stems was applied to estimate the biomass,and with the harvest records the relationships between different ages,D. B. H. ( Diameter at Breast Height) factors and biomass,fruit production and economic coefficient ( Ec) were investigated. Furthermore, the statistics software was applied to establish the regression models of persimmon biomass of individual tree,fruit production and Ec. The results were as follows:1) with year as the unit,the relationship between EC1(the ratio of annual production of fruit and the cumulative biomass) and tree age and D. B. H. was all featured by hyperbola. 2) with a life cycle as the unit,EC3 ( the ratio of the cumulative amount of fruit production and cumulative biomass) tended to be stable, with the value of 0. 846 and the standard deviation of 0. 036. 3) thus,Ec plays the significant role in biomass estimation and study of economic forests and should give full attention.%以百年柿树为对象，利用树干解析的生物量及采果记录，研究不同树龄、胸径因子与生物量、产果量及经济系数之间的关系，建立柿树单木生物量、产果量与经济系数的回归模型。结果表明：以年为单位的 EC1(年产果量与累计生物量之比)与树龄及胸径间分别呈双曲线关系；以一个生命周期为单位时，EC3(累计产果量与累计生物量之比)趋于稳定，其值为0.846，标准偏差为0.036。经济系数在经济林生物量估算及研究中有重要作用，应给于充分的重视。