退化草地恢复过程中不同种植密度人工柠条灌丛对植被的影响

The Effect of Artificially Planted Caragana -Pearshrub Density on Vegetation Characteristics in the Restoration Process of Degenerated Grassland

本文以宁夏东部干旱风沙区不同种植密度柠条灌丛草地为研究对象,系统研究了柠条灌丛草地恢复过程中植物群落的动态变化特征,比较了不同种植密度的人工柠条灌丛对退化草地植被恢复的影响.本研究在试验区共采集到种子植物32科77属83种,不同种植密度柠条灌丛草地中,植物物种数、群落盖度、群落物种多样性指数、生态优势度指数等变化趋势基本为:10m带距柠条灌丛>6m带距柠条灌丛>4m带距柠条灌丛.

The dynamic changes of vegetation characteristics were analyzed in restoring pearshrub（Caragana）-grassland planted in different plant-density in Eastern Ningxia, There collected 32 families, 77 genera, 83 species spermatophyte in test section. In pearshrub （Caragana）-grassland of different density,the basic change tendency of species diversity of plant community, coverage of plant communinty and plant biomass is： 10m bandwidth pearshrub （Caragana）-grassland 〉 6m bandwidth pearshrub （Caragana）-grassland 〉 4m bandwidth pearshrub （Caragana）-grassland, similar to homogeneity index change, and contrary to the ecological dominance change.