Publication Date:
2010-07-07
Description:
The respiratory release of carbon dioxide (CO(2)) from the land surface is a major flux in the global carbon cycle, antipodal to photosynthetic CO(2) 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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mahecha, Miguel D -- Reichstein, Markus -- Carvalhais, Nuno -- Lasslop, Gitta -- Lange, Holger -- Seneviratne, Sonia I -- Vargas, Rodrigo -- Ammann, Christof -- Arain, M Altaf -- Cescatti, Alessandro -- Janssens, Ivan A -- Migliavacca, Mirco -- Montagnani, Leonardo -- Richardson, Andrew D -- New York, N.Y. -- Science. 2010 Aug 13;329(5993):838-40. doi: 10.1126/science.1189587. Epub 2010 Jul 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max Planck Institute for Biogeochemistry, 07745 Jena, Germany. mmahecha@bgc-jena.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20603495" target="_blank"〉PubMed〈/a〉
Keywords:
Carbon/metabolism
;
Carbon Dioxide/*metabolism
;
Cell Respiration
;
*Climate
;
Ecological and Environmental Processes
;
*Ecosystem
;
Models, Biological
;
Models, Statistical
;
Photosynthesis
;
Plants/*metabolism
;
Soil/analysis
;
Soil Microbiology
;
*Temperature
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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