Long-term Application of Agricultural Amendments Regulate Hydroxyl Radicals Production during Oxygenation of Paddy Soils

文献类型： 外文期刊

第一作者： Chen, Ning

作者： Chen, Ning;Huang, Danyu;Liu, Xiantang;Zhou, Dongmei;Chen, Ning;Zeng, Yu;Wu, Tongliang;Fang, Guodong;Wang, Yujun;Wang, Juan;Liu, Guangxia;Gao, Yan

作者机构：

关键词： agricultural amendment; hydroxyl radicals; soil aggregate fractionation, paddy soil; organic contaminantattenuation

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：10.8； 五年影响因子：11.6 ）

ISSN： 0013-936X

年卷期： 2024 年 58 卷 30 期

页码：

收录情况： SCI

摘要： Hydroxyl radicals ((OH)-O-center dot) play a significant role in contaminant transformation and element cycling during redox fluctuations in paddy soil. However, these important processes might be affected by widely used agricultural amendments, such as urea, pig manure, and biochar, which have rarely been explored, especially regarding their impact on soil aggregates and associated biogeochemical processes. Herein, based on five years of fertilization experiments in the field, we found that agricultural amendments, especially coapplication of fertilizers and biochar, significantly increased soil organic carbon contents and the abundances of iron (Fe)-reducing bacteria. They also substantially altered the fraction of soil aggregates, which consequently enhanced the electron-donating capacity and the formation of active Fe(II) species (i.e., 0.5 M HCl-Fe(II)) in soil aggregates (0-2 mm), especially in small aggregates (0-3 mu m). The highest contents of active Fe(II) species in small aggregates were mainly responsible for the highest (OH)-O-center dot production (increased by 1.7-2.4-fold) and naphthalene attenuation in paddy soil with coapplication of fertilizers and biochar. Overall, this study offers new insights into the effects of agricultural amendments on regulating (OH)-O-center dot formation in paddy soil and proposes feasible strategies for soil remediation in agricultural fields, especially in soils with frequent occurrences of redox fluctuations.

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