贵定茶产区土壤重金属含量垂直分布特征

为掌握贵定茶产区土壤重金属的垂直分布特征,测定了贵定茶产区不同茶园和不同生态环境中土壤重金属元素（As、Pb、Cr、Cd、Hg）在各剖面土层中的含量,并进行垂直变异分析.结果表明：5种重金属的含量都随土层深度的加深呈下降趋势,表层变异大,垂直方向上Pb和Cr的含量变异最大,As含量变异最小,表明Pb和Cr受外源影响大.表层土壤有机质与各重金属含量呈正相关,有机质是影响重金属表层积累的重要因素.Pb和Cr含量的相关性极显著,且不受土层深度的影响,表明二者来源可能相同.不同生态环境茶园中,远离外源污染的原生茶园土壤重金属含量最低（Cd、Hg除外）,垂直变异最小,人工茶园则最大.不同茶园中,方家茶园...

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Bibliographic Details
Published in广东农业科学 Vol. 41; no. 3; pp. 175 - 179
Main Author 赵路玥 张清海 张珍明 林绍霞 刘红 林昌虎
Format Journal Article
LanguageChinese
Published 贵州科学院,贵州贵阳550001 2014
贵州大学农学院,贵州贵阳,550025%贵州省分析测试研究院,贵州贵阳,550002%贵州省生物研究所,贵州贵阳,550009%贵州大学生命科学学院,贵州贵阳,550025%贵州大学农学院,贵州贵阳550025
Subjects
土壤重金属
垂直分布
茶产区
贵定
土壤重金属
贵定
茶产区
垂直分布
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ISSN1004-874X

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Summary:为掌握贵定茶产区土壤重金属的垂直分布特征,测定了贵定茶产区不同茶园和不同生态环境中土壤重金属元素（As、Pb、Cr、Cd、Hg）在各剖面土层中的含量,并进行垂直变异分析.结果表明：5种重金属的含量都随土层深度的加深呈下降趋势,表层变异大,垂直方向上Pb和Cr的含量变异最大,As含量变异最小,表明Pb和Cr受外源影响大.表层土壤有机质与各重金属含量呈正相关,有机质是影响重金属表层积累的重要因素.Pb和Cr含量的相关性极显著,且不受土层深度的影响,表明二者来源可能相同.不同生态环境茶园中,远离外源污染的原生茶园土壤重金属含量最低（Cd、Hg除外）,垂直变异最小,人工茶园则最大.不同茶园中,方家茶园重金属含量最高,七里冲茶园的As垂直变异最大,云雾中心茶园和旧治茶园的Pb、Cr垂直变异最大.在不同品种茶园重金属含量和垂直变异基本表现为人工鸟王茶园＞人工福鼎茶园＞野生鸟王茶园.
Bibliography:The objective of this paper was to clarify the vertical spatial variability of heavy metals in Guiding tea area by analyzing the heavy metal （As, Pb, Cr, Cd and Hg） contents in each soil horizon of different tea plantation and situ field. The results show that the heavy metal concentrations even decrease with increasing soil depth, and distribution characteristic of heavy metal in soil surface is obviously, and Pb and Cr contents have big variation. However, as has low spatial variation in topsoil, which indicate external pollution sources are the main causes. Organic matter is positive significantly correlated with all heavy metals in soil surface. Pb is highly significantly correlated with Cr in soil profile, which show a background level. The wild tea gardens which are far away fi＇om external pollution sources have lower heavy metal concentrations and lower vertical spatial variation than the other tea areas except Cd and Hg, which in artificial tea garden are opposite. Fang＇s tea plantation has the highes
ISSN:1004-874X