| 李富荣，赵 洁，文 典，等.不同种植模式对土壤重金属铅、镉形态分布的影响[J].广东农业科学,2015,42(9):56-61 |
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不同种植模式对土壤重金属铅、镉形态分布的影响 |
| Effects of different cropping patterns on speciationdistribution of soil heavy metals Pb and Cd |
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| DOI： |
| 中文关键词: 种植模式 铅 镉 重金属形态 水稻连作 菜稻轮作 蔬菜轮作 |
| 英文关键词: cropping pattern lead cadmium speciation of heavy metal paddy continuous cropping pattern vegetable-paddy rotation pattern vegetable rotation pattern |
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| 摘要点击次数: 1393 |
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| 中文摘要: |
| ：为更好地了解不同种植模式下重金属在土壤- 作物系统中的迁移转化规律，通过田间试验对水稻连
作、菜稻轮作、蔬菜轮作3 种珠三角常用种植模式下土壤重金属形态分布变化规律进行探讨。结果表明，3 种种
植模式下，土壤中铅各赋存形态的含量高低顺序大多呈现为可还原态> 残渣态> 可氧化态> 可交换态，可还原
态占37.26%～56.94%；土壤中镉大多以活性较高的形态存在，可交换态占46.70%～62.98%，各赋存形态的含量高
低顺序为可交换态> 可还原态> 可氧化态> 残渣态。就铅的3 种具有效性的形态可交换态、可还原态、可氧化态
总量而言，水稻连作和菜稻轮作比种植前都有所增加，而蔬菜轮作则较种植前有少量下降；而就镉具有效性的3
种形态总量而言，菜稻轮作下为增加，蔬菜轮作下为下降，而水稻连作模式变化不明显。铅可还原态与可氧化态
和残渣态能进行直接或间接的相互转化，呈现此消彼长的趋势；而对于土壤重金属镉的各赋存形态之间，可交换
态与可还原态呈极显著的负相关性，二者之间可进行相互转化。 |
| 英文摘要: |
| To understand the moving-transiting rule of heavy metals in soil-plant systems under different croppingpatterns，a field experiment was carried out in Huizhou， to investigate the effects of different cropping patterns，including the paddy continuous cropping pattern，vegetable-paddy rotation pattern and vegetable rotation pattern，onthe speciation distribution of soil heavy metals Pb and Cd. The results showed that the four Pb distribution forms underthe three cropping patterns showed the order of reducible > residual > oxidizable > exchangeable，and the content ofreducible form was 37.26%-56.94%. The soil Cd was dominated by the high activity fractions with 46.70%-62.98% andin the order of exchangeable > reducible > residual > oxidizable. The total content of three effective Pb distribution formsincreased under the paddy continuous cropping patternand vegetable-paddy rotation pattern，while it decreasedunder the other cropping pattern. For Cd，the total contentof three effective distribution forms increased underthe vegetable-paddy rotation pattern，decreased underthe vegetable rotation pattern，and unchanged under thepaddy continuous cropping pattern. Additionally，Pb inthe reducible form could transform with the oxidizableand residual form，while the Cd distribution formscould also mutually transfer between the exchangeable form and reducible form. As the soil heavy metal pollution inagricultural fields has become increasingly severe，it is very significant for screening the suitable cropping patterns witheconomic and ecological benefits as well as repairing effects of heavy metal contamination. |
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