杭州西郊茶园土壤重金属的积累特点与来源分析

杭州西郊茶园土壤重金属的积累特点与来源分析

摘要： 选择了杭州市西部近郊、远郊和农村等3个受人为不同程度影响的区块,分析了同为第四纪红土母质发育的茶园与附近林地土壤剖面中重金属垂直分布的特点,探讨了茶园土壤重金属的来源.结果表明,相同区块的茶园与附近林地土壤重金属Pb、Cd和Hg剖面分布相似,均随剖面深度下降,表土Pb、Cd和Hg含量随离城市距离增加而下降,说明研究区茶园土壤中重金属Pb、Cd和Hg的积累主要与大气沉降有关;茶园与附近林地土壤重金属Cu和Zn也随剖面深度而下降,但同一区块中茶园表土重金属Cu和Zn含量明显高于附近林地土壤,说明施肥等农业措施对茶园土壤Cu和Zn的积累有较大的影响;茶园土壤中Cu和Zn的积累与地理位置关系不大.茶园土壤中Cr和Co的积累不明显,并有淋失的趋势. Abstract： Three plots,including suburbs,outer suburbs,and countryside area with various anthropogenic influence,were selected for characterizing sources of soil heavy metals in tea gardens.Soils derived from quaternary red clay were sampled from both forest lands and tea gardens for each of three plots to analyze vertical distributions of heavy metals in the soils.The results showed that tea garden had similar vertical profile distributions of soil Pb,Cd,and Hg with its nearby forest land in the same plot,and concentrations of Pb,Cd,and Hg in both soils decreased with increasing soil depth.The concentrations of Pb,Cd,and Hg decreased with increasing the distance from the Hangzhou city.The results suggested that the accumulation of Pb,Cd,and Hg were related to local atmospheric depositions.The concentrations of soil Cu and Zn in both tea garden and its nearby forest land also decreased with increasing depth of soil profiles.However,the concentrations of Cu and Zn in surface soils from tea garden were significantly higher than those from its nearby forest land,suggesting that the accumulation of soil Cu and Zn in tea garden were related to agricultural management such as fertilization.The accumulation of soil Cu and Zn in the tea garden were not related to their geographic position.In contract with Pb,Cd,Hg,Cu,and Zn,no significant accumulations of Cr and Co in the soils from tea garden were found,and both Cr and Co in surface soils from tea garden showed a trend of leaching. 作 者： 李仪    章明奎    LI Yi    ZHANG Mingkui   作者单位： 浙江大学环境与资源学院,浙江省亚热带土壤与植物营养重点研究实验室,浙江,杭州,310029  期 刊： 广东微量元素科学    Journal： GUANGDONG TRACE ELEMENTS SCIENCE  年，卷(期)： 2010, 17(2)  分类号： X53 X14  关键词： 茶园土壤    重金属    积累    大气沉降    施肥    Keywords： tea garden    heavy metals    accumulation    atmospheric deposition    fertilization   

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