土壤养分梯度下黄河三角洲湿地植物的生态位

NICHES OF WETLAND PLANT SPECIES IN THE YELLOW RIVER DELTA UNDER SOIL NUTRIENT GRADIENTS

利用Levins生态位宽度公式和Pianka生态位重叠公式,在土壤有机质、土壤总磷、土壤总氮3个养分梯度上分别对黄河三角洲湿地19个植物种的生态位宽度值和生态位重叠值进行了分析.结果表明:各植物种在3个养分梯度上的生态位宽度值差异不大,优势种柽柳(Tamarix chinensis)、盐地碱蓬(Suaeda salsa)、芦苇(Phragmites australis)的生态位宽度值均较大;植物种之间的生态位重叠一般均较小,说明植物种在土壤养分梯度上产生了生态位分化.

The niche breadths and overlaps of the 19 main wetland plant species under three soil nutrient gradients in the Yellow River delta of China were analyzed by using the formulae described by Levins and Pianka, respectively. The niche breadths of each plant species under these three gradients were generally the same, and the dominant plants Tamarix chinensis, Suaeda salsa, Phragmites australis had the widest niche breadths. Most of the niche overlaps between the 19 species were small under all these gradients, which indicated that niche differentiation happened under soil nutrient gradients.