Interaction between POM and pore structure during straw decomposition in two soils with contrasting texture

文献类型： 外文期刊

第一作者： Ding, Tianyu

作者： Ding, Tianyu;Guo, Zichun;Qian, Yongqi;Jiang, Fahui;Zhang, Zhongbin;Peng, Xinhua;Wang, Yuekai;Jiang, Fahui;Ding, Tianyu;Qian, Yongqi;Zhang, Zhongbin;Peng, Xinhua

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关键词： Soil structure; Particulate organic matter; Straw decomposition; X-ray micro-computed tomography (mu CT); Pore structure

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：6.8； 五年影响因子：7.8 ）

ISSN： 0167-1987

年卷期： 2025 年 245 卷

页码：

收录情况： SCI

摘要： Particulate organic matter (POM) decomposition is influenced by soil pore structure, and the volume loss associated with POM decomposition might also promote the generation of new pores. However, the interaction between POM decomposition and soil pore structure remains unclear. Therefore, the objective of this study was to explore this interaction during straw decomposition. A 57-day soil incubation experiment was conducted using C-13-labelled maize straw in both Shajiang black soil and Fluvo-aquic soil, with two bulk densities (1.2 g/cm(3), T1.2 and 1.5 g/cm(3), T1.5). The loss of POM volume and the changes in soil pore structure, both before and after the incubation experiment, were quantified using X-ray micro-computed tomography (mu CT). The results showed that there was a significantly greater volume loss of POM in Shajiang black soil (POM volume loss: 58.2-75.0 %) compared to Fluvo-aquic soil (34.0 %). Within the Shajiang black soil, decomposition of POM and the release of respired (CO2)-C-13 were notably higher in the soil from the T1.2 treatment compared to the T1.5 treatment (P<0.05), while no significant difference was observed in Fluvo-aquic soil. Image-based porosity and mean pore distance emerged as primary determinants of POM variations in Shajiang black soil. Furthermore, our results underscore the positive role of pores ranging from 50 to 300 mu m in diameter (& Oslash;) in facilitating rapid POM decomposition, as evidenced by a higher (CO2)-C-13 release. In Shajiang black soil, POM decomposition increased the porosity of 100-200 mu m, 200-300 mu m, and >300 mu m & Oslash; pores by 26.2 %, 51.8 % and 82.9 %, respectively, in the T1.2 treatment (P<0.05), and 50-100 mu m & Oslash; pores by 24.7 % in the T1.5 treatment (P<0.05). Our findings emphasize the significance of 100-300 mu m & Oslash; pores in gas transport and fresh POM decomposition, highlighting the pivotal role of POM decomposition in shaping soil pore structure.

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