Warming homogenizes apparent temperature sensitivity of ecosystem respiration.
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Where this comes from
- Record sourced from PubMed, PMID 33837072.
- Also identified by DOI 10.1126/sciadv.abc7358 and PMC identifier 8034862.
- Licence recorded as CC BY-NC.
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Abstract
Warming-induced carbon loss through terrestrial ecosystem respiration (<i>Re</i>) is likely getting stronger in high latitudes and cold regions because of the more rapid warming and higher temperature sensitivity of <i>Re</i> (<i>Q</i> <sub>10</sub>). However, it is not known whether the spatial relationship between <i>Q</i> <sub>10</sub> and temperature also holds temporally under a future warmer climate. Here, we analyzed apparent <i>Q</i> <sub>10</sub> values derived from multiyear observations at 74 FLUXNET sites spanning diverse climates and biomes. We found warming-induced decline in <i>Q</i> <sub>10</sub> is stronger at colder regions than other locations, which is consistent with a meta-analysis of 54 field warming experiments across the globe. We predict future warming will shrink the global variability of <i>Q</i> <sub>10</sub> values to an average of 1.44 across the globe under a high emission trajectory (RCP 8.5) by the end of the century. Therefore, warming-induced carbon loss may be less than previously assumed because of <i>Q</i> <sub>10</sub> homogenization in a warming world.