| 156 m蓄水后三峡水库小江回水区春季浮游植物调查及多样性评价 |
| 摘要点击 4420 全文点击 2483 投稿时间：2007-09-26 修订日期：2007-11-30 |
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| 中文关键词 三峡水库 小江回水区 春季 多样性指数 丰富度指数 均匀度指数 |
| 英文关键词 Three Gorges Reservoir backwater area of Xiaojiang River spring diversity index richness index evenness index |
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| 中文摘要 |
| 三峡水库于2006年10月底蓄水至156 m水位，标志着三峡工程顺利进入初期运行阶段.为了解新的水位高程下小江回水区水环境的现状以及浮游植物种群结构的变化，于2007年初开始对该区域的富营养化水平进行了跟踪观测.以2007年春季（4月）的2次常规监测数据为基础，应用多样性指数H、丰富度指数d、均匀性指数J，对小江回水区的5个监测断面进行了多样性评价并分析了小江回水区浮游植物种群结构的变化趋势.结果表明，各监测断面的H、d和J 值分别为1.097 5～1.865 5、 1.324 2～1.860 4、 0.263 2～0.435 9； 各监测断面的营养水平均为中度富营养型，其中渠马断面水质最差，黄石断面水质最好.浮游植物细胞密度和生物量最大值出现在2007-04-08的渠马断面，分别达到了8.442×105 cells/L和1.887 mg/L.小江回水区的藻类种群组成在这一时期也出现了明显的变化，从冬季的硅藻-绿藻为主的结构逐渐向初夏的绿藻-蓝藻为主的结构过渡. |
| 英文摘要 |
| The Water Level of Three Gorges Reservoir moved up to 156m at the end of October 2006, which represents Three Gorges Project had begun its primary operation period. In order to realize the actuality of water environment and the variation of phytoplankton community of the backwater area of Xiaojiang River, the author has been observing the nutrition level of the area regularly since the beginning of 2007. Based on the data of the routing monitoring in spring (April) 2007, the algal diversity of five sites on Backwater Area of Xiaojiang River was assessed by the diversity index H, richness index d and evenness index J. The values of H，d and J in sample sites are 1.097 5-1.865 5， 1.324 2-1.860 4， 0.263 2-0.435 9 on April. The trophic levels of the five sites are all meso-eutrophic. The water quality of Quma site is not quite right, and the best one is Huangshi site. The highest value of the cell densities and that of the biomass both appeared at Quma April 8th(8.442×105 cells/L, 1.887 mg/L). It shows the trend that the Chlorophta and Cyanophyta evolve into dominant taxa of the phytoplankton community in early summer instead of Bacillariophyta and Chlorophta in winter on backwater area of Xiaojiang River. |
