邻体干扰推广模型及其在林草生态系统的应用

An Improved Model of Neighbourhood Interference and Its Applicaton in Forest_herb Ecosystem

在对邻体干扰指数模型进行推广的基础上，将其应用于分析林草生态系统（杜仲—三叶草、杜仲—黑麦草、杜仲—蒿类）中杜仲生长速度与草本植物邻体干扰强度的定量关系。结果表明，三叶草对杜仲生长的干扰属正效应，而黑麦草、蒿类为负效应；其干扰强度与草本植物数量性状（如盖度、生物量、高度）成正比；依据干扰强度所建立的效应模型可以解释杜仲新梢生长量变异的２５％～７０％，并能够反映草本植物对杜仲生长的干扰及其种内的自疏规律。

Forest_herb ecosystem, Eucommia ulmoides intercropping with Trifolium pratense and T. repense, E. ulmoides intercropping with Lolium perene, E. ulmoides and Artemisia spp. mixed community, was investigated and the relationship between height growth rate of tree individual and interference intensity of neighbourhood herbs was analysed by using the improved model of neighbourhood interference. The results showed that: 1. Trifolium spp. increased the growth rate of E. ulmoides (positive effect), while L. perene and Artemisia spp. reduced the growth rate of E. ulmoides (negative effect); 2.interference intensity was in proportion to quantitative characters, such as coverage, weight of biomass and height of herbs, and in inverse proportion to the size of subject tree when the effect of neighbourhood interference was negative, and in proportion to the size of subject tree when the effect was positive; 3.the effect models of neighbourhood interference accounted for 25%70% of the variation in the height growth rate of E. ulmoides, and indicated the dynamic rule of herbs interference with trees and intra_species thining of herbs.