长春市黑土城乡交错区重金属地球化学特征及生态风险评价  

Geochemical characteristics of heavy metals in black soil peri-urban area and its evaluation of ecological risk

作　　者：高婉莹 王冬艳[1] 王兴佳 金晓彤 卢佳希 GAO Wanying;WANG Dongyan;WANG Xingjia;JIN Xiaotong;LU Jiaxi(College of Earth Sciences,Jilin University,Changchun 130061,China)

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《世界地质》2023年第4期749-760,共12页World Geology

基　　金：国家自然科学基金项目(42071255)。

摘　　要：以位于东北典型黑土区的长春市城乡交错区为研究区,以土壤-作物系统中Cu、As、Pb和Zn为研究对象,采用Pearson相关性分析及土壤和作物综合质量指数对土壤-作物系统地球化学特征及生态风险进行评价。结果显示,表层土壤重金属存在明显的积累现象,作物籽实重金属含量均未超标,作物籽实对土壤中Zn和Cu的吸收富集能力显著高于As和Pb。不同重金属在土壤-作物系统中的迁移能力不同可能与作物种类、pH值、有机质、N、P和K_(2)O含量有关。作物重金属生物富集系数空间分布特征与作物籽实重金属含量空间分布特征相似,与土壤重金属含量空间分布特征存在显著差异。IICQ介于0.13~4.44,均值为0.62。研究区耕地土壤环境质量整体良好,仅中部存在小范围呈圈层分布的风险区域。The elements of Cu,As,Pb,Zn in the soil-crop system of the peri-urban area of Changchun City has been selected,where is located in the typical black soil region of Northeast China.With Pearson correlation analysis and the influence index of comprehensive quality,the characteristics of geochemistry and ecological risk of soil-crop system have been evaluated.The results indicate that there is obvious accumulation of heavy metals in surface soil,and none of the heavy metal contents of crop grains exceeds the risk value.The absorption and accumulation of Cu and Zn by crop grains are significantly higher than As and Pb.Different heavy metal transport capacity in different soil-crop system may be related to crop species,pH values,TOM,N,P and K_(2)O contents.The spatial distribution characteristics of the bioaccumulation factor were similar to crop grains,but different from soil.The IICQ ranges from 0.13 to 4.44,with a average of 0.62.The soil environment quality is good in the study area,with only a small circular part in the central area being of ecological risk.

关 键 词：重金属 土壤-作物系统 地球化学特征 生态风险 黑土城乡交错区 长春市 

分 类 号：P595[天文地球—地球化学] X53[天文地球—地质学]