山西桑干河流域湿地植被优势种群生态位分析

应用Shannon-W iener指数和Petra itis的方法研究了山西桑干河流域湿地植被群落28个优势种群的生态位宽度和生态位普遍重叠及特定重叠,结果表明:堇菜(2.636 62)、柽柳(2.150 62)和水葱(2.009 65)的生态位宽度最大,这主要是由于它具有广泛的适应性,利用资源较充分,为群落的主要建群种,在创造群落内部独特环境中起重要作用;浮萍(0.858 68)、薄荷(0.568 81)、眼子菜(0.393 9)的生态位宽度最小,这主要是它们对资源的利用有较强的选择性,并对生态因子有特别的依赖性.28个优势种群之间不存在完全的普遍重叠,仅有水蓼与水葱、水蓼与草、水蓼与泽泻3个种对表现出完全的特定重叠.

Niche Characteristics of Dominant Populations of Wetland Vegetation in Sanggan River Watershed,Shanxi

The niche breadth and niche overlapping of 28 dominant species of Wetland vegetation in Sanggan River watershed,Shanxi were studied by using Shannon-Wiener's index and Petraitis's methods.The results indicated that the niche breadths of Viola verecunda(2.636 62),Tamarix chinensis(2.150 62) and Scirpus validus(2.009 65) were bigger than that of the others because these 3 species han extensive adaptation to environment and used resources fully,moreover,they were main constructive species for the communities and were the important roles on creating a specific environment within the communities.The niche breadths of Viola pekinensis(0.858 68) and Tamarix chinensis (0.568 81) and Scirpus tabernaemontani((0.393 9)) were the smallest because these 3 species had stricter selectivity to resources and needed some specific ecological factors,and they could survive in some specific communities.There was no general overlapping among all species,and only 3 paired-species,Polygonum hydropiper and Scirpus validus,P.hydropiper and S.triqueter,P.hydropiper and Alisma orientale had specific overlapping.