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通过灌管理来控制来自大米的As和Cd的暴露

Matt A Limmer¹, Angelia L Seyfferth²

¹Department of Plant and Soil Science, University of Delaware, Newark, DE, USA.

Environmental geochemistry and health

|July 29, 2024

概括

灌管理策略会影响大米中 (As) 和 (Cd) 的吸收. 虽然干燥的条件减少了As,但它们增加了Cd,阻止了谷物中两种重金属的同时减少.

科学领域:

农业科学农业科学
环境化学环境化学
土壤科学土壤科学

背景情况:

灌管理影响了对米生产至关重要的生态化学循环.
洪水淹没的田条件在减少条件下增加了 (As) 工厂的可用性.
酸性土壤中的氧化条件提高了植物的 (Cd) 可用性,而 (Mn) 运输体介导了 (Cd) 的吸收.

研究的目的:

调查通过灌管理实现的中间氧化还原条件是否可以同时减少大米谷中的As和Cd.
了解由土壤氧化还原潜力和营养素竞争影响的As和Cd吸收机制.
评估不同灌策略在减轻大米重金属积累方面的有效性.

主要方法:

进行了为期2年的实地研究,对6种不同的灌管理实践进行了研究.
监测了土壤的氧化还原潜力,孔水化学和植物营养度.
在大米植物和谷物中定量As和Cd度,并测量了甲排放.

主要成果:

灌管理显著影响了土壤化学,氧化还原潜力,植物As和Cd度以及甲排放.
干燥灌管理减少了植物A,对有机A的影响更大.
增加的有氧条件导致了较高的植物Cd,与孔水Mn负相关,谷物Cd无法与As同时降低.

结论:

仅仅优化灌管理无法同时降低初始污染较低的土壤中As和Cd的谷物.
土壤的特性,如可降解的As,可用的Cd,pH,可用的S和有机物是管理大米中As和Cd风险的关键因素.
需要进一步的研究,以将土壤特性与灌策略相结合,以有效地减轻大米中的重金属.

关键词:

有氧米是一种有氧的米.交替浸湿和干燥可以进行.地质健康 (Geohealth) 是一个非常重要的领域.微量金属微量金属微量金属水资源管理水资源管理

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