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Can phosphate compounds be used to reduce the plant uptake of Pb and resist the Pb stress in Pb-contaminated soils?

文献类型： 外文期刊

作者： Chen Shibao;Ma Yibing;Chen Shibao;Ma Yibing;Chen Li;Huang Yizong

作者机构：

关键词： Phosphate amendments;Lead;Superoxide dismutase (SOD);Malondialdehyde (MDA);Contaminated soil

期刊名称： JOURNAL OF ENVIRONMENTAL SCIENCES

ISSN：

年卷期：

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收录情况： SCI

摘要： The effects of different phosphate-amendments on lead (Pb) uptake, the activities of superoxide dismutase (SOD) and the level of malondialdehyde (MDA) in cauliflower (Brassica oleracea L.) in contaminated soils with 2500, or 5000 mg P{sub}2O{sub}5/kg soil of hydroxyapatite (HA), phosphate rock (PR), single-superphosphate (SSP) and the mix of HA/SSP (HASSP) were evaluated in pot experiments. Results showed that the Pb concentrations in shoots and roots decreased by 18.3%-51.6% and 16.8%-57.3% among the treatments respectively compared to the control samples. The efficiency order of these phosphate-amendments in reducing Pb uptake was as follows: HASSP ≈ HA > SSP ≈ PR. With the addition of SSP, HA and the mix of HA/SSP, the SOD activity in shoot was reduced markedly (P < 0.05) compared with that in the control group. For example, the SOD activities in shoot by the treatments of HASSP, SSP, and HA in 5000 mg P{sub}2O{sub}5/kg were found to be only 51.3%, 56.2%, and 56.7%, respectively. Similar effects were also observed on the level of MDA in the shoots with a decrease in 24.5%-56.3%. The results verified the inference that phosphate compounds could be used to reduce the plant uptake of Pb and resist the Pb stress in the plant vegetated in Pb-contaminated soils.

分类号： X21

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