Boreal forests store one-third of all terrestrial carbon—but for how long?
the effect of wildfires on the global carbon cycle. Sadly, we never got the chance to set those fires, because the firefighters enlisted to help us were busy dealing with an area the size of Belgium that was already burning.
According to a new study examining the impacts of Canada's 2014 wildfires, that stored carbon is under threat. Wildfires are becoming sothat they are already turning some boreal forest areas from carbon sinks into net emitters. As part of the natural carbon cycle, the lost carbon is stored again by new trees that use CO2 from the air to grow, as well as by the dead plants, leaves and branches that accumulate in the soil. It can take many decades until all the carbon that was emitted during a fire is recaptured by the ecosystem but—as long as the time between two fires is longer than the time required to recapture that lost carbon—boreal forests remain a carbon sink.
We're currently studying boreal forests in little-researched north-eastern China, where worried forest managers are reporting decreased snow cover and burning of an intensity and extent they have not experienced before.
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