三峡库区消落带土壤剖面中重金属分布特征  被引量:30

Distribution Characteristics form Soil Profile Heavy Metal of Water-Level-Fluctuating Zone in Three Gorges Reservoir Area

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作  者:裴廷权[1] 王里奥[1] 韩勇[2] 黄川[1] 龚勋[1] 

机构地区:[1]重庆大学资源及环境科学学院,重庆400030 [2]重庆市环境保护局,重庆400015

出  处:《环境科学研究》2008年第5期72-78,共7页Research of Environmental Sciences

基  金:重庆市发展改革委员会、重庆市科学技术委员会专项基金项目(03-26)

摘  要:通过对三峡库区消落带土壤的研究,探讨了土壤剖面中重金属的分布特征.结果表明:紫色土淋溶层(A层)w(Cd)和w(Hg)平均值,母质层(C层)w(Cd),w(Zn)和w(Hg)平均值均高于全国同类、同层次土壤的平均水平;石灰岩土A层及C层的重金属质量分数平均值均低于全国同类、同层次土壤的平均水平.从上游至下游,w(Cu)和w(Zn)平均值呈降低趋势,其他重金属质量分数的变化不明显.城区附近土壤重金属质量分数明显高于其他地区.土壤中w(Cd),w(Cr),w(As),w(Hg)和w(Ni)服从正态分布(Sig.>0.05),土壤pH与w(Cd)和w(Cu)之间具有正相关关系(显著性水平为0.01).土壤中w(Cd)与w(Cu),w(Cd)与w(Ni),w(Cu)与w(Zn),w(Cu)与w(Cr),w(Pb)与w(Zn),w(Pb)与w(As),w(Pb)与w(Hg),w(Pb)与w(Ni),w(Zn)与w(Ni)和w(Hg)与w(Ni)之间具有一定的正相关关系;w(Cd)与w(Pb),w(Cd)与w(Zn),w(Cd)与w(As),w(Cu)与w(Ni)和w(Hg)与w(Cr)之间具有一定的负相关关系.The heavy metal elements distribution characteristics in the soil profile were studied based on the research of water-level-fluctuating zone in Three Gorges Reservoir area. The results indicate that the averages of w (Cd) and w (Hg) in the leaching layer (A layer) of purple soil and w (C d), w (Zn) and w (Hg) in parent material layer (C layer) are all higher than that of the soils of the same kind and level in China. The average contents of heavy metals in the A, C layer of limestone soil are lower than that of the same kind and level in China. Moreover, from upstream to downstream, the averages of w (Cu), w (Zn) display constantly decrease trend along the Yangtze River, but the regulation of other heavy metals is not distinct. The contents of heavy metals near the city zones are higher than that in other places, w ( Cd), w(Cr), w(As), w(Hg), w(Ni) display a normal distribution (Sig. 〉 0.05). The pH and w(Cd), w(Cu) take on positive correlation (Sig. = 0.01). w(Cd)-w(Cu), w(Cd)-w(Ni), w(Cu)-w(Zn), w(Cu)-w(Cr), w(Pb)-w(Zn), w(.Pb)-w(As), w(Pb)-w(Hg), w(Pb)-w(Ni), w(Zn)-w(Ni), w(Hg)-w(Ni) in soil present positive correlation, while w(Cd)-w(Pb), w(Cd)-w(Zn), w(Cd)- w(As), w(Cu)-w(Ni), w(Hg)-w(Cr) in soil present negative correlation.

关 键 词:三峡库区 消落带 土壤剖面 重金属 分布特征 

分 类 号:X53[环境科学与工程—环境工程]

 

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