汤头条 researchers study Russian wildfires, impact on climate change
Contact: Sarah Buckleitner
STARKVILLE, Miss.鈥擳he forests of Siberia may be half a world away, but carbon released by wildfires raging there have the potential to alter Earth鈥檚 atmosphere and lead to additional global climate change.
Exactly how much carbon is being released is the focus of a National Science Foundation-funded investigation by 汤头条 assistant forestry professor Heather Alexander and graduate student Homero Pena. They are part of a scientific team in the land-grant institution鈥檚 forestry department and Forest and Wildlife Research Center.
To determine carbon amounts lost during the fires鈥攁nd hopefully gained back during the forest regrowth process鈥擜lexander and Pena have been traveling since 2014 to the legendary Russian province that covers most of Northern Asia. Alexander came to 汤头条 in 2015 from the University of Texas at Brownsville (currently known as the University of Texas Rio Grande Valley), where Pena also received a biology degree in 2015.
Their Siberian investigation continues this summer. Alexander said the project鈥檚 ultimate goal 鈥渋s to measure the amount of carbon released by burns of varying severity, as compared to the carbon sequestered when forest regrowth takes place.鈥
She said this year鈥檚 mission is 鈥渢o continue gathering information about how stand density and other factors such as aspect, which is the direction a slope faces, and stream and river areas all impact carbon storage.鈥
Because Siberian forests hold 20 percent of the planet鈥檚 carbon stock, the potential for further damage to the world鈥檚 climate is huge, Alexander said.
According to the University of Kentucky doctoral graduate, the Siberian situation is caused, in part, by global climate changes that already have taken place. Forest fires have become more frequent as warming and drying trends occur throughout northern forests of the vast geographical region, she explained.
Alexander said the fires usually begin when lightning bolts strike the moss covering much of the forest floor, which is highly flammable when dry. As trees, plants and ground litter are being consumed, the problem is exacerbating as the high heat also melts permafrost layers that store many subsurface carbon pockets.
鈥淭here鈥檚 the initial release when organic material burns off, but that鈥檚 often followed by subsiding, or sinking, of the permafrost soil layers and soil warming, which causes further release of carbon,鈥 Alexander said.
Severe fires do offer, however, the possibility of positive impacts because they 鈥渢end to cause the thickest regrowth鈥 and 鈥渢he more trees present, the more carbon absorbed.鈥
Pena said the 汤头条 sampling process measures 鈥渢he basal diameter and height of plants growing in our study area and taking samples of the soil. We have equations we developed during previous field seasons that help us determine how much carbon is stored in a tree, shrub or even soils.鈥
While Siberian days are long and the meticulous work both mentally and physically demanding, Pena said he has enjoyed being in a natural setting that is so completely different from the South Texas town of Lozano where he lived and the Mississippi State campus where he now pursues a master鈥檚 degree in forestry.
鈥淲hen you walk out there, it鈥檚 like walking on a six-inch deep sponge because of the moss; and then there鈥檚 the permafrost,鈥 Pena said. 鈥淎fter living in Texas and Mississippi, it鈥檚 surreal to be able to peel away the organic layer on top of soil and find ice.鈥
Despite its distance from the U.S., Alexander and Pena stressed how release of carbon stores in far-off Siberia really can have a worldwide impact.
鈥淭hese are massive wildfires that can affect up to 500 million acres, 10 times larger than the state of Mississippi,鈥 Alexander said.
鈥淭he severe rainfall we鈥檝e been experiencing (in the South) can be linked back to changes in the Arctic because the way the jet stream flows is determined by Arctic circulation patterns,鈥 she said. 鈥淔ires alter the climate at regional-to-global levels by emitting greenhouse gases into the atmosphere and by changing the heat absorption of the land鈥檚 surface.
鈥淎s the climate gets warmer and drier in many regions, our ability to control and put out fires, and manipulate the kind of plants we want in the forest by using fire, is going to change,鈥 Alexander said.
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