In order to master the ability of self -rehabilitation of the vegetation and the grow th regulations of three artificial forests (Eucalyptus ,Pinus massoniana and Castanopsis hystrix ) under the impact of human activity ,the article sets up the fixed monitoring stations in Cangw u county Gongqing forest farm to analyze the plant diversity and dynamic state of the three artificial forests'community from the aspects of plant species richness , evenness and species diversity index .The results are as follow :① From 2010 to 2012 ,the number of auxiliary species in three artificial forests displays a rising -and-then -falling trend according to the increase of canopy density ,w hile the herbaceous layer displays an increasing trend .②The variation trend of total number of individual plants ,plant species richness ,evenness and species diversity index of three communities is almost the same ,namely a rising -and-then-falling trend .The order of indexes in different forests is Castanopsis hystrix> Pinus massoniana > Eucalyptus;③For species diversity in vertical structure ,plant richness index and diversity index of three artificial forests show that index of shrub layer is higher than that of herbaceous layer .%为掌握桉树、马尾松、红锥3种人工林在人为活动影响下植被恢复能力及生长规律，在广西苍梧县共青林场设置了固定监测样地，从物种丰富度、均匀度和物种多样性指数等方面对这3种人工林群落的物种多样性及动态进行了研究。结果表明：①在2010～2012年间，3种人工林的林下灌木层种类数随着郁闭度的增大，呈先增后减趋势，草本层则呈现持续递增趋势；②3个群落的植物总个体数、物种丰富度、均匀度和物种多样性指数变化趋势均基本一致，即：先增加后降低，不同林分的各指标大小排序为：红锥林＞马尾松林＞桉树林；③垂直结构物种多样性方面，3种人工林植物丰富度指数和多样性指数高低表现为：灌木层＞草本层。
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