Thermal adaptation of soil microbial respiration to elevated temperature
Thermal adaptation of soil microbial respiration to elevated temperature
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DOI：
10.1111/j.1461-0248.2008.01251.x
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发表时间：
2008-12-01
期刊：
影响因子：
8.8
通讯作者：
Wallenstein, Matthew D.
中科院分区：
文献类型：
--
作者：
Bradford, Mark A.;Davies, Christian A.;Wallenstein, Matthew D.
短期内异养土壤呼吸与温度呈显著正相关。从长期来看，它对温度的反应是不确定的。其中一个原因是，在野外实验中，由于变暖导致的呼吸作用的增加是相对短暂的。对这种短暂反应的解释包括快速循环枯竭、土壤碳库和微生物呼吸的热适应。研究结果表明，土壤呼吸在生态系统尺度上的明显“驯化”是土壤碳库和微生物量减少以及微生物呼吸的热适应共同作用的结果。当季节温度较高时，质量比呼吸速率较低，这表明实验变暖下的速率降低可能是通过温度引起的微生物群落变化发生的。我们的结果表明，全球气温上升对土壤呼吸速率的刺激作用可能比目前预测的要低。
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.