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Warming-related increases in soil CO2 efflux are explained by increased below-ground carbon fluxAuthor(s): Christian P. Giardina; Creighton M. Litton; Susan E. Crow; Gregory P Asner
Source: Nature Climate Change 4, 822–827
Publication Series: Scientific Journal (JRNL)
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DescriptionThe universally observed exponential increase in soil-surface CO2 effux (‘soil respiration’; FS) with increasing temperature has led to speculation that global warming will accelerate soil organic carbon (SOC) decomposition, reduce SOC storage, and drive a positive feedback to future warming. However, interpreting temperature–FS relationships, and so modelling terrestrial carbon balance in a warmer world, is complicated by the many sources of respired carbon that contribute to FS and a poor understanding of how temperature influences SOC decomposition rates. Here we quantified FS, litterfall, bulk SOC and SOC fraction size and turnover, and total below-ground carbon flux (TBCF) across a highly constrained 5.2 degree C mean annual temperature (MAT) gradient in tropical montane wet forest. From these, we determined that: increases in TBCF and litterfall explain >90% of the increase in FS with MAT; bulk SOC and SOC fraction size and turnover rate do not vary with MAT; and increases in TBCF and litterfall do not influence SOC storage or turnover on century to millennial timescales. This gradient study shows that for tropical montane wet forest, long-term and whole-ecosystem warming accelerates below-ground carbon processes with no apparent impact on SOC storage.
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CitationGiardina, Christian P.; Litton, Creighton M.; Crow, Susan E.; Asner Gregory P. 2014. Warming-related increases in soil CO2 efflux are explained by increased below-ground carbon flux. Nature Climate Change 4, 822–827
Keywordssoil organic carbon, tropical forests, ecosystem carbon fluxes, climate change, warming
- Leaf litter decomposition rates increase with rising mean annual temperature in Hawaiian tropical montane wet forests
- Ecosystem carbon storage does not vary with increasing mean annual temperature in Hawaiian tropical montane wet forests
- The magnitude and variability of soil-surface CO2 efflux increase with temperature in Hawaiian tropical montane wet forests
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