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《Journal of Lake Sciences》 2009-05
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Contents and distribution characteristics of soluble organic nitrogen in surface sediments of lakes

LIN Sumei1,2, WANG Shengrui2, JIN Xiangcan2 & HE Xingcun3 (1: College of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, P.R.China) (2: State Environmental Protection Key Laboratory of Lake Pollution Control, Research Center of Lake Environment, Chinese Research Academy of Environmental Science, Beijing 100012, P.R.China) (3: College of Environmental Science and Resource, Guangxi Normal University, Guilin 541004, P.R.China)  
The contents and distribution characteristics of soluble organic nitrogen (SON) extracted with 1mol/L KCl from the sediments of six typical lakes including Lake Poyang, Lake Dongting in Hunan and Jiangxi Provinces were studied. The results indicated that the SON contents varied greatly from 17.18mg/kg to 292.31mg/kg (mean content,134.45mg/kg), comprising 51.86% of total soluble nitrogen (TSN) and 7.14% of total nitrogen (TN) in six lakes. The SON contents were significantly correlated with their contents of TN and TSN, and SON were higher in the heavily polluted sediments than the light polluted ones. Their distributions of SON were closely related to their lake pollution levels. The contents of free amino acid in the sediments were also studied, and they varied from 4.69 to 42.04mg/kg, comprising 18.80% of SON, and 1.24% of TN, and were significantly correlated with their SON contents. The mean content of FAA was 23.27mg/kg, higher than those in soils in the same region. It indicated that there was more bioavailable SON from lake sediment than those from soil. The contents of SON in the sediments were also correlated with inorganic nitrogen, OM and CEC and so on. As one of the most important nitrogen compositions in lake sediments, SON should be paid more attention to the nitrogen cycling and entrophication control in lakes.
【Fund】: 国家自然科学基金项目(40873079);; 科技部基础性工作专项重点项目“中国湖泊水质、水量和生物资源调查”(2006FY110600);; 中央级公益性科研院所基本科研业务专项项目(2007KYYW27)
【CateGory Index】: P342
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