数字农科院2.0

Long-term nitrogen fertilization promotes fresh particulate organic matter accumulation within macroaggregates under straw return by increasing pore connectivity

文献类型： 外文期刊

作者： Tianyu Ding;Zichun Guo;Wei Li;Huan Fang;Lei Gao;Xinhua Peng

作者机构：

关键词： Nitrogen fertilization;Particulate organic matter (POM);Soil macroaggregate;Soil pore structure;Straw management;X-ray computed tomography (CT)

期刊名称： Soil and Tillage Research

ISSN： 0167-1987

年卷期： 2025 年 256 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Protection of soil carbon (C) within macroaggregates largely depends on their pore characteristics. However, the influence of pore structures on particulate organic matter (POM) stabilization under long-term nitrogen (N) fertilization and straw management is not well understood. This study examined the effects of N fertilization and straw management on soil pore structures and POM distribution within macroaggregates in a Vertisol after an 11-year field experiment. Three N rates (0, 360, and 540 kg ha−1year−1, referred to N0, N360, and N540) and two straw management treatments (straw return and straw removal) were tested in a wheat-maize cropping system. X-ray computed tomography (CT) was used to quantify pore structures and classify POM as fresh or decomposed POM based on its morphological features within 3–5 mm macroaggregates. Results showed that long-term N fertilization under straw return significantly increased the proportion of 3–5 mm aggregates, fresh POM volume density, mesoporosity, image-based porosity (> 14 μm) and pore surface area density compared to the N0 treatment (P < 0.05). Connected pores were the primary site for fresh POM distribution, accounting for 68–75 % under straw return. Strong correlations were observed between POM volume density and connected porosity, bioporosity, mesoporosity (30–100 μm) under straw return. Our results emphasize the critical role of pore connectivity in stabilizing fresh POM and suggest that N fertilization combined with straw return enhances POM accumulation and improves soil structure in Vertisols.

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