生态环境学报Issue(8)：1322-1328,7.
异质生境空心莲子草植物群落组成及物种多样性研究
Impacts of the invasion of Alternathera philoxeroides on species composition and diversity of heterogeneous habitat in Caohai wetland
摘要
Abstract
Impacts of the invasion of Alternanthera philoxeroides on heterogeneous habitat community species life forms, species composition, important value and species diversity in Caohai wetland were studied. The results showed that, ①The ratio of species life form was different in heterogeneous habitats. The composition ratio of hemicryptophyte, cryptophyte and therophyte in aquatic habitat is 56:38:6, while it is 43:36:21 in wet habitat. ②Species composition was significantly different in heterogeneous habitat. There were 9 families, 13 genera and 16 species in test plots, and 10 families, 19 genera and 23 species in random sites which were located in the aquatic habitat and had no invasion of Alternanthera philoxeroides; while there were 8 families, 14 genera and 14 species in test plots, but 10 families, 19 genera and 22 species in random sites in the wet habitat. After the invasion of Alternanthera philoxeroides in both habitats, the important value of species have changed greatly and the differences between them were larger. In addition, some native species decreased and even disappeared in test plots. The proportion of native species disappeared in aquatic habitat and wetland habitat was 30.44%, 36.36% respectively. ③Relationship between important value of Alternanthera philoxeroides and species diversity index, Shannon-wiener index and pielou index all showed a binomial function changes in both habitats. Simpson index and pielou index were all increased with the important value of Alternanthera philoxeroides and then decreased, shannon-wiener index were decreased and then increased in both habitats. Therefore, the invasion of Alternanthera philoxeroides had positive effect and negative effect on species diversity of native vegetation communities. The important value of 25.8 (in aquatic habitat) and 18.9 (in wet habitat)is a critical point of native plant species diversity decreased.关键词
空心莲子草入侵/异质生境/物种组成/物种多样性/草海湿地Key words
the invasion of Alternanthera philoxeroides/heterogeneous habitat/species composition/species diversity/Caohai wetland分类
农业科技引用本文复制引用
李安定,谢元贵,张建利,龙秀琴..异质生境空心莲子草植物群落组成及物种多样性研究[J].生态环境学报,2013,(8):1322-1328,7.基金项目
国家科技支撑计划课题项目(2011BAC02B0202；2011BAC02B0201)；黔科合外G字【2012】7032号 （2011BAC02B0202；2011BAC02B0201）
