期刊
MOLECULAR ECOLOGY
卷 27, 期 24, 页码 5238-5251出版社
WILEY
DOI: 10.1111/mec.14914
关键词
community assembly; deterministic; microbial ecology; null models; soil bacterial community; soil organic matter; stochastic
资金
- US Department of Energy
- National Natural Science Foundation of China [41430859, 41671267]
- CAS Strategic Priority Research Program [KFZD-SW-112-03-04, XDB15010103, XDB15020103]
- National Basic Research Program [2014CB954500]
- National Key RD Program [2016YFD0200306]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2014271]
- Knowledge Innovation Program of Chinese Academy of Sciences [ISSASIP1639]
- Office of Biological and Environmental Research Program's Scientific Focus Area
- Office of Biological and Environmental Research
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.
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