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Organic fertilizer intensifies the vertical heterogeneity of DOM in paddy fields through interactions with soil minerals
Soil and Tillage Research ( IF 6.1 ) Pub Date : 2025-01-18 , DOI: 10.1016/j.still.2025.106454
Yi Xiao, Rong Huang, Weiliang Xiong, Binbin Liu, Qinghua Zhou, Tao Jiang, Vanessa N.L. Wong, Jiang Liu, Yingjie Wu, Youlin Luo, Qiquan Li, Qiang Xu, Ting Lan, Changquan Wang, Bing Li

Dissolved organic matter (DOM) is a complicated soluble organic composite in soils that is known to be linked to carbon turnover, nutrient cycling, and climate change. However, uncertainties exist about the potential influence of soil Fe and Mn oxides on DOM characteristics in paddy soil profiles following the application of inorganic and organic fertilizers. We investigated the DOM characteristics in a paddy soil profile (0–40 cm) treated with inorganic and organic fertilizers and the relationships between DOM and Fe and Mn oxides. The paddy soils were subjected to four fertilizer treatments: a control with no fertilizer (CK), inorganic fertilizer only (NPK), 50 % chemical N substituted with organic fertilizer (NPKM), and 100 % chemical N substituted with organic fertilizer (M). Ultravioletvisible (UVVis) spectroscopy and fluorescence excitation-emission matrix (EEM) spectrophotometry were integrated to explore the vertical variation in the DOM. There were no significant differences in the DOM content between the surface soil (0–20 cm) and the subsurface soil (20–40 cm) under the CK, NPK, and NPKM treatments. However, the DOM content significantly increased with soil depth under the M treatment. The application of organic fertilizer resulted in a significant reduction in the aromaticity and hydrophobic components of the DOM, as well as the fluorescence intensity of the humic-like and protein-like components with increasing soil depth; the content of easily reducible Fe significantly increased, whereas the total Mn and reducible Mn contents significantly decreased with increasing soil depth. The addition of organic fertilizer increased the vertical variation in the DOM characteristics of the paddy soil profiles. The consistency and correlation analysis of the DOM and Fe and Mn oxide contents in the profile indicated that Fe and Mn oxides might be the main influencing factors of DOM vertical heterogeneity, which was mediated by the weakening of mineral protection and the increase in the degree of mineral dissimilar reduction with increasing soil depth.

中文翻译:


有机肥通过与土壤矿物质的相互作用加剧了 DOM 在稻田中的垂直异质性



溶解有机物 (DOM) 是土壤中一种复杂的可溶性有机复合材料,已知与碳周转、养分循环和气候变化有关。然而,施用无机和有机肥料后土壤 Fe 和 Mn 氧化物对水稻土壤剖面 DOM 特性的潜在影响存在不确定性。我们研究了无机和有机肥料处理的水稻土剖面 (0–40 cm) 中的 DOM 特性以及 DOM 与 Fe 和 Mn 氧化物之间的关系。对水稻土进行 4 次肥料处理:无肥对照 (CK)、仅无机肥 (NPK)、50% 化学氮替代有机肥 (NPKM) 和 100% 化学氮替代有机肥 (M)。将紫外可见光 (UVVis) 光谱和荧光激发-发射矩阵 (EEM) 分光光度法相结合,探讨 DOM 的垂直变化。在 CK、NPK 和 NPKM 处理下,表层土壤 (0–20 cm) 和地下土壤 (20–40 cm) 的 DOM 含量无显著差异。而 M 处理下 DOM 含量随土层深度的增加而显著增加。随着土壤深度的增加,有机肥的施用导致 DOM 的芳香性和疏水性成分以及腐殖质样和蛋白质样成分的荧光强度显著降低;随着土层深度的增加,易还原铁含量显著增加,而总Mn和可还原Mn含量显著降低。有机肥的添加增加了水稻土壤剖面 DOM 特性的垂直变化。 剖面中DOM与Fe、Mn氧化物含量的一致性和相关性分析表明,Fe和Mn氧化物可能是DOM垂直异质性的主要影响因素,其介导因素是矿物保护作用减弱,矿物异化还原程度随土层深度的增加而介导的。
更新日期:2025-01-18
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