杭州西溪湿地灌草植被的排序和数量分类  

Quantitative Classification and Ordination of Shrub-grass Vegetation on Hangzhou's Xixi Wetland

作　　者：沈琪[1] 秦际威[1] 曹利仙[2] 

机构地区：[1]浙江外国语学院理工学院,浙江杭州310012 [2]嘉兴学院医学院,浙江嘉兴314001

出　　处：《浙江外国语学院学报》2011年第4期92-100,共9页Journal of Zhejiang International Studies University

摘　　要：杭州西溪湿地是在一千多年农渔耕作用下形成的城市边缘次生湿地.该项研究对西溪湿地自然生长的灌草植被进行了23个9m2的共优种样方和若干个单优种群落的调查,并尝试对它们进行DCA排序和TWINSPAN的聚类分类研究.结果显示,土壤水分和光照条件是影响西溪灌草植被群落及物种分布的主要因子.西溪的灌草植被大体上可以分为6大类,27个群丛:阳性-水生植物群落——9个群丛,阳性、近岸的湿生植物群落——8个群丛,介于湿生和中生之间的植物群落——3个群丛,以上三类是典型的湿地植被类型;阳性-中生植物群落——3个群丛,介于喜阳和耐阴之间的中生植物群落——2个群丛,耐阴的中生植物群落——2个群丛,后三类不是典型的湿地植被类型.TWINSPAN将99个物种分成两类:偏中生的和偏湿生的物种.DCA的排序与TWINSPAN聚类结果基本一致.最后指出,在保护现有生境和物种多样性的基础上,扩大和修复湿地生境,培植多样的湿地植物是杭州西溪湿地今后管理的重要任务.Xixi Wetland is located on the outskirts of Hangzhou, eastern China. It is a secondary farming wetland. The aim of this paper is to analyze the classification and distribution of the existing shrub-grass communities on Xixi Wetland by using TWINSPAN and DCA methods. Plant community surveys were conducted using random sampling technique. The important values （IV） of species were used. The results showed that the shrub-grass vegetation of Xixi can be classified as 27 associations according to their habitats, which are： heliophyte-hydrophyte communities （9 associations）; heliophyte-hygrophyte communities （8 associations） ; transitional communities between hygrophyte and mesophyte （3 associations） ; transitional communities between heliophyte and shade-tolerance （2 associations） ; shade-tolerance and mesophyte communities（2 associations）. Species in the vegetation were classified into two groups by TWINSPAN ： one group is hygrophyte, which are in favor of lowland; the other group is mesophyte, which appear more common on highland. TWINSPAN and DCA ordination both showed that soil moisture and light intensity are the most im- portant natural factors which determined the distribution of species and communities on Xixi. It is found that the coverage of typical wetland vegetation are less than that of the mesophytic ones, so it is suggested that much more wetland habitats and wetland plants should be restored or planted ; meanwhile, some degree of human management should be kept for the maintaining of multiple habitats, biodiversities and enhancing the ecological services of Xixi Wetland.

关 键 词：湿地 西溪 植被 群落组成 TWINSPAN DCA 

分 类 号：Q948[生物学—植物学]