期刊
NEW PHYTOLOGIST
卷 196, 期 1, 页码 79-91出版社
WILEY
DOI: 10.1111/j.1469-8137.2012.04225.x
关键词
biogeochemical model; carbon-use efficiency (CUE); microbial stoichiometry; nutrient limitation; soil moisture; temperature
资金
- US Department of Energy (DOE) through Office of Biological and Environmental Research (BER) Terrestrial Carbon Processes (TCP) program [DE-SC0006967]
- US Department of Agriculture [2011-67003-30222]
- US National Science Foundation [CBET-1033467, DEB-1145875/1145649]
- Austrian Science Fund [FWF - CLIMEX P22214]
- Division Of Environmental Biology
- Direct For Biological Sciences [1145649] Funding Source: National Science Foundation
- Austrian Science Fund (FWF) [P22214] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 22214] Funding Source: researchfish
Carbon (C) metabolism is at the core of ecosystem function. Decomposers play a critical role in this metabolism as they drive soil C cycle by mineralizing organic matter to CO2. Their growth depends on the carbon-use efficiency (CUE), defined as the ratio of growth over C uptake. By definition, high CUE promotes growth and possibly C stabilization in soils, while low CUE favors respiration. Despite the importance of this variable, flexibility in CUE for terrestrial decomposers is still poorly characterized and is not represented in most biogeochemical models. Here, we synthesize the theoretical and empirical basis of changes in CUE across aquatic and terrestrial ecosystems, highlighting common patterns and hypothesizing changes in CUE under future climates. Both theoretical considerations and empirical evidence from aquatic organisms indicate that CUE decreases as temperature increases and nutrient availability decreases. More limited evidence shows a similar sensitivity of CUE to temperature and nutrient availability in terrestrial decomposers. Increasing CUE with improved nutrient availability might explain observed declines in respiration from fertilized stands, while decreased CUE with increasing temperature and plant C : N ratios might decrease soil C storage. Current biogeochemical models could be improved by accounting for these CUE responses along environmental and stoichiometric gradients.
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