广西河池沉水植物多样性及分布初步调查

对广西河池地区沉水植物进行了调查，利用布朗-布朗喀（Braun．Blanquet）的多度等级划分标准、Simpson物种多样性指数和Shan-non．Wiener物种多样性指数进行数据处理．共采集到沉水植物12种，隶属5科、7属．其优势种为苦草、黑藻、菹草、尖叶眼子菜．根据优势种及组成特征，将沉水植物群丛分为19个类型．群丛物种多样性指数最高的是黑藻＋苦草群落，其次是苦草＋黑藻＋狐尾藻＋菹草＋微赤眼子菜群落和菹草群落，以篦赤眼子菜指数最小．

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 vertieillata, Potamogeton crispus and Potamogeton oxyphyllu. 19 submerged macrophyte communities were cataloged according to dominant species and their composition ratios.