Abstract:
:In the short-term heterotrophic soil respiration is strongly and positively related to temperature. In the long-term, its response to temperature is uncertain. One reason for this is because in field experiments increases in respiration due to warming are relatively short-lived. The explanations proposed for this ephemeral response include depletion of fast-cycling, soil carbon pools and thermal adaptation of microbial respiration. Using a > 15 year soil warming experiment in a mid-latitude forest, we show that the apparent 'acclimation' of soil respiration at the ecosystem scale results from combined effects of reductions in soil carbon pools and microbial biomass, and thermal adaptation of microbial respiration. Mass-specific respiration rates were lower when seasonal temperatures were higher, suggesting that rate reductions under experimental warming likely occurred through temperature-induced changes in the microbial community. Our results imply that stimulatory effects of global temperature rise on soil respiration rates may be lower than currently predicted.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
Bradford MA,Davies CA,Frey SD,Maddox TR,Melillo JM,Mohan JE,Reynolds JF,Treseder KK,Wallenstein MDdoi
10.1111/j.1461-0248.2008.01251.xsubject
Has Abstractpub_date
2008-12-01 00:00:00pages
1316-27issue
12eissn
1461-023Xissn
1461-0248pii
ELE1251journal_volume
11pub_type
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