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Nitrogen deposition is altering forest dynamics, terrestrial carbon storage, and biodiversity. However, our ability to forecast how different tree species will respond to N deposition, especially key response thresholds, is limited by a lack of synthesis across spatial scales and research approaches. To develop our best understanding of N deposition impact on tree growth and survival, we will integrate plot-­‐ level studies describing plant growth and survival responses to N inputs and plant-­‐ available soil nutrients with a continental scale analysis across a N deposition gradient. Our primary outcome will be estimates of tree response to N deposition with explicit representation of uncertainty and the identification...
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Biological nitrogen fixation (BNF) is a critical biogeochemical process that converts inert atmospheric N2 gas into biologically usable forms of the essential nutrient nitrogen. A variety of free-living and symbiotic organisms carry out BNF, and in most regions worldwide, BNF is the largest source of nitrogen that fuels terrestrial ecosystems. As a result, BNF has far reaching effects on ecosystem properties (water quality, carbon storage), sustainability (plant growth, soil fertility), and the global climate system. Despite this cross-cutting importance, existing syntheses of BNF have major gaps, with particular challenges in upscaling local measurements across large areas. These gaps, and a corresponding lack...
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Climatic warming has contributed to recent increases in severe wildfires across the Pacific Northwest (PNW). Following severe wildfire, a burned forest has an increased likelihood burning again within several decades, which can greatly alter vegetation recovery. These changes are of increasing concern to forest managers, conservationists, researchers, the public, and culture bearers. However, more information is needed to gauge how PNW forests respond to severe wildfire reburns under ongoing climate change. In this project, researchers and natural resource managers will jointly develop new applied science to anticipate and gauge the resilience of forests in the western Cascades of the PNW to climate change impacts....
    map background search result map search result map Post-fire Vegetation Transitions in Burned and Reburned Forests in the Western Cascades Post-fire Vegetation Transitions in Burned and Reburned Forests in the Western Cascades