20170406

Author :  
Caitlin E. Hicks Pries, C. Castanha, R. C. Porras, M. S. Torn
Year : 
2017
Title : 
The whole-soil carbon flux in response to warming
Journal : 
Science
Comment 
Empirical determination of the temperature response from whole-soil profiles (0 to >100 cm) has been difficult. The majority of in situ warming experiments focus on warming the top 5 to 20 cm of
surface soil; thus, they may miss the response of subsoils (below 20 cm), which contain >50% of global SOC stocks. In a deep warming experiment in mineral soil, they found that soil respiration from all soil depths increased with 4°C warming; annual soil respiration increased by 34 to 37%. All depths responded to warming with similar temperature sensitivities, driven by decomposition of decadal-aged carbon. Whole-soil warming reveals a larger soil respiration response than many in situ experiments (most of which only warm the surface soil) and models.

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