The effect of rice residue management on rice paddy Si, Fe, As, and methane biogeochemistry
The effect of rice residue management on rice paddy Si, Fe, As, and methane biogeochemistry
复制标题
稻渣管理对稻田硅、铁、砷和甲烷生物地球化学的影响
DOI：
10.1016/j.scitotenv.2023.166496
复制
发表时间：
2023
影响因子：
9.8
通讯作者：
Seyfferth, Angelia L.
中科院分区：
文献类型：
--
作者：
Limmer, Matt A.;Linam, Franklin A.;Seyfferth, Angelia L.
水稻生产会产生秸秆和稻壳残留物，这些残留物的管理对水稻农业生态系统的可持续性具有重要意义。稻草通常以新鲜残留物的形式掺入土壤中，或者在掺入之前燃烧。稻壳通常不会返回稻田。然而，稻壳含有高含量的硅，已被证明可以减少水稻砷的积累。在这项工作中，我们研究了两年内用稻草或燃烧稻草以及无稻壳、稻壳或燃烧稻壳对稻田进行改良时稻田土壤中所产生的生物地球化学变化。使用全因子设计，我们观察到，尽管稻壳和稻草的碳比率相似，但稻草碳控制氧化还原敏感过程的不稳定性较高。无论谷壳是否经过改良，用秸秆而不是燃烧秸秆改良稻田都会增加孔隙水铁和砷、植物砷以及甲烷排放量。尽管硅浓度较高，但添加谷壳为植物提供的硅含量微不足道，这表明硅的短期流动性有限，并且可能需要研究长期添加谷壳或更高的添加率。
Rice production results in residues of straw and husk, and the management of these residues has implications for the sustainability of the rice agroecosystem. Rice straw is typically incorporated into soil either as fresh residue or is burned prior to incorporation. Rice husk is not typically returned to rice fields. However, rice husk contains high levels of silicon, which has been shown to decrease rice accumulation of arsenic. In this work, we studied the resulting biogeochemical changes in rice paddy soils when paddies were amended with either straw or burned straw and either no husk, husk, or burned husk over two years. Using a full-factorial design, we observed that the higher lability of rice straw carbon controlled redox-sensitive processes despite the application of husk and straw at similar carbon rates. Amending paddies with straw, rather than burned straw, increased porewater Fe and As, plant As, and methane emissions regardless of husk amendment. Husk addition provided insignificant Si to the plant despite its high concentration of Si, suggesting limited short-term mobility of Si and that long-term additions of husk or higher rates may need to be studied.