基于GAM模型的洞庭湖叶绿素a浓度与环境因子相关性分析  

Analysis based on GAM model for the relationship between chlorophyll a concentration and environmental factors in Dongting Lake

作　　者：严广寒 殷雪妍 汪星[1,2,3] 王丽婧[3,4] 李丹[1,2] 田泽斌[1,2,3] 李虹[3,4] YAN Guang-han;YIN Xue-yan;WANG Xing;WANG Li-jing;LI Dan;TIAN Ze-bin;LI Hong(National Engineering Laboratory for Lake Pollution Control and Ecological Restoration,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;State Environmental Protection Key Laboratory of Drinking Water Source Protection,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu,Chinese Research Academy of Environmental Sciences,Yueyang 414000,China;Research Center of Ecological Environment for Yangtze River Economic Belt,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]中国环境科学研究院,湖泊水污染治理与生态修复技术国家工程实验室,北京100012 [2]中国环境科学研究院,国家环境保护饮用水水源地保护重点实验室,北京100012 [3]中国环境科学研究院,国家环境保护洞庭湖科学观测研究站,湖南岳阳414000 [4]中国环境科学研究院,长江经济带生态环境研究中心,北京100012

出　　处：《中国环境科学》2022年第1期313-322,共10页China Environmental Science

基　　金：中国环境科学研究院业务专项(2020-JY-009);三峡工程运行安全综合监测系统项目(2020年);三峡后续工作项目(2017HXXY-05)。

摘　　要：为了解洞庭湖流域水体叶绿素a的时空分布及其与环境因子的关系,于2019年1~12月对洞庭湖进行采样调查分析,运用广义可加模型(GAM)分析了叶绿素a浓度与各环境因子间的关系.结果显示,洞庭湖水体叶绿素a浓度存在较为显著的时空分布差异,其年均值为5.77μg/L,变化范围为1.00~67.33μg/L.叶绿素a浓度变化的单因素GAM模型中,不同季节环境因子对叶绿素a浓度变化影响解释率较高的单一因素有所不同,春季为高锰酸盐指数(COD_(Mn))、电导率(Cond)和总磷(TP);夏秋季为COD_(Mn)、水温(WT)和电导率;冬季为氨氮(NH_(4)^(+)-N)、电导率.叶绿素a浓度变化的多因素GAM模型中,对叶绿素a浓度变化的总体解释率为97.5%,解释效果较好.影响叶绿素a浓度变化的环境因子排序为COD_(Mn)>TP>电导率>NH_(4)^(+)-N>TN/TP,均与叶绿素a浓度呈非线性相关.From January to December in 2019,the samples were collected in Dongting Lake to analyze the correlation between the chlorophyll a distribution and concentration with environmental factors by using the generalized additive model(GAM).The results showed the strong temporal and spatial variations of chlorophyll a concentration appeared,annual average value was 5.77μg/L ranging from 1.00 to 67.33μg/L for the single influencing factor GAM model.The most influential factors in the variations of chlorophyll a concentration differed among seasons,with COD_(Mn),Cond and TP for spring;COD_(Mn),WT and Cond for summer and autumn respectively;NH_(4)^(+)-N and Cond for winter.For the multiple influencing factors GAM model the explanation result was better with an overall rate for 97.5%for the variations in chlorophyll a concentration.The environmental factors affecting the variations in chlorophyll a concentration ranked as COD_(Mn)>TP>Cond>NH_(4)^(+)-N>TN/TP,and all factors exhibited a non-linear relationship with chlorophyll a concentration.

关 键 词：洞庭湖 叶绿素A浓度 环境因子 GAM模型 相关性 

分 类 号：X524[环境科学与工程—环境工程]