安太堡矿区植被恢复过程主要种生态位梯度变化研究

A study on gradual change of the dominant species' niche in theprocess of vegetation restoration of Antaibao mine

通过生态位宽度与生态位重叠指数 ,结合 TWINSPAN分类与 DCA排序 ,研究植被恢复过程中优势种生态位的梯度变化 ,以及这些种在不同群落类型中的地位、各群落之间的关系 .结果表明 :TWINSPAN结合 DCA对生态位宽度进行分析 ,可以很好地反应种的生态位梯度和以这些种为优势种的群落的结构梯度和环境梯度 ,同时还可以看出光因子和水分是决定优势种生态位梯度变化的主要因子 .各优势种的生态位在不同群落中又随种类组成的变化而变化 ,这种变化反映了森林群落的植被恢复效果最好 ,灌丛群落植被恢复效果普遍好于草地群落 。

By using the niche breadth,niche overlap,and TWINSPAN,DCA,The gradual change of the dominant species' niche in the process of vegetation restoration,the role of the dominant species in communities and the relationships of communities have been studied.The results are as follows:the result of DCA and TWINSPAN reflects the niche grade of the dominant species,the structure grade of and the environmental grade of communities.The decisive factors affecting the gradual change of the niche are light and water.The conditions related to niche of dominant species vary with community composition.The model of forest is the best model,the model of shrub is better than the model of herbage.For example the model of Robinia pseudoacacia-Pinus tabulaeformis is the best one.