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Climate change has increased the area affected by forest fires each year in boreal North America. Increases in burned area and fire frequency are expected to stimulate boreal carbon losses. However, the impact of wildfires on carbon emissions is also affected by the severity of burning. How climate change influences the severity of biomass burning has proved difficult to assess. Here, we examined the depth of ground-layer combustion in 178 sites dominated by black spruce in Alaska, using data collected from 31 fire events between 1983 and 2005. We show that the depth of burning increased as the fire season progressed when the annual area burned was small. However, deep burning occurred throughout the fire season...
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The likely direction of change in soil organic carbon (SOC) in the boreal forest biome, which harbors roughly 22% of the global soil carbon pool, is of marked concern because climate warming is projected to be greatest in high latitudes and temperature is the cardinal determinant of soil C mineralization. Moreover, the majority of boreal forest SOC is harbored in surficial organic horizons which are the most susceptible to consumption in wildfire. This research focuses on mechanisms of soil C accumulation in recently burned (2004) and unburned (61850-1950) black spruce (Picea mariana [Mill.] BSP) forests along gradients in stand productivity and soil temperature. The primary research questions in these three chapters...
    map background search result map search result map Controls on ecosystem and root respiration across a permafrost and wetland gradient in interior Alaska Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska Seasonal ice and hydrologic controls on dissolved organic carbon and nitrogen concentrations in a boreal-rich fen Evaluation of the composite burn index for assessing fire severity in Alaskan black spruce forests The response of soil organic carbon of a rich fen peatland in interior Alaska to projected climate change Mechanisms of soil carbon stabilization in black spruce forests of interior Alaska: Soil temperature, soil water, and wildfire Recovery of Carbon Pools a Decade Following Wildfire in Black Spruce Forests of Interior Alaska: Effects of Soil Texture and Landscape Position Controls on ecosystem and root respiration across a permafrost and wetland gradient in interior Alaska Seasonal ice and hydrologic controls on dissolved organic carbon and nitrogen concentrations in a boreal-rich fen The response of soil organic carbon of a rich fen peatland in interior Alaska to projected climate change Recovery of Carbon Pools a Decade Following Wildfire in Black Spruce Forests of Interior Alaska: Effects of Soil Texture and Landscape Position Evaluation of the composite burn index for assessing fire severity in Alaskan black spruce forests Mechanisms of soil carbon stabilization in black spruce forests of interior Alaska: Soil temperature, soil water, and wildfire Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska