【摘要】 采用野外调查与室内分析的方法研究了江汉平原及宜昌市城郊菜地土壤重金属Cu、Zn、Pb、Cd、Ni、As(铜、锌、铅、镉、镍、砷)的含量及其影响因素。结果表明,Cu、Zn、Pb、Cd、Ni、As的平均含量分别为61.7、153.4、33.7、0.24、28.7和4.2mg·kg-1,Cu、Zn、Pb和Cd4种元素呈累积趋势,为该区域菜地土壤的污染元素。重金属含量与土壤pH值的相关性不明显,与土壤有机质含量和CEC呈显著或极显著正相关,Cu、Pb、Cd、Ni的含量与<0.001mm粘粒含量呈显著正相关,Zn和As的含量与粘粒含量相关性不显著。随着种菜年限的增长,菜地土壤重金属呈增加趋势。宜昌市和荆州市郊区菜地土壤重金属含量较当阳市、仙桃市和沙洋县要高。更多还原

【Abstract】 This paper studied the contents of heavy metals (Cu?Zn?Pb?Cd?Ni?As) of vegetable plantation soil and their affecting factors in the suburbs of several cities in Jianghan plain with field investigation and laboratorial analysis in order to provide scientific recommendations for the pollution prevention of the heavy metals. The results showed that the mean contents of Cu?Zn?Pb?Cd?Ni and As were 61.7 mg·kg-1, 153.4 mg·kg-1, 33.7 mg·kg-1, 0.24 mg·kg-1, 28.7 mg·kg-1 and 4.2mg·kg-1 respectively; Four kinds of heavy metals (Cu?Zn?Pb and Cd) were the main pollution elements because of their accumulating trends in the vegetable plantation soil in the area. The contents of the heavy metals were positively related with the contents of soil organic matter and CEC, while no obvious correlation existed between the contents of the heavy metals and pH. There were also positive correlation between the contents of Cu?Pb?Cd and Ni and the contents of clay (<0.001) besides Zn and As. With the increase of the time for planting vegetable, the contents of the heavy metals increased. In general, the contents of the heavy metals of vegetable plantation soil in the suburbs of Yichang and Jingzhou city were higher than that in the suburbs of Dangyang, Xiantao and Shayang city.更多还原