| 成都经济区黄壤土壤剖面Pb形态分布特征及其影响因素 |
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| 引用本文： | 杨晓燕,侯青叶,杨忠芳,杨艳,赵志丹.成都经济区黄壤土壤剖面Pb形态分布特征及其影响因素[J].现代地质,2008,22(6). |
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| 作者姓名： | 杨晓燕 侯青叶 杨忠芳 杨艳 赵志丹 |
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| 作者单位： | 中国地质大学,地球科学与资源学院,北京,100083 |
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| 基金项目： | 中国地质调查局国土资源调查项目
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| 摘 要： | 土壤剖面中不同形态铅迁移转化及其影响因素的研究对于了解Pb的土壤地球化学行为具有非常重要的意义。以四川省成都经济区农田生态系统黄壤剖面中不同形态Pb分布特征为例,探讨黄壤剖面中不同形态Pb的迁移转化影响因素及其生态危害性。结果表明:在黄壤剖面中,Pb总量表现为表层富集、深层稳定的特点;弱有机结合态含量表现为表层富集、深层稳定的特点,其他形态Pb含量剖面分布特征不明显;土壤中的Pb主要是以铁锰氧化态和残渣态为主,其他形态Pb含量所占比例较小;成土过程中,随着Pb总量的增加,稳定态Pb含量增加,而活动态相对减少;土壤pH值对各形态Pb含量分布影响较大,尤其是对碳酸盐结合态的影响显著;土壤总有机碳也是影响土壤中各形态Pb含量分布的重要因素之一,尤其是对有机结合态Pb含量影响显著;而随着土壤熟化程度的增加,黄壤剖面中的活动态含量增加,稳定态减少;剖面中的Pb迁移系数和生物可利用系数均较小,说明Pb不易向下迁移,容易在表层富集,对植物及人类有一定的危害。
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| 关 键 词： | Pb 形态 分布特征 黄壤剖面 成都经济区 pH TOC 土壤质地 |
Form Distribution and the Influencing Factors of Pb in YeIlow Soil Profiles from Chengdu Economic Area,China |
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| YANG Xiao-yan,HOU Qing-ye,YANG Zhong-fang,YANG Yan,ZHAO Zhi-dan.Form Distribution and the Influencing Factors of Pb in YeIlow Soil Profiles from Chengdu Economic Area,China[J].Geoscience——Journal of Graduate School,China University of Geosciences,2008,22(6). |
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| Authors: | YANG Xiao-yan HOU Qing-ye YANG Zhong-fang YANG Yan ZHAO Zhi-dan |
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| Abstract: | It's very important to study the factors that affect the transport of different forms of Pb in the pedogenetic process to understand geochemical behaviors of lead.In this article the distribution of the different forms of Pb in yellow soil profiles in Chengdu economic zone agro-ecosystems from Sichuan was been described,and the factors controlling the different forms' transport and transformation were also been discussed.We focus on the distribution features of lead species in yellow soil profiles in Chengdu agro-ecosystems in Sichuan Province in order to assess the ecological safety.The results showed that the total Pb was enriched in the surface and was stable in the deep.In yellow soils,the main existing forms of lead were residual state and Fe-Mn oxidual state.And the increasement of total Pb led to the content of stable state Pb increasing.pH has significant influence on the transferring of Pb species,especially for the carbonate Pb.The total organic carbon and clay minerals contents also effect on transferring of Pb.The bioavailability and the mobility index for yellow soil are also low,which suggest that the cultivated soils have certain harm to the plant and the humanity. |
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| Keywords: | Pb pH TOC |
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