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Sammanfattning

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 using 368 plots from 16 long-term (>= 100 year) fire chronosequences distributed throughout the boreal zone. Forest fires led to a decrease in total C stocks (excluding mineral soil) by an average of 60% (range from 80%), which was primarily a result of C stock declines in the living trees and soil organic layer. Total C stocks increased with time since fire largely following a sigmoidal shape Gompertz function, with an average asymptote of 8.1 kg C m(-2). Total C stocks accumulated at a rate of 2-60 g m(-2) yr(-1)during the first 100 years. Potential evapotranspiration (PET) was identified as a significant driver of 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

Nyckelord

Carbon accumulation; Carbon pools; Chronosequence; Fire; Post-fire succession

Publicerad i

Global Biogeochemical Cycles
2020, volym: 34, nummer: 8, artikelnummer: e2020GB006612
Utgivare: AMER GEOPHYSICAL UNION

SLU författare

UKÄ forskningsämne

Geokemi
Skogsvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1029/2020GB006612

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/107911