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New insights into carbon mineralization in tropical paddy soil under land use conversion: Coupled roles of soil microbial community, metabolism, and dissolved organic matter chemodiversity

文献类型： 外文期刊

作者： Wu, Dongming 1 ; Ren, Changqi 2 ; Ren, Dong 3 ; Tian, Yingjie 3 ; Li, Youping 3 ; Wu, Chunyuan 1 ; Li, Qinfen 1 ;

作者机构： 1.Minist Key Lab Low Carbon Green Agr Trop Reg China, Haikou, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Hainan Key Lab trop Ecocirculing Agr, Haikou 571101, Peoples R China

3.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 571101, Peoples R China

4.China West Normal Univ, Coll Environm Sci & Engn, Nanchong 637009, Peoples R China

5.Natl Agr Expt Stn Agr Environm, Natl Observat & Res Stn, Trop Agroecosystem, Danzhou 571737, Peoples R China

6.Hainan Engn Res Ctr Nonpoint Source & Heavy Met Po, Haikou 571101, Peoples R China

7.4 Xueyuan Rd, Haikou 571101, Hainan, Peoples R China

关键词： Land use conversion; Soil carbon mineralization; Microbial community; DOM chemodiversity; Microbial metabolism strategy

期刊名称：GEODERMA （ 影响因子：6.1； 五年影响因子：7.0 ）

ISSN： 0016-7061

年卷期： 2023 年 432 卷

页码：

收录情况： SCI

摘要： Although the impact of land conversion on carbon mineralization in paddy soils has received increasing atten-tion, the coupled roles of soil microdiversity and chemodiversity in these processes are largely unknown. To address this issue, the land use conversion from paddy fields (PF) to vegetable fields (VF), rice-vegetable rotation (RV), and abandoned land (AL), were investigated in this study. The relationships between soil mineralization characteristics and microbial community, metabolism physiology and dissolved organic matter (DOM) chemo-diversity were analyzed. After the conversion, soil mineralization enhanced in AL and RV, which were 217.49% and 183.02% of that in PF. In contrast, no significant change was observed in VF, although the anaerobic environment was transformed into an aerobic one and the fungal richness/ diversity increased in the soil. This was because soil mineralization was directly regulated by DOM quantity and microbial metabolism of labile carbon, and indirectly by DOM chemodiversity and microbial community. Specifically, the largest mineralization in AL was attributed to the strongest microbial metabolism of labile carbon, as AL had the largest DOC contents, hydrophilic substances (e.g., carboxyl, carbohydrate, and amino), and abundant eutrophic taxa (e.g., Actino-bacteria and Proteobacteria). In contrast, no significant change in VF was mainly related to more condensed ar-omatics and oligotrophic microbes, and fewer DOC in soil, resulting in the dominance of microbial metabolism of soil recalcitrant carbon. The recalcitrant carbon metabolism also prevailed in RV. However, RV showed moderate soil mineralization due to having the proper DOM with high bioavailability. Collectively, the results provide molecular insights into the impact of land conversion on soil mineralization from a micro-chemodiversity perspective, which highlights the importance of nutrient supply and microbial metabolism strategy.

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