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滇池表层沉积物中氨氮的释放特征

邓伟明 徐晓梅 陈春瑜 何 佳 刘文斌 李 森

邓伟明, 徐晓梅, 陈春瑜, 何 佳, 刘文斌, 李 森. 滇池表层沉积物中氨氮的释放特征[J]. 环境科学研究, 2015, 28(4): 524-531.
引用本文: 邓伟明, 徐晓梅, 陈春瑜, 何 佳, 刘文斌, 李 森. 滇池表层沉积物中氨氮的释放特征[J]. 环境科学研究, 2015, 28(4): 524-531.
DENG Weiming, XU Xiaomei, CHEN Chunyu, HE Jia, LIU Wenbin, LI Sen. Study on Release Characteristics of Ammonium in the Surface Sediments of Dianchi Lake[J]. Research of Environmental Sciences, 2015, 28(4): 524-531.
Citation: DENG Weiming, XU Xiaomei, CHEN Chunyu, HE Jia, LIU Wenbin, LI Sen. Study on Release Characteristics of Ammonium in the Surface Sediments of Dianchi Lake[J]. Research of Environmental Sciences, 2015, 28(4): 524-531.

滇池表层沉积物中氨氮的释放特征

基金项目: 国家水体污染控制与治理科技重大专项(2012ZX07102)

Study on Release Characteristics of Ammonium in the Surface Sediments of Dianchi Lake

  • 摘要: 为研究滇池内源污染特征,于2013年在滇池全湖布设36个采样点,采集表层沉积物样品,并对沉积物中w(NH4+-N)的分布及NH4+-N释放动力学特征进行研究. 结果显示:滇池表层沉积物中w(NH4+-N)为155.8~667.8 mg/kg,平均值为333.7 mg/kg,湖心区域最高. 0~5 min内NH4+-N释放速率最大,可达到3.34~42.31 mg/(kg·min); 5 min后NH4+-N释放速率逐渐降低,并在120 min左右基本达到释放平衡. 沉积物中NH4+-N的释放潜能为17 147~34 163 mg/kg,NH4+-N释放量随着水土质量比的增加而增大;滇池大部分区域NH4+-N的释放潜能相对较高,特别是在草海北部以及外海盘龙江河口处. 滇池沉积物中NH4+-N释放速率、释放潜能均高于长江中下游湖泊沉积物;与同为高原湖泊的洱海相比,其沉积物中NH4+-N释放速率基本相当,但是NH4+-N释放潜能却远高于洱海,表明滇池表层沉积物中NH4+-N具有非常高的释放风险.

     

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