杭州西郊茶園土壤重金屬的積累特點與來源分析

摘要： 選擇了杭州市西部近郊、遠郊和農(nóng)村等3個受人為不同程度影響的區(qū)塊,分析了同為第四紀紅土母質(zhì)發(fā)育的茶園與附近林地土壤剖面中重金屬垂直分布的特點,探討了茶園土壤重金屬的來源.結(jié)果表明,相同區(qū)塊的茶園與附近林地土壤重金屬Pb、Cd和Hg剖面分布相似,均隨剖面深度下降,表土Pb、Cd和Hg含量隨離城市距離增加而下降,說明研究區(qū)茶園土壤中重金屬Pb、Cd和Hg的積累主要與大氣沉降有關(guān);茶園與附近林地土壤重金屬Cu和Zn也隨剖面深度而下降,但同一區(qū)塊中茶園表土重金屬Cu和Zn含量明顯高于附近林地土壤,說明施肥等農(nóng)業(yè)措施對茶園土壤Cu和Zn的積累有較大的影響;茶園土壤中Cu和Zn的積累與地理位置關(guān)系不大.茶園土壤中Cr和Co的積累不明顯,并有淋失的趨勢. 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： 李儀    章明奎    LI Yi    ZHANG Mingkui   作者單位： 浙江大學環(huán)境與資源學院,浙江省亞熱帶土壤與植物營養(yǎng)重點研究實驗室,浙江,杭州,310029  期 刊： 廣東微量元素科學    Journal： GUANGDONG TRACE ELEMENTS SCIENCE  年，卷(期)： 2010, 17(2)  分類號： X53 X14  關(guān)鍵詞： 茶園土壤    重金屬    積累    大氣沉降    施肥    Keywords： tea garden    heavy metals    accumulation    atmospheric deposition    fertilization   

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