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地理科学  2001 

向海湿地沉积芯重金属对流域环境污染示踪

, PP. 549-553

Keywords: 重金属,沉积芯,向海湿地

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Abstract:

选取霍林河下游向海沼泽湿地为研究对象,采用重力沉积芯采样钻钻孔采样与剖面切割采样相结合的方法,采集了10个沉积柱芯及剖面,对沉积物重金属元素Cu、Zn、Cr、Ni、Co、Pb、Fe、Mn及pH、TOC在剖面中的分布进行高分辨率研究。结果显示,剖面上部沉积物表层沉积序列内已明显富集了Fe、Mn、Zn等重金属,并与TOC含量呈显著相关。与此相反,大多数沉积柱芯下层的重金属含量相对较低。研究表明,高分辨率取样易找出元素间相关性,那些水源来自同一相对稳定外源输入的沉积柱芯中的重金属与TOC表现出更显著的相关性。越靠近河流,淹没频率越高,沼泽湿地表层沉积物中重金属元素含量趋向增高。

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