Soil pore structure shaped compositions and structures of soil microbial community during 13 C-labelled maize straw decomposition

文献类型： 外文期刊

第一作者： Ding, Tianyu

作者： Ding, Tianyu;Qian, Rui;Guo, Zichun;Huang, Xianjin;Peng, Xinhua;Qian, Rui;Ding, Tianyu;Qian, Rui;Huang, Xianjin;Peng, Xinhua

作者机构：

关键词： Soil pore structure; Straw decomposition; Microbial communities; X-ray micro-computed tomography (mu CT); C-13-phospholipid fatty acids (C-13-PLFAs)

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.0； 五年影响因子：5.4 ）

ISSN： 0929-1393

年卷期： 2024 年 204 卷

页码：

收录情况： SCI

摘要： Soil pore structure regulates water movement, gas exchange and determines the heterogeneous distribution of nutrients, thereby exerting significant influence on microorganisms. However, the specific contributions and limitations of pores of different sizes on soil microbial communities during straw decomposition, as well as the variations in pore structure throughout this process, remain unknown. To address this, a 57-day soil incubation experiment was conducted, using( 13)C-labelled maize straw with two soil types: Shajiang black soil (Vertisols) and Fluvo-aquic soil (Cambisols). The experiment was set at two bulk densities: 1.2 g cm-3 and 1.5 g cm-3. The variations in pore structure before and after the incubation experiment were quantified using X-ray microcomputed tomography (mu CT). To analyze microbial C content from straw, C-13-Phospholipid fatty acids ((CPLFAs)-C-13) were used, and 16S rDNA high-throughput sequencing was employed to determine bacterial community structure after the incubation. The resulted showed that Shajiang black soil exhibited a 50.5 % increase of total PLFA-C content from straw than Fluvo-aquic soil at a bulk density of 1.5 g cm- 3 (P < 0.05). Specifically, Grampositive bacteria (G+), Gram-negative bacteria (G-) and actinobacteria PLFA-C content increased by 105.2 %, 55.0 % and 73.6 % (P < 0.05). Redundancy analysis (RDA) showed that >100 mu m pores in diameter (& Oslash;) facilitated the colonization of microorganisms (G+, G- and actinobacteria). Specifically, bacteria (including G+, G-, and common bacteria, accounted for 37.6 %, 15.7 % and 22.1 % of straw-derived PLFA-C in relation to the total amount of straw-enriched PLFA-C) were key contributors to straw decomposition and were associated with the formation of 50-200 mu m & Oslash; pores. Meanwhile, fungal activity was primarily responsible for changes in the 20-50 mu m & Oslash; pore structure. These findings emphasize that >100 mu m & Oslash; pores created a favorable physical environment for microbial communities on straw decomposition, highlighting the pivotal role of microbial activity in shaping soil pore structure.

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