农业小流域土壤重金属面源迁移特征

农业小流域土壤重金属面源迁移特征(6300字)
摘  要：近年来，土壤重金属对生态环境的影响已引起人们广泛的关注。本文通过对株洲马家河镇土壤中重金属的含量和径流出口处水样的浓度，来分析当地土壤重金属的迁移特征，以此对当地土壤环境评价和土地质量评价起到指示和引导作用。研究表明，土壤中Cd、Pb和Zn呈不同程度的污染。其中Cd的污染最严重，土壤中Cd的含量超过国家三级标准中的土壤环境质量限定值。随着降雨量的增加，水样中的重金属的总量增加。其中流域内径流水样中Pb的含量超标。
关键词：土壤重金属；污染；迁移

NON-POINT MIGRATIONi CHARACTERTISTICS OF HEAVY METAL OF SOIL WITHIN SMALL AGRICULTURAL WATERSHED
Abstract: In recent years, the influence that soil heavy metal on the ecological environment has been attracted wide attention by people.Through to the content of heavy metals in soil and the concentration in the water in the town of Majiahe, Zhuzhou,to analyze the migration characteristics of soil heavy metal in local In order to local soil environment evaluation and land quality evaluation to instructions and guidance.Studies show that soil Cd, Pb and Zn was different levels of pollution. Among them the content of national level 3 Cd more than the standard soil environmental quality of limited value. Along with the increase of the rainfall and water to the amount of the heavy metal increased. The basin of water content of Pb in runoff to exceed bid.
Key words：Soil heavy metal; pollution; migration

目    录
摘  要    1
关键词    1
1 引言    2
1.1 土壤重金属污染    2
1.2 污染来源    2
1.3 污染现状    3
1.4 国内外对土壤重金属污染的研究    3
1.5 土壤重金属的迁移方式    4
2 材料与方法    4
2.1 研究区概况    4
2.2 样品采集    4
2.3 实验分析    5
2.31 样品的预处理    5
2.32 样品分析    5
2.33 数据处理    5
2.34 研究方法    5
3 结果与分析    5
3.1土壤重金属的统计性描述    5
3.2 土壤重金属的迁移    6
3.21 降雨量对流失水量体积的影响    6
3.21 降雨量对流失水量中重金属的影响    6
4 结论    8
5 存在的问题及研究展望    8
参考文献    9
致  谢    10