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洱海表层沉积物溶解性有机氮生物有效性

赵亚丽 焦立新 王圣瑞 李艳平 黄丹 倪兆奎

赵亚丽, 焦立新, 王圣瑞, 李艳平, 黄丹, 倪兆奎. 洱海表层沉积物溶解性有机氮生物有效性[J]. 环境科学研究, 2013, 26(3): 262-268.
引用本文: 赵亚丽, 焦立新, 王圣瑞, 李艳平, 黄丹, 倪兆奎. 洱海表层沉积物溶解性有机氮生物有效性[J]. 环境科学研究, 2013, 26(3): 262-268.
ZHAO Ya-li, JIAO Li-xin, WANG Sheng-rui, LI Yan-ping, HUANG Dan, NI Zhao-kui. Bioavailability of Dissolved Organic Nitrogen in the Surface Sediments of Erhai Lake[J]. Research of Environmental Sciences, 2013, 26(3): 262-268.
Citation: ZHAO Ya-li, JIAO Li-xin, WANG Sheng-rui, LI Yan-ping, HUANG Dan, NI Zhao-kui. Bioavailability of Dissolved Organic Nitrogen in the Surface Sediments of Erhai Lake[J]. Research of Environmental Sciences, 2013, 26(3): 262-268.

洱海表层沉积物溶解性有机氮生物有效性

基金项目: 国家自然科学基金项目(U1202235,0);国家水体污染控制与治理科技重大专项(2012ZX07102-004)

Bioavailability of Dissolved Organic Nitrogen in the Surface Sediments of Erhai Lake

  • 摘要: 选取9个洱海表层沉积物样品,提取了DON(溶解性有机氮)进行生物矿化培养,测定了培养过程中各形态氮含量,并运用三维荧光技术研究了DON结构变化. 结果表明:①洱海沉积物中w(DON)范围为43.52~214.71mg/kg,平均值为115.19mg/kg,DON主要由类蛋白和类腐殖质类物质构成,并且以类蛋白为主;②洱海沉积物中DON生物有效性为1.21%~72.77%,平均值为33.23%,生物可利用量平均值为50.22mg/kg;DON生物有效性空间差异明显,北部和南部较高,而中部较低;③洱海生物自身产生及形成的DON主要由类酪氨酸组成,其中有小部分类腐殖质可被生物利用,这是由于类色氨酸和类酪氨酸共存可提高DON类腐殖质生物有效性. 此外,w(DON)占w(TDN)(TDN为可溶性总氮)的比例是影响DON生物有效性的重要因素,w(DON)/w(TDN)越高,类腐殖质及类酪氨酸含量越低,沉积物中DON生物有效性越高. 可见,DON对湖泊富营养化有重要影响,控制洱海富营养化,不仅需要关注沉积物中的w(TN),也应关注w(DON)及DON组成特征.

     

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出版历程
  • 收稿日期:  2012-07-17
  • 修回日期:  2013-01-15
  • 刊出日期:  2013-03-25

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