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Decadal-scale recovery of carbon stocks after wildfires throughout the boreal forests

Journal Article · · Global Biogeochemical Cycles
DOI:https://doi.org/10.1029/2020GB006612· OSTI ID:1668812
Boreal forests store 30% of the world's terrestrial carbon (C). Consequently, climate change mediated alterations in the boreal forest fire regime can have a significant impact on the global C budget. Here, we synthesize the effects of forest fires on the stocks and recovery rates of C in boreal forests from 368 plots from 16 long-term (= 100 years) fire chronosequences spread throughout the boreal zone. The mean annual temperature varied from -9.5°C to +5.2°C and annual precipitation from 295 mm to 824 mm in the study sites. Total C stocks decreased on average by 60% (range from <10% to >80%) because of forest fires, primarily due to large declines in the living trees and O-layer C stocks. C emissions of fires ranged from 0.1 to 11.4 kg m-2, and in most cases, the emissions were < 4 kg m-2. Total C stocks increased with time since fire following a sigmoidal shape Gompertz function, and it took 125 years until an average asymptote of 8.1 kg C m-2 was reached. Total C stocks accumulated at a rate of 2–60 g m-2 yr-1 during the first 100 years. We found that potential evapotranspiration (PET) was significantly correlated with C stocks and their post-fire recovery, likely because it integrates temperature, radiation and the length of the growing season. If the fire return interval shortens to under 100 years in the future, this suggests that many boreal forests will be prevented from reaching their full C storage potential. However, our results suggest that climate warming-induced increases in PET may also speed up the post-fire recovery of C stocks.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1668812
Report Number(s):
PNNL-SA-150982
Journal Information:
Global Biogeochemical Cycles, Journal Name: Global Biogeochemical Cycles Journal Issue: 8 Vol. 34
Country of Publication:
United States
Language:
English

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