生态环境学报2011，Vol.20Issue(8)：1295-1300,6.
洞庭湖湿地水环境变化趋势及成因分析
Analysis of change trend of water environment and cause in the Dongting Lake wetland
摘要
Abstract
Change trend of important parameters of water environment from 1991 to 2009 in the Dongting Lake wetland were analyzed using classical non-parameters statistical test method of Mann-Kendall. Results showed that conductivity, COD, BOD5, total nitrogen, total phosphorus and suspended particles increased significantly from 1991 to 2009; Chroma, E. Coli, nitrate nitrogen and ammonium nitrogen increased insignificantly; Dissolved oxygen decreased significantly; pH and transparency decreased insignificantly. So, we could conclude that water quality of the Dongting Lake wetland decreased gradually. Results also indicated that period and frequency of sudden changes of water parameters were different significantly. Sudden changes of other parameters were between two critical lines (p=0.05) except one sudden change of chroma between the two lines (p=0.05 and p=0.01, respectively). In sudden changes analysis, chroma and suspended particles changed most frequently, total nitrogen and total phosphorus were most steady, and other parameters were in the middle. According to the periods of sudden changes, we could conclude that water quality declined focusing on 1992-1998. In additional, factors that affected water environment of the Dongting Lake were also analyzed in this paper, indicating that pollution from industry, agriculture (chemical fertilizer, pesticide, aquiculture, fences of livestock and poultry) and from human life around "Four River" basin and Dongting Lake area were main factors that caused water environment to be worse.关键词
洞庭湖湿地/水环境/趋势分析/Mann-KendallKey words
Dongting Lake wetland/ water environment/ trend analysis/ Mann-Kendall分类
资源环境引用本文复制引用
李有志,刘芬,张灿明..洞庭湖湿地水环境变化趋势及成因分析[J].生态环境学报,2011,20(8):1295-1300,6.基金项目
国家林业局公益性行业科研专项(201104065) （201104065）
湖南省林业科学院青年创新基金项目 （）
