尾叶桉人工林生物量和生产力的研究

BIOMASS PRODUCTION AND PRODUCTIVITY OF EUCALYPTUS UROPHYLLA

摘要:

按径级标准木法测定了尾叶桉(Eucalyptus urophylla)器官生物量,建立了林木器官干重(w)与胸径和树高(D²H)关系的相对生长方程,进而计算出尾叶桉林分的生物量和生产力.结果表明:东门林场10年生尾叶桉人工林平均生物量为144.85 t hm^-2,各器官生物量的大小序列为:干材(71.69%)＞根(14.21%)＞皮(7.99%)＞枝(4.71%)＞叶(1.40%)；尾叶桉林分的平均生产力为15.98 t hm^-2a^-1；由于生物量的径级效应,使林分生物量的径级分布与株数的径级分布出现显著的差异。

Abstract:

An investigation of stand biomass and productivity was undertaken of Eucalyptus urophylla planted at spacing of 2 mx3 m in 1990 on Dongmen State Forest Farm, Guangxi Province, China. Stands in 27 plots with 20 m x 24 m each were measured, and 9 individual sampling stands from each diameter class were chosen. Regression equations for predicting biomass production were developed using functional dependence of biomass in different plant components on D²H. Mean biomass production of 10-year-old single tree and