Two key features influencing community assembly processes at regional scale: Initial state and degree of change in environmental conditions

Feng, Youzhi; Chen, Ruirui; Stegen, James C.; Guo, Zhiying; Zhang, Jianwei; Li, Zhongpei; Lin, Xiangui

doi:10.1111/mec.14914

Two key features influencing community assembly processes at regional scale: Initial state and degree of change in environmental conditions

Journal Article · Sat Nov 24 23:00:00 EST 2018 · Molecular Ecology

DOI:https://doi.org/10.1111/mec.14914· OSTI ID:1483322

Feng, Youzhi ^[1]; Chen, Ruirui ^[1]; Stegen, James C. ^[2]; Guo, Zhiying ^[1]; Zhang, Jianwei ^[1]; Li, Zhongpei ^[1]; ^[1]

State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing China
Earth and Biological Sciences Directorate Ecosystem Sciences Team Pacific Northwest National Laboratory Richland Washington

Abstract

Belowground microbial communities strongly influence ecosystem function such that predicting function may rely on understanding ecological processes that assemble communities. Uncertainty remains, however, in what governs the relative contributions of different ecological processes. To help fill this knowledge gap, we test the general hypothesis that both initial state and degree of change in environmental conditions govern the relative contributions of different ecological assembly processes. To do so, we leveraged regional‐scale nutrient and organic matter addition experiments and used soil organic matter (SOM) as a proxy of integrated soil environmental conditions. Consistent with our hypothesis, we found that both the initial amount of SOM and the degree of change in SOM—in response to nutrient addition—influenced the relative contributions of different ecological assembly processes. These influences were most clearly observed at the regional scale, suggesting potential scale dependence. More specifically, nutrient additions homogenized bacterial community composition due to enhanced influences of homogenizing dispersal when SOM content was initially high. In contrast, nutrient additions led to divergence in community composition due to variable selection when initial SOM was low and/or when SOM increased significantly in response to nutrient additions. Our findings indicate important connections among initial conditions, degree of change in environmental variables and microbial community assembly processes that may influence ecosystem processes. These conceptual inferences highlight a need to strengthen connections between ecological theory and biogeochemical modelling.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1483322

Alternate ID(s):: OSTI ID: 1494611

Journal Information:: Molecular Ecology, Journal Name: Molecular Ecology Journal Issue: 24 Vol. 27; ISSN 0962-1083

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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