关键词: 灌丛群落, 灌丛群落, 种间关联, 重要值, X2检验, 衡阳盆地

Abstract: Zanthoxylum bungeanum（Mianjiao）Maxim. is one of main economical tree species cultivated in north central semi-arid region of Linxia. It is of practical significance to improve cultivation quality by carrying out plus tree selection of Z. bungeanum（Mianjiao）Maxim.. This article narrated the region, procedure and regulation of plus tree selection of Z. bungeanum（Mianjiao）Maxim. By analysing statistically 4 main factors such as tree, land, artificial factors and environment and so on and their 20 sub-factors of 72 primary selected trees, we identified score weight and different grades score. Through primary selection, re-selection and finally selection, we selected 6 superior trees and completed superior trees’investigation and work on building files and proposed the feasible approaches to use superior trees resources.