摘要
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。
Here we report a case study on the Xianghai wetlands at downstream of the Huolin River. Core sam-p1es were taken with a gravity corer and profile samples dug by handed-tools. Ten cores and profiles were takenand studied with high-resolution to Cu, Zn, Cr, Ni, Co, Pb, Fe, Mn, pH, TOC and TN in sediments. Withinthe upper part of the sedimentary sequences, there were clear enrichments of Zn, Fe and Mn, and they dis-played remarkable re1ativity with TOC, especially for the cores whose water source was coming from the samerelatively stable outer-source input. On the contrary, the content of heavy metals in the most of the lower partsof the core profiles were re1atively 1ower and closed to natural gepchemica1 background 1eve1s. It is easy to findthe relativity among the elements if sampling with high-resolution. The nearer to the river and the higher inun-date frequency by its floods, the higher of the contents of heavy metals within the upper part of the sedimentarysequences.
出处
《地理科学》
CSCD
北大核心
2001年第6期549-553,共5页
Scientia Geographica Sinica
基金
中科院创新工程"中国典型湿地水陆相互作用过程
资源环境效应及调控"(KZCX2-302)资助。
