Increase in more stable iron-organic carbon associations by swine slurry application in paddy soils
文献类型： 外文期刊
作者： Ma, Yingjun 1 ; Wang, Xiaofei 2 ; Zhang, Keqiang 1 ; Chang, Xingping 1 ; Zhang, Mingye 1 ; Li, Zhuowu 1 ; Liu, Fuyuan 4 ; Gao, Xingliang 4 ; Du, Lianzhu 1 ;
作者机构： 1.Minist Agr & Rural Affairs, Agroenvironm Protect Inst, Tianjin 300191, Peoples R China
2.Henan Acad Agr Sci, Inst Plant Nutr Agr Resources & Environm Sci, Zhengzhou 450002, Henan, Peoples R China
3.Minist Agr & Rural Affairs, Key Lab Low Carbon Green Agr North China, Beijing 100193, Peoples R China
4.Xinjiang Acad Agr & Reclamat Sci, State Key Lab Sheep Genet Improvement & Hlth Prod, 221 Wuyi Rd, Shihezi 2553960, Peoples R China
关键词： Redox fluctuations; Organic carbon; Iron; Swine slurry; Paddy soil; Hydroxyl radical
期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）
ISSN： 2352-1864
年卷期： 2025 年 38 卷
页码：
收录情况： SCI
摘要： Swine slurry (SS) application, recognized as a green and sustainable agricultural practice, has attracted greater attention. However, applying SS to farmland often leads to fluctuations in soil redox conditions and changes in soil properties. The biotic and abiotic transformations of iron (Fe) phases and associated organic carbon (OC) induced by SS remain unclear, especially in iron-rich paddy soils. Herein, SS was infused into paddy soil and conducted three cycles of redox fluctuation incubation. The findings demonstrated that SS slowed the transition from low-crystalline to highly crystalline Fe phases, particularly hindering the accumulation of haematite. SS reduced the formation potential of hydroxyl radicals (& sdot;OH) by influencing ligandcomplexed Fe(II) and dissolved phenols (DP). It was notable that SS enhanced the content of more stable complexes, which may be formed by the combination of highly crystalline Fe phases and aliphatic OC. Concurrently, the protection of aromatic OC by low-crystalline Fe phases increased. The increase of these two complexes is key to significantly improving the stable SOC pool. Moreover, SS promoted the enrichment of Clostridium_sensu_stricto_1, causing the soil more inclined to use easily decomposable OC (such as carbohydrates) as electron donors for the reduction of low-crystalline Fe phases. In summary, SS application influences Fe and OC cycling in paddy soil through both biotic and abiotic pathways, while also presenting considerable potential for enriching the stable soil organic carbon (SOC) pool over the long term.
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