湖北斧头湖湖滨湿地水田碎米荠群落的定量分析

QUANTITATIVE ANALYSES ON A SHORELINE WETLAND COMMUNITY, COM .C ARDAMINE LYRATA BUNGE IN FUTOUHU LAKE

本文对湖北武昌斧头湖湖滨湿地的一个常见群落──水田碎米荠群落（Ｃｏｍ，ＣａｒｄａｍｉｎｅｌｙｒａｔａＢｕｎｇｅ）进行了详细分析。群落中出现了１６种植物，它们的频率分布与Ｒａｕｎｋｉａｅｒ频率分布定律稍有差异。水田碎米荠和荇菜（Ｎｙｍｐｈｏｉｄｅｓｐｅｌｔａｔｕｍ，Ｏ．Ｋｕｎｔｚｅ）是群落的主要优势种。该群落垂直结构较为简单，大部分区域可区分出两个植被层。不同物种的分布反映了它们对微地形变化的适应。所有的主要常见种均表现出群聚分布的格局，结合分析揭示了一些植物在不同区组规模上的相关。

One of the common wetland communities,Com. Cardamine lyrata Bunge,inFutouhu Lake, Hubei was studied in this paper.Sixteen species were found in thecommunity,and their frequency distribution was somewhat different from Raunkiaer'sfrequency law. Cardamine lyrata,Nymphoides peltatum O. Kuntze Alopecurus ja-ponicus Steud,Eleocharis pellucisa Presl and E,yokoscensis Tang et Wang werethe main common species of the community.The vertical structure of the communitywas relatively simple with only two layers in most areas.The distributions of diff-erent species in the community exhidited adaptations to the changes in microtopogra-phy.All the main common species showed patterns of aggregated distribution. Co-rrelation analyses revealed the joint relationships between some species at differentblock sizes,which were explained by their different growth patterns.