衡水湖湿地植被的种群生态位研究

在衡水湖5个样地对1个乔木群落以及4个草本群落开展生态位宽度和生态位重叠指数研究.其结果表明:广生态位型的5个植物种火炬树(Rhus typhina)、柽柳(Tamarix chinensis)、芦苇(Phragmites communies)、茵陈蒿(Artemisia capillaries)和碱蓬(Suaeda glauca)其生态位宽度比较大,BL和B(SW)i两个指数都是外来入侵种火炬树最大,当地土著种芦苇次之,这反映了以上物种的地位和作用;存在生态位重叠的物种对占75.6%,即各物种对资源的共享趋势比较明显;但衡水湖高度的异质化生境且最大生态位宽度种火炬树为外来入侵种,共同造成了当地宽生态位物种间生态位重叠值不高的特点.

Study on Niche Characteristics of Plant Populations in Hengshui Lake Wetland

This study focused on plant niche breadth index and niche overlap index in 5 sample sites （1 forest and 4 herbosa） of Hengsbuihu wetlands. The result shows that the niche breadths of five widespread species （Rhus typhina, Tamarix chinensis, Phragmites communies, Artemisia capillaries, and Suaeda glauca） are larger. The values of BL and B（SW） indicate that Rhus typhina is the biggest and Phragrnites communies is the second. The results show that both Rhus typhina and Phragmites communies are very important in Hengshui Lake wetland. The niche overlap rate of species is 75.6 %, indicating that the trend that different species share the same resource is obvious. But the habitats in Hengshui Lake wetland are highly heterogeneous, and Rhus typhina with the maximum niche breadth is an invasive plant. This has caused the low niche overlap value among wide niche species.