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Seasonal variation of potential denitrification rates of surface sediment from Meiliang Bay, Taihu lake, china

Journal of environmental sciences 2010年第7期22卷 961-967页

作者： jicheng zhong, chengxin fan,{2.,{3., jingge shang, xiaozhi gustate key laboratory of lake science and environment, nanjing institute of Geography and Limnology, chinese academy of sciences, nanjing 210008, china. [a] State key laboratory of {2. {3. environment Nanjing Institute of Geography Limnology Chinese Academy of Sciences Nanjing 210008 China

The regulatory effects of environmental factors on denitrification were studied in the sediments of Meiliang Bay, Talhu lake, in a monthly sampling campaign over a one-year period. Denitrification rates were measured in slurries of field samples and enrichment experiments using the acetylene inhibition technique. Sediment denitrification rates in inner bay and outer bay ranged from 2.8 to 51.5 nmol N2.（g dw （dry weight）·hr） and from 1.5 to 81.1 nmol N2.（g dw·hr）, respectively. Sediment denitrification rates were greatest in the spring and lowest in the summer and early autumn, due primarily to seasonal differences in nitrate concentration and water temperature. For each site, positive and linear relationships were regularly observed between denitrification rate and water column nitrate concentration. Of various environmental factors on denitrification that we assessed, nitrate was determined to be the key factor limiting denitrification rates in the sediments of Meiliang Bay. In addition, at the two sites denitrification rates were also regulated by temperature. The addition of organic substrates had no significant effect on denitrification rate, indicating that sediment denitrification was not limited by organic carbon availability in the sediments. Nitrate in the water column was depleted during summer and early autumn, and this suppressed effective removal of nitrogen from Taihu lake by denitrification.

关键词： denitrification sediment environmental factors Taihu lake

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湖泊污染底泥治理修复实践--以太湖为例

引用

科学 2021年第3期73卷 13-16页

作者：范成新陈开宁张路钟继承古小治刘成中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室南京210008

在深入研究太湖底泥污染特性和水生生物适生性低下等突出的环境和退化问题基础上.探索污染底泥环保疏浚.底质适生性构建等关键技术难题,为有效控制富营养化湖泊内源污染.修复底质生境.提高湖泊水体质量提供新方法。

关键词：太湖底泥污染疏浚生态修复

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