Tillage Intensity and Corn Straw Residues Alter the Composition of Dissolved and Mineral-Associated Organic Matter Formation: Evidence from Fluorescence and Ultraviolet-Visible Spectroscopy

文献类型： 外文期刊

第一作者： Ndzelu, Batande Sinovuyo

作者： Ndzelu, Batande Sinovuyo;Ntagisanimana, Gilbert;Zhang, Xiaowei;Tikwayo, Sizwe Edward;Dou, Sen

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关键词： Dissolved organic carbon; no-till; soil organic matter; spectroscopic characteristics

期刊名称：COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS （ 影响因子：1.4； 五年影响因子：1.8 ）

ISSN： 0010-3624

年卷期： 2025 年 56 卷 16 期

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收录情况： SCI

摘要： Dissolved organic matter (DOM) influences many fundamental soil biogeochemical processes, and its interaction with soil minerals facilitates the formation of mineral-associated organic matter (MAOM). However, it is not clear which property of DOM (plant- or microbial-derived) forms MAOM, especially in the context of different tillage systems. This five-year field experiment investigates how different tillage systems affect the composition of DOM and the source of MAOM. The tillage systems examined were conventional tillage without corn straw (CT), conventional tillage (CT+S), minimum tillage (MT+S), and no-tillage (NT+S) with corn straw returned on different depths. DOM molecular composition and the source of MAOM, analyzed by ultraviolet-visible and fluorescence spectroscopy, varied with soil depth and tillage systems. DOM in the 0-20 cm depth was more aromatic and hydrophobic compared to the 20-40 cm. Irrespective of the tillage system, DOM extracted from the MAOM fraction consisted mostly of microbial-processed compounds with lower molecular weight. In contrast, DOM extracted from the bulk soil was enriched in aromatic, hydrophobic, and high molecular weight materials, with the greatest enrichment more pronounced under the NT+S and MT+S systems compared to CT. The increase in microbial-processed compounds in MAOM was associated with greater accrual of soil organic carbon content. Such an increase in soil organic carbon content was more prevalent under NT+S and MT+S soils compared to CT, rendering these tillage practices important for carbon sequestration.

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