山地-水域交错区的生境异质性与水生植物多样性的关系研究

DIVERSITY OF MACROPHYTES RELATIVE TO HETEROGENEITIES OF HABITATS IN MOUNTAINWATERS ECOTONE

根据依兰县地貌类型多样的特点，对牡丹江、倭肯河和巴兰河３个样条附属水域中水生植物多样性进行研究，结果表明：β－多样性在牡丹江为高，倭肯河最低；以不同阶元比较，种级β－多样性高于科级与属级。在３个样条中均以河流－平原间的样地中水生植物多样性为高。高海拔处多样性值较低，中低海拔处为高。不同生活型植物的α－多样性比较倭肯河略高，β－多样性以巴兰河和牡丹江略高。在河流上游植物多样性较低，中下游河段两侧发育着多样的异质环境，此间附属水体中植物多样性最高。从３条河流汇合处向上游，植物种类逐渐减少。

Based on the field studies in Yilan county in the Northwestern Sanjiang Plain,the diversity of plants in some waters of rivers Mudan,Weiken and Balan were measured.The results show:βdiversity is high in Mudan River,lower in Balan River and lowest in Weiken River.In the hierarchies of botanical classfication,the βdiversity of species level is higher than those of genus and family levels.The diversity is higher in riverplain ecotone than in others.The diversity is lower in the high elevation above and higher in the middle elevation.Among the αdiversity of plants belonging to four lifeform type,that of Weiken River is higher,while βdiversities were high in River Balan and Mudan.Water plant species was rich in the lower rivers,but not rich in the upper rivers.