Preliminary Investigation on Diversity and Distribution of Submerged Macrophytes in Hechi Area of Guangxi

Submerged macrophytes play important functional role in maintaining the stability and integrity of aquatic ecosystem.However,the diversity and distribution of submerged macrophytes decreased seriously under the strong human activities.In order to know the variation of submerged macrophytes in aquatic environment,some aquatic bodies in Hechi area of Guangxi were investigated and sampled in 2006.The Braun-Blanquet abundance/dominance(AD) scores and Shannon-Wiener species multiple indices were calculated from the data of field works.12 species of submerged macrophytes which belong to 7 genuses in 5 families were found in Hechi area.The dominant species included Vallisneria natans,Hydrilla verticillata,Potamogeton crispus and Potamogeton oxyphyllu.19 submerged macrophyte communities were cataloged according to dominant species and their composition ratios.