Forest ecosystems, disturbance, and climatic change in Washington State, USA |
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Authors: | Jeremy S Littell Elaine E Oneil Donald McKenzie Jeffrey A Hicke James A Lutz Robert A Norheim Marketa M Elsner |
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Institution: | 1. JISAO/CSES Climate Impacts Group, University of Washington, Box 355672, Seattle, WA, 98195-5672, USA 2. Rural Technology Initiative, School of Forest Resources, University of Washington, Box 352100, Seattle, WA, 98195-2100, USA 3. Pacific Wildland Fire Sciences Lab, US Forest Service, Suite 201, 400 N. 34th St., Seattle, WA, 98103, USA 4. Department of Geography, University of Idaho, P.O. Box 443021, Moscow, ID, 83844-3021, USA 5. School of Forest Resources, University of Washington, Box 352100, Seattle, WA, 98195-2100, USA 6. University of WA, Box 352700, Seattle, WA, 98195-2700, USA
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Abstract: | Climatic change is likely to affect Pacific Northwest (PNW) forests in several important ways. In this paper, we address the role of climate in four forest ecosystem processes and project the effects of future climatic change on these processes across Washington State. First, we relate Douglas-fir growth to climatic limitation and suggest that where Douglas-fir is currently water-limited, growth is likely to decline due to increased summer water deficit. Second, we use existing analyses of climatic controls on tree species biogeography to demonstrate that by the mid twenty-first century, climate will be less suitable for key species in some areas of Washington. Third, we examine the relationships between climate and the area burned by fire and project climatically driven regional and sub-regional increases in area burned. Fourth, we suggest that climatic change influences mountain pine beetle (MPB) outbreaks by increasing host-tree vulnerability and by shifting the region of climate suitability upward in elevation. The increased rates of disturbance by fire and mountain pine beetle are likely to be more significant agents of changes in forests in the twenty-first century than species turnover or declines in productivity, suggesting that understanding future disturbance regimes is critical for successful adaptation to climate change. |
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