摘要
蚌湖是鄱阳湖的一个边缘湖泊,每年丰枯水位变化较大,研究蚌湖涨水前后湖水主要离子的变化及其来源分析对鄱阳湖的水环境保护有重要意义。分别采集4月(涨水前)和5月(涨水后)的水样,分析其中的主要阴阳离子及NH_4^+和NO_3^-浓度变化特征,并运用阴阳离子三角图和^(15)N同位素的方法分析它们的来源。结果显示,蚌湖涨水前后主要阴阳离子都是HCO_3^-,Ca^(2+)和Na^+,主要受碳酸盐岩的控制,涨水前离子浓度较高,涨水后大量河水输入湖泊,离子浓度与相邻河流的离子浓度相近。蚌湖NH_4^+和NO_3^-的浓度和^(15)N同位素值在涨水前后差异较大,显示涨水前氮污染主要来自于湖泊内部的氨化和硝化作用,涨水后主要来自于径流带来的农业、生活和养殖废水的混合污染。湖泊的水化学离子特征对于水环境条件的变化有较好的响应。
The changes of water level fluctuation are very great each year in Bang Lake,the edge lake of Poyang Lake. There is important significance to water environmental protection of Poyang Lake by analysis of ions concentration and its sources before and after water level rise in Bang Lake. Water samples were collected and the concentrations of its main cation,anion,NH4＋and NO3-were detected before and after water level rise（ April and May） in 2013. The sources of these ions were distinguished using the methods of triangular charts of cation-anion and of 15N stable isotopes. The results showed that main anions and cations are HCO3-,Ca^2＋ and Na＋before and after water level rise,which are mainly controlled by carbonatite in watershed. The ions concentrations are high before water level rise. There are similar ion concentrations between lake and rivers after water level rise due to the large amounts of rivers water input to lake. The concentrations and ^15 N isotope values of NH4^＋ or NO3^- had large difference before and after water level rise,which showed nitrogen pollution mainly come from ammonification and nitrification in internal lake before water level rise,and from agriculture,domestic and/or swine sewage with runoff after water level rise in Bang Lake. The water chemical ions characteristics have a good response to the change of water environment in lake.
作者
梁越
肖化云
LIANG Yue;XIAO Hua-yun(Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution,East China University of Technology,Nanchang 330013,China;School of Water Resources ＆ Environmental Engineering,East China University of Technology,Nanchang 330013,China)
出处
《东华理工大学学报（自然科学版）》
CAS
2018年第2期169-174,共6页
Journal of East China University of Technology(Natural Science)
基金
国家自然科学基金项目(41563001)
关键词
主要离子
变化特征
来源
涨水前后
蚌湖
main ions
change characteristic
source
before and after water level rise
Bang Lake
