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Microbial carbon metabolic activity and bacterial cross-profile network in paddy soils of different fertility

文献类型： 外文期刊

作者： Gao, Guozhen 1 ; Li, Guilong 3 ; Liu, Ming 1 ; Liu, Jia 3 ; Ma, Shiyu 5 ; Li, Daming 6 ; Liang, Xiaomin 7 ; Wu, Meng 1 ; Li, Zhongpei 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Jiangxi Acad Agr Sci, Soil & Fertilizer & Resources & Environm Inst, Nanchang 330200, Peoples R China

4.Acad Sinica, Natl Engn & Technol Res Ctr Red Soil Improvement, Ecol Expt Stn Red Soil, Yingtan 335211, Peoples R China

5.Henan Agr Univ, Coll Life Sci, Zhengzhou 450046, Peoples R China

6.Jiangxi Inst Red Soil, Jinxian 331700, Peoples R China

7.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China

关键词： Paddy soil; Microbial carbon metabolic activity; Cross-profile network; Bacterial interactions; Soil profile

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.8； 五年影响因子：5.1 ）

ISSN： 0929-1393

年卷期： 2024 年 195 卷

页码：

收录情况： SCI

摘要： Soil microbial carbon metabolic activity is critical to the carbon balance of terrestrial ecosystems. How the microbial interactions induce microbial carbon metabolic activity in rice-based ecosystems at different fertility levels are unclear. Here, we investigated the association of microbial carbon metabolic activity with soil phys-icochemical properties, microbial diversity and interactions at three fertilization practices and four soil profile levels (0-10 cm, 10-20 cm, 20-40 cm, 40-60 cm) in two paddy soils with different fertility levels. Our results found that microbial carbon metabolic activity and content of soil nutrient increased with fertilizer application practices but decreased with increasing soil depth. We provide an effective tool for studying microbial in-teractions across the soil profiles named cross-profile network model. The cross-profile showed that 10-20 cm had the highest average degree of edges and nodes in the co-occurrence network. The network indicated that the combination of organic and inorganic fertilizers increased the number of nodes and edges, while the single application of organic fertilizers decreased the number of nodes and edges in fertile soil. The taxonomic diversity of microorganisms and the carbon-related functional diversity were significantly correlated with microbial in-teractions by linear/non-linear fitted models. Partial least squares path modeling showed that microbial carbon metabolic activity in fertile soil was directly affected by dissolved organic carbon. However, soil physicochemical properties indirectly affected the carbon metabolic activity by mediating microbial diversity and interactions in infertile soil. For the first time, we incorporated potential microbial interactions between soil layers into a network model, emphasizing the importance of microbial diversity and interactions in regulating carbon metabolism activities. Our results pave the way for the integration of bacterial community diversity and in-teractions to the predict soil organic carbon dynamics.

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