期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 112, 期 -, 页码 110-116出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2017.05.005
关键词
Wood decomposition; Climate change; Fungi; Microbial; Community structure; Indirect effect; Functional traits
类别
资金
- Yale School of Forestry and Environmental Studies
- Jubitz Family Endowment for Research Internships Fund
- Carpenter-Sperry Fund
- Yale Institute for Biospheric (YIBS) Small Grant Fund
- Schiff Fund for Wildlife, Habitat and Environment
- U.S. National Science Foundation [DEB-1457614]
- Direct For Biological Sciences
- Division Of Environmental Biology [1457614] Funding Source: National Science Foundation
Functional changes to biotic communities arise in response to changes in the physical environment, often with profound implications for biogeochemical processes. Decomposition is regulated both by abiotic conditions (e.g. temperature and moisture) and by the biotic communities that mediate this process (e.g. bacteria and fungi). Given strong evolutionary trade-offs between tolerating stressful climatic conditions and competing under favorable conditions, past climate may indirectly affect decomposition rates by structuring the functional composition of microbial communities. In a controlled laboratory setting using samples from the Yale Myers Forest in northeast Connecticut USA, we tested how exposure to 15 degrees C, 20 degrees C, and 25 degrees C for three months shaped characteristics of wood-degrading fungal communities. We then measured how this indirect effect influenced contemporary decomposition rates during a second three-month incubation. As expected, contemporary effects of temperature had a strong influence on decomposition rates. Yet the effects of previous temperature exposure were also evident: fungal communities previously exposed to warmer conditions consistently decomposed wood faster than communities previously exposed to cooler conditions, regardless of the contemporary temperature regime. Across all contemporary temperatures, communities previously warmed to 20 degrees C and 25 degrees C degraded 1:08 and 1.12 times more wood, respectively, than communities previously warmed to 15 degrees C. The indirect effects of previous temperature were mediated by a larger fungal biomass in inocula sourced from warmer previous temperatures, as well as by shifts in functional rates independent of biomass. Overall, the relative influence of contemporary temperature was less than expected: the combined effect of the functional shift and fungal biomass both a product of previous temperature was nearly two-thirds that of contemporary temperature. Our findings demonstrate the dual role of climate in determining a fundamental ecosystem process, both directly via contemporary temperature and indirectly through the effects of previous temperature exposure on microbial activity. (C) 2017 Elsevier Ltd. All rights reserved.
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