摘要
选取霍林河下游二百方子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 8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、总有机碳 (TOC)、全氮 (TN)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并接近地球化学天然背景水平。研究表明 ,高分辨率取样易找出元素间相关性。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越高。
Eight sediment cores collected with gravity corer and sediment profiles dug by handed tools from the EBFZ marsh downstream of the Huolin River were studied with high resolution distribution of heavy metal (Cu, Zn, Cr, Ni, Co, Pb, Fe, Mn), pH, TOC and TN. The results showed that Zn, Fe and Mn were inriched in the upper part of the sedimentary sequence and significantly correlated with TOC. On the contrary, heavy metal contents in most of the deeper layers of sediment cores were relatively lower and closed to geochemical background levels. Correlation between elements was easier to identify with high resolution sampling. Heavy metal contents in the upper layers are higher in sediments that are closer to river and have high flooding frequency.
出处
《土壤学报》
CAS
CSCD
北大核心
2002年第6期810-812,共3页
Acta Pedologica Sinica
基金
中国科学院知识创新工程项目"中国典型湿地水陆相互作用过程
资源环境效应及调控"(KZCX2 - 30 2 )资助
