According to blogger Lorene Lynn, “Fire season began in April 2019, a full two months earlier than in the past. Fires burned 2.6 million acres in 2019, of which approximately 1.6 million were in interior Alaska where permafrost is prevalent.”
Due to growing concern over the release of carbon from thawing permafrost, one might ask how fire affects permafrost. It is a complex topic, and one that is not fully understood.
Many fires will burn the surface plants, but not penetrate through the deep moss, protecting the soil. Sometimes though, moss is lost and there is less insulation at the soil surface. It exposes the soil to greater thaw in the summer and a colder freeze in the winter.
“Shifts in vegetation community are common following fire,” says Lynn. “Over time, spruce will again move in and the permafrost returns to its previous temperatures.”
As our climate warms, some are concerned that large burned areas may not refreeze. This could lead to massive thawing and slumping of the permafrost, called thermokarst. This is already happening in the arctic, even where fire has not existed.
“In southcentral Alaska, I am working on a 35-acre restoration project,” explains Lynn. “Our work plan at the restoration site is shifting toward cultivation of plants from seed and cuttings to supplement the loss of native vegetation.”
“The forests will grow again. We just need to hope the permafrost will stay frozen,” says Lynn.
To learn more about what happened to Alaska’s soils during the 2019 fires, read the entire blog post: https://soilsmatter.wordpress.com/2020/03/01/what-happened-to-alaskas-soils-during-the-2019-fires
Follow SSSA on Facebook at SSSA.soils, and Twitter at SSSA_Soils. SSSA has soils information on www.soils.org/about-soils, for teachers at www.soils4teachers.org, and for students through 12th grade, www.soils4kids.org.
The Soil Science Society of America is an international scientific and professional society with its headquarters in Madison, WI. Our members are dedicated to advancing the field of soil science in relation to food production, environmental quality, sustainability, waste management and wise land use. We work at universities, government research facilities and private businesses across the United States and the world.
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