我国农田生态系统重金属的循环与调控
摘要： 本文系统分析了我国农田土壤重金属的含量状况，探讨了农田生态系统中重金属的输入、输出及其平衡.农田生态系统中重金属存在一定的累积效应，但整体上超标风险较小，而部分作物、特别是蔬菜可能存在一定的超标风险.在采矿区和冶炼厂周边地区，以及废弃物利用强度较大的农区，土壤和作物中重金属超标的风险较大，是普通农区的十倍甚至数十倍以上.针对我国农田重金属污染现状，提出了调控农田生态系统重金属循环的有效措施，并对相关领域今后的研究进行了展望.
关键词: 重金属, 农田生态系统, 循环, 调控, 冻融作用, 陆地生态系统, 氮循环, 过程, 机制
Abstract: This paper analyzed the current situation of heavy metal contamination in cropland soils in China, and discussed the input, output, and balance of heavy metals in cropland ecosystems. It was considered that heavy metals had definite accumulation in cropland ecosystems, but overall speaking, this accumulation had relatively small environmental risk, and only some plants, especially vegetables, accumulated heavy metals over the standards. In mining areas, adjacent areas of smelting plants, and the farming areas using larger amounts of related wastes, the heavy metals content in plants and soils was at least ten times higher than that in normal croplands, existing larger environmental risk. Aiming at the current situation of heavy metal contamination of farmland soils in China, some effective regulation measures for the heavy metal cycling in the cropland ecosystems were proposed, and the further research prospects in related fields were discussed.
Key words: heavy metal, agro-ecosystem, cycling, regulation, freeze-thaw processes, terrestrial ecosystem, nitrogen cycle, process, mechanism.
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网址: 我国农田生态系统重金属的循环与调控 https://m.huajiangbk.com/newsview655826.html
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