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首页> 美国卫生研究院文献>Springer Open Choice >Temporal variability in trace metal solubility in a paddy soil not reflected in uptake by rice (Oryza sativa L.)
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Temporal variability in trace metal solubility in a paddy soil not reflected in uptake by rice (Oryza sativa L.)

机译：稻田土壤中微量金属溶解度的时间变化没有反映在水稻的吸收中（Oryza sativa L.）

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摘要

Alternating flooding and drainage conditions have a strong influence on redox chemistry and the solubility of trace metals in paddy soils. However, current knowledge of how the effects of water management on trace metal solubility are linked to trace metal uptake by rice plants over time is still limited. Here, a field-contaminated paddy soil was subjected to two flooding and drainage cycles in a pot experiment with two rice plant cultivars, exhibiting either high or low Cd accumulation characteristics. Flooding led to a strong vertical gradient in the redox potential (Eh). The pH and Mn, Fe, and dissolved organic carbon concentrations increased with decreasing Eh and vice versa. During flooding, trace metal solubility decreased markedly, probably due to sulfide mineral precipitation. Despite its low solubility, the Cd content in rice grains exceeded the food quality standards for both cultivars. Trace metal contents in different rice plant tissues (roots, stem, and leaves) increased at a constant rate during the first flooding and drainage cycle but decreased after reaching a maximum during the second cycle. As such, the high temporal variability in trace metal solubility was not reflected in trace metal uptake by rice plants over time. This might be due to the presence of aerobic conditions and a consequent higher trace metal solubility near the root surface, even during flooding. Trace metal solubility in the rhizosphere should be considered when linking water management to trace metal uptake by rice over time.
机译：交替的洪水和排水条件对氧化还原化学和稻田土壤中痕量金属的溶解度有很大影响。但是，目前关于水管理对微量金属溶解度的影响如何与水稻植物随时间吸收微量金属有关的当前知识仍然有限。在这里，在两个水稻品种的盆栽试验中，田间污染的水稻土经受了两次淹水和排水循环，表现出高或低的Cd积累特性。水淹导致氧化还原电势（Eh）的垂直梯度很大。 pH和Mn，Fe和溶解的有机碳浓度随Eh的降低而增加，反之亦然。驱油过程中，痕量金属的溶解度显着下降，这可能是由于硫化物矿物沉淀所致。尽管其溶解度较低，但两种谷物中的Cd含量均超过了食品质量标准。在第一个洪水和排水周期中，不同水稻植物组织（根，茎和叶）中的痕量金属含量以恒定的速率增加，但在第二个周期中达到最大值后降低。这样，随着时间的流逝，水稻植物对痕量金属的吸收并未反映出痕量金属溶解度的高时间变异性。这可能是由于有氧条件的存在，以及甚至在浸水期间根表面附近较高的痕量金属溶解度所致。将水管理与水稻随时间吸收的痕量金属联系起来时，应考虑到根际中的痕量金属溶解度。

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