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引用本文:陆敏,张卫国,师育新,俞立中,郑祥民.太湖北部沉积物金属和营养元素的垂向变化及其影响因素.湖泊科学,2003,15(3):213-220. DOI:10.18307/2003.0304
LU Min,ZHANG Weiguo,SHI Yuxin,YU Lizhong,ZHENG Xiangmin.Vertical Variations of Metals and Nutrients in Sediments from northern Taihu Lake and the Influencing Factors. J. Lake Sci.2003,15(3):213-220. DOI:10.18307/2003.0304
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太湖北部沉积物金属和营养元素的垂向变化及其影响因素
陆敏1, 张卫国2, 师育新1, 俞立中2, 郑祥民1
1.华东师范大学地理系, 上海 200062;2.华东师范大学河口海岸国家重点实验室, 上海 200062
摘要:
通过对太湖北部2个柱状沉积物进行了210Pb、粒度、金属元素、有机碳、总氮、总磷及磷的形态分析,探讨了其垂向分布特征及其影响因素. 粒度分析表明,沉积物呈现随深度变浅而变细的总体趋势. 210Pb分析显示该区域表层沉积物扰动较为强烈,并存在侵蚀现象. Cu、Zn、Ni、Li、V、Fe、Al垂向上的变化主要与粘土含量呈正相关,其含量表明金属污染不显著. 沉积物C/N比值显示有机质主要为陆源性质,磷以无机磷占绝对组分,有机磷含量向表层明显升高,反映了表层沉积物有机磷的输入较多或更好的保存条件.
关键词:  金属  营养元素  210Pb  粒度  太湖
DOI:10.18307/2003.0304
分类号:
基金项目:国家自然科学基金(40001020);上海市重点学科联合资助项目.
Vertical Variations of Metals and Nutrients in Sediments from northern Taihu Lake and the Influencing Factors
LU Min1, ZHANG Weiguo2, SHI Yuxin1, YU Lizhong2, ZHENG Xiangmin1
1.Department of Geography, East China Normal University, Shanghai 200062, P. R. China;2.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, P. R. China
Abstract:
Concentrations of metals, organic carbon (OC), total nitrogen (N), total phosphorus(P) and forms of phosphorus as well as activities of 210Pb and particle size were determined on two cores from northern Taihu Lake, China. The sediments are dominated by silts and clayey silts, which become finer upward. Results of 210Pb analysis indicate strong disturbance and erosion at the sampling sites. Concentrations of metals are:Cu, 15.8-35.6 mg/kg;Zn, 61.0-136.4 mg/kg;Ni, 26.6-46.2 mg/kg;Li, 36.7-69.0 mg/kg;V, 88.3-142.0 mg/kg;Ti, 3929.2-5508.9 mg/kg; Mn, 840.9-2369.8 mg/kg;Fe, 2.88-6.24 %;Al, 5.17-10.13 %. Levels of Cu, Zn, Ni, Li, V, Fe and Al show significant positive relationships with the fraction of clay and their down-core variations are therefore caused mainly by particle size. When compared to the mean contents of shale, these metals show no significant anthropogenic pollution. The ratio of OC to N (C/N) range from 9 to 20, suggesting a dominance of detrital input of organic matter. The dominant pool of phosphorus is the detrital form. In both cores, organic phosphorus increases toward the surface layer, implying either higher organic phosphorus input in recent years or its better preservation.
Key words:  Metals  nutrients  210Pb  particle size  Taihu Lake
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