Boreal forests store substantial amounts of carbon in vegetation and soil pools. The magnitude of these pools is related to fire regime attributes. Climate change is expected to alter boreal fire regimes, leading to changes in the amount of stored carbon. Quantifying these changes is of importance to understanding and managing global carbon budgets. We investigate how fire return interval (FRI) interacts with seasonal variation in fire intensity and severity to affect carbon stocks and fluxes in the boreal black spruce forests of Québec, Canada. A size-class structured population model of stand dynamics was coupled with an established model of boreal carbon dynamics and linked to a simplified representation of fire regime that simulates the occurrence of fires and their direct effects on canopy tree mortality, surface fuels combustion and regeneration. We simulated carbon stocks and fluxes under seven levels of FRI and two fire seasons: spring and summer. We tested for an effect of these fire regime parameters on equilibrium mean C stocks. All dead organic matter and biomass carbon stocks were sensitive to FRI between 60 and 300 years. These C stocks were lower for summer fires that occurred under shorter FRIs. Net primary production was highest at FRIs between 150 and 300 years. Total C stocks were highest for FRIs from 150 to 700 years, varying little over this range. There was a small but significant difference of C pool sizes between stands with even and uneven tree-diameter distributions. This difference was greatest for FRIs of 150 years or less. Reductions in equilibrium C storage are forecasted for nearly 27% of the study region under expected end-of-century climates.
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This research was funded by an Natural Sciences and Engineering Research Council of Canada (NSERC) (Grant No. 365322-2008), Strategic grant to A.D. Munson, R.L. Bradley, S.G. Cumming, S. Gauthier, D. Paré and S. Quideau, and a NSERC- CGS D-Alexander Graham Bell Graduate scholarship to Y. Miquelajauregui. We thank the Centre d’étude de la forêt for financial and logistic support. Very special thanks to M. Fortin and J. Marchal for their assistance during the model implementation. We thank the Ministère des Forêts, de la Faune et des Parcs (MFFP) and the Societé de protection des forêts contre le feu (SOPFEU) for allowing us to use the inventory and forest fire archives. We thank P. Bernier and C. Boisvenue for the invaluable comments provided to earlier versions of this manuscript. We thank R. García for his help preparing the code for publication.
YM, SGC and SG conceived of or designed study; YM performed research; YM analyzed data; YM, SGC and SG contributed new methods or models; YM, SGC, SG wrote the paper.
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Miquelajauregui, Y., Cumming, S.G. & Gauthier, S. Sensitivity of Boreal Carbon Stocks to Fire Return Interval, Fire Severity and Fire Season: A Simulation Study of Black Spruce Forests. Ecosystems 22, 544–562 (2019). https://doi.org/10.1007/s10021-018-0287-4
- boreal forest
- size-class structured population models
- stand dynamics
- carbon stocks
- fire regime