黄栌群落优势种群生态位研究

应用Shannon-W iener指数和P ianka重叠指数的方法,对山西中条山黄栌群落24个优势种群的生态位宽度和生态位重叠进行了研究。结果表明:黄栌和黄刺玫的生态位宽度最大,这直接反映了它们作为建群种在黄栌群落中的优势地位。黄栌和黄刺玫种间具有最大的重叠值,这是因为他们高居灌木层第一亚层,具有相似的资源利用方式,对光资源的需求较为强烈所致。黄栌与山蒿也有较大的重叠值,这是由于他们处于不同的亚层,皆为阳生植物,必然会在光资源利用方面存在竞争。灌木层植物间的重叠值大于草本层植物间的重叠,这是由于草本植物种间生态习性差异较大所致。

Niche Characteristics of Dominant Populations in Cotinus coggygria var.pubescens Communities, Shanxi

The niche breadth and niche overlapping of 24 dominant species in Cotinus coggygria var.pubescens communities in Zhongtiao Mountains,Shanxi were studied by using Shannon-Wiener's index and Pianka's index.The results indicated that the niche breadths of C.coggygria var.pubescens and Rosa xanthina were the biggest,which directly reflected their dominant positions as constructives in C.coggygria var.pubescens communities.The overlapping of C.coggygria var.pubescens and R.xanthina was the biggest among all of species,and the reason was that they were both in the first subshell of the shrub layer and they shared resources in the similar way which approved their occupation on sufficient natural resources.Moreover,the specific overlapping between C.coggygria var.pubescens and Artemisia branyliba was bigger than that on other pair-species because they occupied different sub-layer in the communities and were sun plants that resulted in competition for light resource.The overlapping among species in the shrub layers were more than that in the herb layer,it resulted from that there were more different ecological characteristics among the herbs.