Organic manure rather than chemical fertilization improved dark CO2 fixation by regulating associated microbial functional traits in upland red soils

文献类型： 外文期刊

第一作者： Wang, Qian

作者： Wang, Qian;Liu, Mengmeng;Huang, Jingshi;Han, Cheng;Jiang, Yunbin;Zhong, Wenhui;Han, Cheng;Deng, Huan;Zhong, Wenhui;Han, Cheng;Jiang, Yunbin;Zhong, Wenhui;Deng, Huan;Liu, Kailou

作者机构：

关键词： Acidic upland soil; Metagenomics; Metabolic pathways; Acidic upland soil; CO2 fixation; Metagenomics; Metabolic pathways

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.0； 五年影响因子：8.7 ）

ISSN： 0048-9697

年卷期： 2024 年 954 卷

页码：

收录情况： SCI

摘要： Dark microbial fixation of CO2 is an indispensable process for soil carbon sequestration. However, the whole genetic information involved in dark CO(2 )fixation and its influence on dark CO2 fixation rates under diversified fertilization regimes were largely unclear. Here, revealed by( 13 )C- CO2 labeling, dark CO(2 )fixation rates in upland red soils ranged from 0.029 mg kg(- 1 )d(- 1 )to 0.092 mg kg(- 1 )d(-1), and it was 75.49 % higher (P < 0.05) in organic manure (OM) soil but 44.2 % decline (P < 0.05) in chemical nitrogen fertilizer (N) soil compared to unfertilized (CK) soil. In addition, the normalized abundance and Chao1 index of dark CO2 fixation genes (KO level) were significantly different between OM and N soils, showing the highest and lowest, respectively. And they were positively (P < 0.05) correlated with dark CO2 fixation rate. Besides, among the identified CO2 fixation pathways in this study, the DC/4-HB cycle (M00374) was enriched in OM soil, yet the 3-HP cycle (M00376) was enriched in N soil, and their relative abundances were positively and negatively correlated (P < 0.05) with dark CO2 fixation rate, respectively. The PLS-SEM analysis revealed that dark CO2 2 fixation-related functional traits (i.e. normalized abundance, Chao1 index and gene composition) were directly and positively associated with dark CO2 fixation rate, and organic manure could exert a positive effect on soil dark CO2 fixation rate through enhancing soil properties (e.g., pH and soil organic carbon) and further altering associated microbial functional traits. These results have implications for explaining and predicting the soil CO2 fixation process from the perspective of microbial functional potential.

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