生态环境学报Issue(4)：649-656,8.
漓江桂林市区段夏季浮游植物群落特征与水质评价
Phytoplankton community and water quality in guilin city section of Lijiang River in summer, China
摘要
Abstract
Phytoplankton plays a crucial role for primary productivity in aquatic ecosystems. The changes in community structure are related to the environmental conditions of water and directly affect the function of aquatic ecosystems; it is one of the important indicating factors of the quality of the water environment. In order to reveal the relationship between the structure of the phytoplankton community and the water quality of Lijiang River, the physical and chemical indicators and Phytoplankton community characteristics in the Guilin city section of Lijiang River (from Zhaojiaqiao village to Wangjia village) were investigated in August, 2012. The results showed that the contents of permanganate index (CODMn), total nitrogen (TN), total phosphorus (TP), ammonia (NH4+-N) were from 1.80 to 6.20, 1.12 to 2.68, 0.022 to 0.282 and 0.34 to 1.73 mg·L-1, respectively, which smoothly changed in the upstream and significantly increased in tributaries. A total of 128 species which belong to 60 genera of 7 phyla were identified in Lijiang River, including 50 species of Bacillariophyta (39.06%), 52 species of Chlorophyta (40.63%), 16 species of Cyanophyta (12.5%), 7 species of Euglenophyta (5.47%), 1 species of Pyrrophyta (0.78%), 1 species of Chrysophyta (0.78%) and 1 species of Xanthophyta (0.78%). The dominant species were S. tephanodiscus,C. pyrenoidosa, N.rhynchocephal, N.exigua,C.Bodanica,S.quadricandaandS. ulna. The cell abundance of phytoplankton ranged from 10.3×104 to 1047.0×104 ind.·L-1 and the average cell abundance was 474.7×104 ind.·L-1, which was the smallest in Zhaojiaqiao village and the largest in Nanxihe entrance; green algae was major on species and diatom was major on cell abundance and distribution of dominant species. Thus, Lijiang River could be classified as the diatom-green algae river. Shannon-Wiener and Simpson indexes of phytoplankton were from 1.60 to 4.27 and 2.24 to 12.74, indicating that the water quality of Lijiang River was cleaning-light pollution. Margalef and Pielouin indexes were from 1.85 to 4.23 and 0.40 to 0.83, indicating that the plankton community structures of this river were stable and unsusceptible to the outside interference. However, the biodiversity index was drastically reduced, the number of phytoplankton species was decreased, and the stain species bloomed in the tributaries, suggesting that the tributaries area was polluted. On the whole, the water quality of Lijiang River wasⅡ-Ⅲ water bodies, but tributaries were seriously contaminated. Therefore, in order to avoid the deterioration of water quality, it is necessary to increase control on non-point source pollution and strengthen monitoring on phytoplankton community structure in the downstream section of the Guilin.关键词
漓江/浮游植物/多样性指数/水质评价Key words
Lijiang River/phytoplankton/diversity index/water quality assessment分类
资源环境引用本文复制引用
周振明,陈朝述,刘可慧,李俊,陈孟林,蒋瑜,于方明..漓江桂林市区段夏季浮游植物群落特征与水质评价[J].生态环境学报,2014,(4):649-656,8.基金项目
国家自然科学基金项目(41161057）；广西科学研究与技术开发项目重大专项计划（桂科重1298002-6）；广西教育厅项目(201106LX078 （）
2013HZ003 （）
2013LX026 （）
2013LX027) （）
