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《Research of Environmental Sciences》 2008-04
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Effects of Bellamya sp. on the Growth of Vallisneria atans in Lake Taihu

ZHENG You-fei~1,WEN Ming-zhang~1,LI Kuan-yi~2,WANG Hong-yan~1College of Environmental Science and Engineering,Nanjing University of Science Information & Technology,Nanjing 210044,China2.Nanjing Institute of Geography and Limnology,China Academy of Sciences, Nanjing 210008,China  
The effects of Bellamya sp.on Vallisneria atans was studied in the test base in Lake Taihu during Sept.to Oct.2006.Results showed that there was no obvious change in plant biomass in control treatment,otherwise,the plant biomass increased significantly in other treatments,and showed positive response to an increase of density of snails.The growth ratio of plant biomass in 20,40 and 80 snails treatment are 4.5,5.3 and 6.2 times higher than in control treatment respectively.Besides,rhizome biomass of Vallisneria atans in treatments with snails notably higher than that in treatment without snail,while it was reverse for the fibre.Contrarily,periphyton biomass in treatment with 20,40 and 80 snails were significantly lower 33.3%,54.8% and 53.7% than in treatment without snail.It can be concluded that when coexisting with submerged macrophytes,snails can promote both growth and reproduce of plants.So raising some Bellamya sp.in shallow lake will help to resume submerged aquatic vegetation.
【Fund】: 国家高技术研究发展计划(863)项目(2002AA601011);; 中国科学院知识创新战略行动项目(KZCXI-SW-12)
【CateGory Index】: Q948
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