Rice (Oryza sativa L.) readily accumulates the nutrient silicon (Si) and the toxin arsenic (As), elements that can interact antagonistically both in the plant and in the soil. Thus, many studies have been performed where Si‐rich materials are incorporated into soils to increase plant‐available Si and thereby decrease plant As. However, studies have not examined the dissolution kinetics of Si from Si‐rich materials over multiple seasons and the resulting effects on rice systems. Here, we analyzed the porewater chemistry, CH₄ emissions, and rice elemental concentrations from rice paddies in Year 2 that had been amended with Si‐rich materials (silicate fertilizer, rice husk, and charred rice husk) in Year 1. After two crop cycles, plant‐available Si and plant Si concentrations remained elevated in Si‐amended paddies. Silicon‐rich amendments also decreased plant As concentrations, although this effect was only observed in the vegetative tissues. Husk treatment resulted in the lowest porewater redox, highest CH₄ emissions, and highest porewater inorganic As. Porewater concentrations and dynamics of inorganic As, dimethylarsinic acid (DMA), and trimethylarsine oxide (TMAO) differed for each amendment, but Si‐rich amendments exhibited elevated inorganic and organic As early in the growing season. These Si‐rich amendments can continue to provide Si and impact rice systems two growing seasons after application.

中文翻译：

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稻田中富含硅的改良剂的残留效应

水稻（Oryza sativa L.）很容易积聚营养硅（Si）和毒素砷（As），这些元素可以在植物和土壤中产生拮抗作用。因此，已经进行了许多研究，其中将富含硅的材料掺入土壤中以增加植物体内可利用的硅，从而降低植物的砷。但是，研究尚未研究多个季节中富硅材料中硅的溶解动力学及其对稻米系统的影响。在这里，我们分析了孔隙水化学CH ₄第1年用富含硅的材料（硅肥，稻壳和炭化稻壳）对第2年稻田的排放和稻米中的元素浓度进行了修正。经过两个作物周期后，植物可获得的Si和植物Si的浓度在硅改良稻田中仍保持较高水平。尽管仅在营养组织中观察到了这种作用，但富含硅的改良剂也降低了植物的As浓度。稻壳处理导致最低的孔隙水氧化还原度，最高的CH ₄排放量最高的孔隙水中无机砷。每种修饰物的孔隙水浓度和无机砷，二甲基ar酸（DMA）和三甲基ar氧化物（TMAO）的动力学都不同，但是富含硅的修饰物在生长季节初期显示出较高的无机和有机砷。这些富含硅的改良剂可在施用后的两个生长季节继续提供硅，并影响水稻系统。