浮游植物分析法解析御临河流域水环境质量现状

Discussion on the Present Situation of Water Quality in Yulin River Basin by Phytoplankton Analysis

御临河流域与长江(重庆段)流域水环境质量息息相关,为掌握御临河流域水环境质量时空现状采用浮游植物分析法,通过对浮游植物及水环境质量因子等的相关性分析,建立御临河流域时间和空间预警预报信息体系。统计分析发现:具尾逗隐藻、啮蚀隐藻为御临河流域的代表性种群;浮游植物总密度春季>冬季>夏季>秋季,G1-幺滩≥G2-黄印>G4-统景镇>G12-箭沱湾≥G5-长滩≈G8-御临镇,其中G5、G8断面春末夏初易超Ⅱ类水质;浮游植物优势种的更替与总磷、总氮有关;氮磷比春冬季高、夏季低,秋季适中,最适宜浮游植物生长;氨氮与浮游植物的变化趋势不太明显,但硝基氮、尿素和有机氮含量与浮游植物的变化显著负相关;透明度、水质五参数和浮游植物总密度明显正相关;御临河流域3~5月、9~10月叶绿素a大于10μg/L,是藻类爆发的高频时段;此外,御临河流域营养状态由春季中营养经夏季轻度富营养又回落至秋、冬季中营养的一个闭路循环。基于浮游植物分析法建立的水环境质量现状预警预报信息体系为御临河流域水环境质量管控重点提供了时空节点方面的科学依据。

The water environment quality of Yulin River Basin is closely related to that of the Yangtze River(Chongqing Section)basin.In order to master the temporal and spatial status of water environment quality in the Youlin River Basin,In order to master the temporal and spatial status of water environment quality in the Yulin River Basin,this paper adopted phytoplankton analysis and established the temporal and spatial warning and forecast information system of the Youlin River Basin based on the correlation analysis of Phytoplankton and water environmental quality factors.The results of statistical analysis showed that Cryptocystis caudata and Cryptocystis Erinaceus were the representative species in Yulin River Basin,the total density of phytoplankton in spring>Winter>summer>Autumn,G 1-a Beach≥G 2-huang Yin>G 4-tong Jing Zhen>G 12-jiantuo Bay≥G 5-chang Tan≈G 8-yu Lin Zhen,G5 and G8 sections were easy to exceed ClassⅡwater quality in late spring and early summer.The replacement of dominant species of phytoplankton was related to total phosphorus and total nitrogen.Nitrogen and phosphorus ratio was high in spring and winter,low in summer,moderate in autumn,which was most suitable for phytoplankton growth.The change trend of ammonia nitrogen and phytoplankton were not obvious,but the contents of nitro-nitrogen,urea and organic nitrogen were negatively correlated with the changes of phytoplankton.The five parameters of transparency,water quality and total phytoplankton density were positively correlated.Chlorophyll A is greater than 10μg/l in march-may and september-october in the Yulinhe River Basin,which are the high frequency periods of algae outbreaks.In addition,the nutrient state of Yulin River basin is a closed cycle from mid-nutrient in spring to mild eutrophication in summer to mid-nutrient in autumn and winter.The early warning and forecasting information system of water environment quality based on phytoplankton analysis method provides a scientific basis for water environment quality control in Yulin River Basin.