土壤物理性与林木生长关系的研究

STUDIES ON THE RELATIONSHIPS OF TREES GROWTH AND SOIL PHYSICAL PROPERTIES

本文应用多元回归、逐步回归方法,研究土壤物理性与林木生长的关系.研究认为相关显著,不同成土母岩发育的土壤,对林木生长的相关性和影响生长差异的主导因子不同.花岗岩发育的土壤主导因子是容重、非毛管孔隙度和腐殖质层厚度,砂岩发育的土壤主导因子是土层厚度,非毛管孔隙度和腐殖质层厚度.在湿润的南岭山地,林木生长对非毛管孔隙度的要求比总孔隙度的相关更显著,同时要求两者比例适宜.

With the method of multivariate regression and stepwise regression analysis,the rela-tionship of tree growth and soil physical properties were studies.The results are as follows:The relationships were significant.The soils developed from different parent rocks haddifferent influence on the growth of trees and their major effective factors were also various.The major factors of the soil developed from granite were volume weight,non-capillaryporosity and humus depth.The major factors of the soil developed from arenite weresoil-layer depth,non-capillary porosity and humus depth.In humid Nanling mountainarea,soil non-capillary porosity was more effective than total porosity on the growth oftrees,and proper proportion was demanded by the growth of the trees.