School of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, China.
School of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, China; School of Geography and Resource Science, Neijiang Normal University, Neijiang 641100, China.
Ecotoxicol Environ Saf. 2024 Sep 15;283:116817. doi: 10.1016/j.ecoenv.2024.116817. Epub 2024 Jul 30.
The study explored the impact of water management on rice cultivation in mercury-contaminated paddy soil. The objective was to analyze the characteristics of mercury translocation by converting flooded soils to dry farming (non-flooded) to alleviate mercury accumulation in rice grains. The experiment was conducted over three consecutive rice-growing seasons, employing two distinct water management models: a continuously flooded rice cultivation mode and a flooded rice planting mode in the first season, followed by a non-flooded rice farming mode in the second and third seasons. The results showed that the change from flooded to non-flooded rice cultivation patterns presented extremely excellent environmental potential for inhibiting the uptake of both methylmercury and total mercury in rice. When transitioning from flooded cultivation to dry farming, the concentration of methylmercury and total mercury in the grains of non-flooded rice decreased by 87.15 % and 9.57 %, respectively, compared to that in the grains of flooded rice. In the third season, the methylmercury and total mercury in the grains of non-flooded rice decreased further by 95.03 % and 69.45 %, respectively. This study verified that the conversion of rice cultivation from flooded to non-flooded is an efficient strategy for suppressing the accumulation of methylmercury in rice grains, and it might offer a promising solution for managing soil mercury risks and ensuring the safety of rice for human consumption.
该研究探讨了水分管理对受汞污染稻田中水稻种植的影响。目的是分析通过将淹水土壤转化为旱作（非淹水）来减轻稻谷中汞积累的汞迁移特征。该实验在三个连续的水稻种植季节进行，采用两种不同的水分管理模式：连续淹水的水稻种植模式和第一季的淹水水稻种植模式，然后在第二季和第三季采用非淹水的水稻种植模式。结果表明，从淹水到非淹水的水稻种植模式的变化对抑制水稻中甲基汞和总汞的吸收具有极好的环境潜力。从淹水种植转为旱作时，非淹水水稻籽粒中甲基汞和总汞的浓度分别比淹水水稻籽粒中降低了 87.15%和 9.57%。在第三季，非淹水水稻籽粒中的甲基汞和总汞又分别降低了 95.03%和 69.45%。本研究验证了将水稻种植从淹水转为非淹水是抑制稻谷中甲基汞积累的有效策略，为管理土壤汞风险和确保人类食用大米的安全提供了有前景的解决方案。
