摘要
水体富营养化是我国湖泊面临的主要问题,分析叶绿素a含量的变化特征及其影响因素,能为湖泊水质评价提供可靠基础。以2017年7月草海丰水期水质数据为参考,对各监测点叶绿素a与环境因子(TN,TP,NH_3-N,COD_(Mn),DO,WT)进行相关性分析并预测叶绿素a的变化趋势。结果表明:草海丰水期叶绿素a的均值为8.07μg/L,处于中营养化状态;叶绿素a与TN,TP,NH_3-N,COD_(Mn)呈显著正相关,而与其他环境因子相关性不显著,表明营养盐对浮游植物影响程度最大;将spearman秩相关系数及多元线性回归方程计算的叶绿素a预测值与实测值进行相关性拟合,得到较好的相关性(R^2=0.85,P<0.01),表明该方法的预测结果能为预测草海叶绿素a变化趋势提供参考。草海上游及人类活动较大区域污染程度高,TP是草海藻类生长的限制因子,因此控制TP含量的输入是改善水质的关键。
The eutrophication of water body is a major problem faced by lakes in China. Analyzing the variation characteristics of chlorophyll a content and its influencing factors can provide a reliable basis for lake water quality assessment. In this paper,we use the water quality data at monitoring sites of Caohai Lake in July 2017 as a reference to study the correlation between chlorophyll a and environmental factors（ TN,TP,NH3-N,COD（Mn）,DO,WT） and predict the variation trend of chlorophyll a. The results show that the average value of chlorophyll a is 8. 07 μg/L in wet season of Caohai Lake,and it is in a medium eutrophication state. Chlorophyll a is significantly positively correlated with TN,TP,NH3-N,and COD（Mn）,but is not significantly correlated with other environmental factors,indicating the greatest influence factor on phytoplankton is nutritive salt; TN/TP average ratio is 18. 16 and the lake is in P restricting state; the fitting of predicted and measured chlorophyll a with multiple linear regression equation and spearman rank correlation coefficient obtains better correlation（ R2= 0. 85,P 〈0. 01）,indicating that this method can provide a reference for predicting the chlorophyll a variation trend in Caohai Lake. The pollution in upstream area of Caohai Lake and intensive human activities area is heavy and TP is a limiting factor for the growth of grass algae. Therefore,controlling TP input is the key to improving water quality.
作者
王之明
王堃
刘绥华
夏品华
宋善海
吴胜利
杨杰
WANG Zhiming;WANG Kun;LIU Suihua;XIA Pinghua;SONG Shanhai;WU Shengli;YANG Jie(Guizhou Provincial Environmental Monitoring Center Station,Guiyang 550081,China;School of Geography and Environmental Science,Guizhou Normal University,Guiyang 550001,China;Key Laboratory of Remote Sensing Applications of Mountain Resourees and Environment in Guizhou Province,Guiyang 550001,China;Guizhou Key Laboratory of Mountain Environmental Information System and Eco - environmental Protection,Guizhou Normal University,Guiyang 550001,China;Life Science Academy,Guizhou Normal University,Guiyang 550001,China)
出处
《人民长江》
北大核心
2018年第14期34-39,共6页
Yangtze River
基金
国家自然科学基金项目(61540072)
贵州省科学技术基金项目(黔科合J字[2014]2127)
贵州省重大科研专项课题(20163022-02)
贵州省科技联合基金项目(LH20167200)
关键词
叶绿素A
环境因子
相关分析
草海
Chlorophyll a
environmental factors
correlation analysis
Caohai Lake
