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引用本文:尹洪斌,范成新,蔡永久.太湖表层沉积物AVS与SEM分布特征及相互关系.湖泊科学,2008,20(5):585-590. DOI:10.18307/2008.0506
YIN Hong-bin,FAN Cheng-xin,CAI Yong-jiu.Distribution characteristic and correlation of AVS and SEM in surface sediments of Lake Taihu. J. Lake Sci.2008,20(5):585-590. DOI:10.18307/2008.0506
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太湖表层沉积物AVS与SEM分布特征及相互关系
尹洪斌1,2, 范成新1, 蔡永久1,2
1.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;2.中国科学院研究生院, 北京 100049
摘要:
对全太湖28点的表层沉积物中的AVS及SEM的分布特征与相关性进行研究.结果表明:表层沉积物的AVS浓度在空间分布上具有较大的波动(变异系数达100.77%),河口沉积物中赋存高浓度的AVS.结合AVS的分布特征得知:沉积速率及SO42-负荷可能是造成AVS空间差异性的原因.河口区域具有较高浓度的∑SEM;太湖北部湖区沉积物中的∑SEM浓度高于南部.应用SEM/AVS,SEM-AVS及SEM-AVS/fOC这三个模型来评价太湖表层沉积物的质量(当SEM/AVS>9或SEM-AVS>2或SEM-AVS/fOC>150μmol/g(OC)时,沉积物重金属将具有毒性),结果表明:只有0# 号点和6#号点超过这三个模型其中的一个和两个的阈值范围,其它采样点均在阈值范围之内.总之,除0#号点和6#号点外,太湖表层沉积物(约10cm)中重金属不会对底栖生物产生明显毒性.
关键词:  AVS与SEM  重金属  沉积物质量  太湖
DOI:10.18307/2008.0506
分类号:
基金项目:国家自然科学基金重点项目(40730528)资助
Distribution characteristic and correlation of AVS and SEM in surface sediments of Lake Taihu
YIN Hong-bin1,2, FAN Cheng-xin1, CAI Yong-jiu1,2
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China;2.Graduate School of Chinese Academy of Sciences, Beijing 100049, P.R.China
Abstract:
The distribution characteristic and correlation of AVS and SEM were studied in 28 surface sediments of whole Lake Taihu. The results showed that the concentration of AVS varied greatly in space (COV up to 100.77%), and high concentration of AVS were recorded in estuary of lake. Combined with the distribution characteristic of AVS, deposition rate and load of SO42- probably caused the spatial difference of AVS. The high concentration of SEM was recorded in the area of estuary, and the concentration of SEM in northern part of Lake Taihu was higher than in the southern part. Three models including SEM/AVS, SEM-AVS and SEM-AVS/fOC (Toxicity was predicated when SEM/AVS>9 or SEM-AVS>2 or SEM-AVS/fOC >150μmol/g(OC)) were used to assess the sediment quality of Lake Taihu, and results showed that only site 0# and 6# exceeded the threshold of one and two of the three models. Overall, the surface sediments of Lake Taihu could not cause toxicity to benthic organism except site 0# and 6#.
Key words:  AVS and SEM  heavy metals  quality of sediment  Lake Taihu
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