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Thermal adaptation of soil microbial respiration to elevated temperature
Author(s) -
Bradford Mark A.,
Davies Christian A.,
Frey Serita D.,
Maddox Thomas R.,
Melillo Jerry M.,
Mohan Jacqueline E.,
Reynolds James F.,
Treseder Kathleen K.,
Wallenstein Matthew D.
Publication year - 2008
Publication title -
ecology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.852
H-Index - 265
eISSN - 1461-0248
pISSN - 1461-023X
DOI - 10.1111/j.1461-0248.2008.01251.x
Subject(s) - respiration , soil respiration , environmental science , biomass (ecology) , acclimatization , ecology , carbon cycle , ecosystem , microbial population biology , soil carbon , global warming , climate change , cycling , biology , soil water , soil science , botany , history , genetics , archaeology , bacteria
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.