【摘要】 通过典型样地调查,对永寿县不同因子影响的刺槐人工林下灌木层和草本层的物种丰富度、多样性指数和均匀度指数进行了比较分析,结果表明:不同林龄刺槐林下植物的Simpson指数、Shannon-Wiener指数和均匀度指数随年龄增大而降低,变化趋势是12 a生>17 a生>24 a生。当密度为1 000株.hm-2时,物种丰富度、Simpson指数和Shannon-Wiener指数最高。更多还原

【Abstract】 Through typical plots investigation,indices of species diversity,richness,and evenness of the shrub layers and the herb layers of the Robinia pseudoacacia in Yongshou County,Shaanxi Province,China were examined.The results showed that the indices of species diversity,richness,and evenness were all the highest in the middle-age forests.R.pseudoacacia plantation with a density of 1 000(plant/hm2) had higher species diversity and the most obvious changes of Shannon-Wiener index.Therefore,it is necessary to thinning rationally by appropriate measures.It is significant to the sustainable management of the whole plantation ecosystem.更多还原