| 贺前锋,桂娟,刘代欢,李学钊,李鹏祥,权胜祥.淹水稻田中土壤性质的变化及其对土壤镉活性影响的研究进展[J].农业环境科学学报,2016,35(12):2260-2268. |
| 淹水稻田中土壤性质的变化及其对土壤镉活性影响的研究进展 |
| Research progress of soil property's changes and its impacts on soil cadmium activity in flooded paddy field |
| 投稿时间：2016-07-06 |
| DOI：10.11654/jaes.2016-0892 |
| 中文关键词: 淹水 稻田 土壤性质 镉活性 镉污染 |
| 英文关键词: flooding paddy soil soil property Cd activity Cd pollution |
| 基金项目:湖南省科技计划项目（2016TP2018） |
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| 摘要点击次数: 2979 |
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| 中文摘要: |
| 近年来，面对稻田土壤镉（Cd）污染日益严重和“镉米”事件频发的现状，许多专家对稻田土壤镉的活性变化及其污染治理进行了大量研究，大多数研究表明淹水能降低稻田土壤Cd的活性和稻米Cd的含量。但是，由于稻田土壤自身的复杂性以及影响因素的多样性、综合性和不确定性，尤其是在淹水条件下，稻田土壤性质[土壤胶体和团聚体、pH和Eh（pe+pH）、阴离子和阳离子、铁锰氧化物和含硫化合物、有机质和可溶性有机物、碳酸盐和磷酸盐、根系分泌物和微生物等]发生了复杂变化，使得Cd活性变化更加复杂，Cd污染的防控和修复更加困难。通过综述淹水条件下稻田土壤性质的变化，阐述了这些变化对土壤中Cd活性的影响，同时对该领域的研究方向进行了展望，旨在为实现Cd污染稻田的农业安全生产提供理论依据，并为Cd污染土壤的修复治理提供参考。 |
| 英文摘要: |
| Soil is the first line of defense to protect the crop safety, and the material basis for the human food quality and ecological environmental security. Since soil cadmium(Cd) pollution in paddy field and "Cd-polluted rice" issue become more severe in recent years, more and more researches focus on the changes of soil Cd activity and its pollution restoration. Previous results showed that submerged condition could help decrease soil Cd activity in soil and also lower the Cd content in rice. However, due to the complexity of the soil, and the diversity, comprehensiveness and uncertainty of external factors, especially under submerged condition, soil properties may have complex change. On one hand, the adsorption of soil colloid, aggregate, iron/manganese oxides, organic matters and phosphate, the rise of soil pH and reduction of Eh, the obstruction of oxide plaque on root surface, the coprecipitation of sulfide, the reduction of reducing bacteria, and the chelation of root exudates could lead to reduce Cd activity. On the other hand, the coordination of anions, the dissolution of iron/manganese oxides and carbonates, the adsorption of oxide plaque, the chelation of DOM, and activation of root exudates could increase Cd activity. These changes make the movement and transformation of Cd more complex, which may increase difficulty of Cd remediation in soil. In this paper, we summarized the changes of soil property and their effects on soil Cd activity in flooded paddy field, as well as pointed out future research directions. This paper could help provide theoretical basis for the agricultural production safety and references for Cd pollution remediation in paddy field. |
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