Alternanthera philoxeroides community in the eastern Tiaoxi River
Recently,Alternanthera philoxeroides,an invasive species,is found to distributed widly in eastern Tiaoxi River which is as an important source of drinking water in Hangzhou City.The widely distribution of A.philoxeroides will be result in the water ecological security.So it has an important significance to study the distribution of A.philoxeroides community in eastern Tiaoxi River,as well as to find the effect on local species' diversity.In this study,random sampling method was used.One 100 m2 sample plot at eight reaches of the eastern Tiaoxi River was designed,in which five 0.25 m2 quadrats were chose to as be sampling sites.The morphological characteristics and the associated communities of A.philoxeroides at eight reaches of the eastern Tiaoxi River,Zhejiang Province were studied,and the importance and influence on plant diversity at eight sites were analyzed using Simpson's diversity,Shannon-Wiener,and Pielou Evenness Indexes.Results showed that stem length varied from 41.85 to 62.83 cm,average distance between nodes varied from 4.00 to 6.28 cm,and average number of branches ranged from 6.35 to 82.00.At the Donghu Village site of Lin'an City,the highest important value was 56.09％ with the least number (two) of associated species.However,there was no significant relevance between the importance value of A.philoxeroides and the species number of associated species (P ＞0.05).Nevertheless,there were significantly correlations between the associated species number and three diversity indexes (Simpson's diversity,,Shannon-Wiener indexes,and Pielou Evenness Index) (P＜0.05).Our results indicate A.philoxeroides has affected the local plant species diversity of the eastern Tiaoxi River.And the water ecological security of east Tiaoxi River is being threated by invasive species A.philoxeroides.
botanyAlternanthera philoxeroidesinvasionbiological diversityeastern Tiaoxi River
国家科技期刊平台
NSTL
万方数据
维普
