期刊
SCIENCE
卷 329, 期 5993, 页码 838-840出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1189587
关键词
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资金
- CarboEuropeIP
- FAO-GTOS-TCO
- Integrated Land Ecosystem-Atmosphere Processes Study (iLEAPS)
- Max Planck Institute for Biogeochemistry
- NSF
- University of Tuscia
- U.S. Department of Energy
- U.S. Department of Energy, Biological and Environmental Research [DE-FG02-04ER63917]
- European Research Council
- European Commission [FP7-ENV2008-1-226701]
- Max Planck Society
The respiratory release of carbon dioxide (CO2) from the land surface is a major flux in the global carbon cycle, antipodal to photosynthetic CO2 uptake. Understanding the sensitivity of respiratory processes to temperature is central for quantifying the climate-carbon cycle feedback. We approximated the sensitivity of terrestrial ecosystem respiration to air temperature (Q(10)) across 60 FLUXNET sites with the use of a methodology that circumvents confounding effects. Contrary to previous findings, our results suggest that Q(10) is independent of mean annual temperature, does not differ among biomes, and is confined to values around 1.4 +/- 0.1. The strong relation between photosynthesis and respiration, by contrast, is highly variable among sites. The results may partly explain a less pronounced climate-carbon cycle feedback than suggested by current carbon cycle climate models.
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