不同利用年限的红壤水稻土中重金属元素含量研究

Contents of Heavy Metal Elements in Paddy Soils Cultivated for Different Years in a Red Soil Region

本文介绍了不同利用年限的红壤水稻土中重金属元素As、Cd、Cr、Cu、Ni、Pb和Zn的含量变化,利用年限分别为3、10、15、30和80年。研究结果表明,虽然红壤水稻土中不同的重金属元素含量的变化趋势有所差异,但总体上重金属元素含量随利用年限的延长而降低,并可能达到一个相对稳定的水平;施用未经处理的城市垃圾会导致水稻土中某些重金属元素含量明显升高;研究区的水稻土已发生Cd和Cu污染。

This paper introduced the content changes of heavy metal elements (As, Cd, Cr, Cu, Ni, Pb and Zn) in paddy soils with 3, 10, 15, 30 and 80 cultivation years in a red soil region. The results showed that: different heavy metal elements gave different change tendencies of contents, but, generally,contents of heavy metal elements decreased with cultivatton year until reaching a relative stable stage.Application of untreated city wastes could cause obvious increases of some heavy metal contents in paddy soils, and Cd and Cu pollution happened in these studied paddy soils.