Evolution of heavy metals in marsh areas under rice farming
Evolution of heavy metals in marsh areas under rice farming
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DOI：
10.1016/s0269-7491(98)00179-1
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发表时间：
1999-01-01
影响因子：
8.9
通讯作者：
Gimeno-García, E
中科院分区：
文献类型：
--
作者：
Andreu, V;Gimeno-García, E
研究了稻田土壤中Cd、Co、Cu、Ni、Pb和Zn的总量和EDTA提取态含量及其在剖面深度上的分布。1991-1995年研究了表层金属浓度的时间变化。结果表明，最高的金属浓度对应于锌，铅，铜，总和EDTA可提取的馏分。除Co和Ni在土壤深层含量最高外，其它重金属在土壤表层均有一定的积累。pH值和有机质是影响重金属在土壤中分布的主要因素。所有研究的金属与有效磷，氮，和砂质组分显着相关。这些金属的时间演变的研究表明，最显着的变化对应于镉，铜，镍，锌。虽然Cd表现出增加，Cu和Zn在这些土壤中趋于减少。(C)1999爱思唯尔科技有限公司。保留所有权利。
Total and EDTA-extractable concentrations of Cd, Co, Cu, Ni, Pb, and Zn in rice-farming soils and their distribution in the profile depth were evaluated. The temporal variability of metal concentrations in the superficial horizon was studied during 1991-1995. Results show that the highest metal concentrations correspond to Zn, Pb, and Cu, for total and EDTA-extractable fraction. In general, heavy metals showed an accumulation in soil surface, except for Co and Ni that have their highest values in the deeper horizons. pH and organic matter were the key parameters that regulate the distribution of metals in these soils. All the studied metals were significantly correlated with available P, N, and sand textural fraction. The study of the temporal evolution of these metals shows that the most significant variations correspond to Cd, Cu, Ni, and Zn. Although Cd shows an increase, Cu and Zn tend to decrease in these soils. (C) 1999 Elsevier Science Ltd. All rights reserved.