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首页> 外文期刊>Environmental Science & Technology >Growing Rice Aerobically Markedly Decreases Arsenic Accumulation
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Growing Rice Aerobically Markedly Decreases Arsenic Accumulation

机译：水稻有氧种植显着减少了砷的积累

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Arsenic (As) exposure from consumption of rice can be substantial, particularly for the population on a subsistence rice diet in South Asia. Paddy rice has a much enhanced As accumulation compared with other cereal crops, and practical measures are urgently needed to decrease As transfer from soil to grain. We investigated the dynamics of As speciation in the soil solution under both flooded and aerobic conditions and compared As accumulation in rice shoot and grain in a greenhouse experiment. Flooding of soil led to a rapid mobilization of As, mainly as arsenite, in the soil solution. Arsenic concentrations in the soil solution were 7-16 and 4-13 times higher under the flooded than under the aerobic conditions in the control without As addition and in the +As treatments (10 mg As kg~(-1) as arsenite or arsenate), respectively. Arsenate was the main As species in the aerobic soil. Arsenic accumulation in rice shoots and grain was markedly increased under flooded conditions; grain As concentrations were 10-15-fold higher in flooded than in aerobically grown rice. With increasing total As concentrations in grain, the proportion of inorganic As decreased, while that of dimethylarsinic acid (DMA) increased. The concentration of inorganic As was 2.6-2.9 fold higher in the grain from the flooded treatment than in that from the aerobic treatment. The results demonstrate that a greatly increased bioavailability of As underthe flooded conditions is the main reason for an enhanced As accumulation by flooded rice, and growing rice aerobically can dramatically decrease the As transfer from soil to grain.
机译：食用大米可能会暴露大量砷，特别是对于南亚以大米为生的饮食人群而言。与其他谷类作物相比，水稻的As积累量大大提高，因此迫切需要采取实际措施来减少As从土壤向谷物的转移。我们研究了在淹水和有氧条件下土壤溶液中砷形态的动态变化，并通过温室试验比较了稻苗和谷物中砷的积累。土壤的洪水导致土壤溶液中砷（主要是砷）的快速迁移。在不添加As和+ As处理（10 mg As kg〜（-1）作为砷酸盐或砷酸盐）的情况下，淹水后土壤溶液中的砷浓度分别比有氧条件下高7-16倍和4-13倍。 ）， 分别。砷酸盐是好氧土壤中主要的砷形态。在淹水条件下，水稻芽和谷物中的砷积累显着增加。淹水谷物中的砷浓度比需氧栽培稻米高10-15倍。随着谷物中总As浓度的增加，无机As的比例降低，而二甲基砷酸（DMA）的比例增加。淹水处理后的谷物中无机砷的含量比需氧处理后的谷物高2.6-2.9倍。结果表明，淹水条件下砷的生物利用度大大提高是淹水水稻提高砷积累的主要原因，有氧水稻的生长可以显着降低砷从土壤向谷物的转移。

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