Dispersal changes soil bacterial interactions with fungal wood decomposition

Author:

Wang Cong12,Smith Gabriel Reuben34ORCID,Gao Cheng1,Peay Kabir G45ORCID

Affiliation:

1. State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences , 100101 Beijing, China

2. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences , Guangzhou 510650, China

3. Global Ecosystem Ecology, Department of Environmental Systems Science, Institute of Integrative Biology, ETH Zürich , Zürich 8092, Switzerland

4. Department of Biology, Stanford University , Stanford, CA 94305, USA

5. Department of Earth System Science, Stanford University , Stanford, CA 94305, USA

Abstract

Abstract Although microbes are the major agent of wood decomposition - a key component of the carbon cycle - the degree to which microbial community dynamics affect this process is unclear. One key knowledge gap is the extent to which stochastic variation in community assembly, e.g. due to historical contingency, can substantively affect decomposition rates. To close this knowledge gap, we manipulated the pool of microbes dispersing into laboratory microcosms using rainwater sampled across a transition zone between two vegetation types with distinct microbial communities. Because the laboratory microcosms were initially identical this allowed us to isolate the effect of changing microbial dispersal directly on community structure, biogeochemical cycles and wood decomposition. Dispersal significantly affected soil fungal and bacterial community composition and diversity, resulting in distinct patterns of soil nitrogen reduction and wood mass loss. Correlation analysis showed that the relationship among soil fungal and bacterial community, soil nitrogen reduction and wood mass loss were tightly connected. These results give empirical support to the notion that dispersal can structure the soil microbial community and through it ecosystem functions. Future biogeochemical models including the links between soil microbial community and wood decomposition may improve their precision in predicting wood decomposition.

Publisher

Oxford University Press (OUP)

Subject

General Medicine

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