广州郊区农业土壤重金属含量与土壤性质的关系

Relationship between heavy metals and property of agricultural soil in Guangzhou suburb.

研究了广州郊区农业土壤性质和土壤中的重金属含量,并对2者的相关关系进行了分析。结果表明:广州郊区农业土壤中壤土占样品总数的70.5%,土壤pH值平均为5.93,土壤有机质平均含量为31 7g·kg-1,土壤阳离子交换量不高,且各区之间变幅较大;Cu、Pb、Zn、Ni、Cd、As和Hg有效态含量在3种土壤中顺序为菜园土>水稻土>赤红壤;土壤重金属和土壤理化性质间的关系复杂,如有效态Cu、Zn、Ni与土壤有机质含量呈极显著相关,Cd与土壤有机质含量和土壤粘粒含量呈极显著相关,As除与有机质含量和粘粒含量有关,与pH、阳离子交换量也有极显著相关关系。

Soil property and heavy metal content of agriculture soil in the suburbs of Guangzhou were studied to analyse relations between soil property and soil heavy metal content.The results showed that the 70.5% of the samples gathered in the suburbs of Guangzhou were loamy soil with an average pH value being 5.93,and an average content of organic matter being 317 g·kg^(-1).Though not high, CEC of the soil varied greatly from site to site.The distribution of Cu,Pb,Zn,Cr,Ni,Cd,As and Hg differed in garden soil,latosolic red soil and paddy soil.The results of correlation analysis showed that the relations between soil heavy metal and the soil property were very complicated.