期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 24, 页码 9135-9142出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL062024
关键词
albedo; fire; succession; snags; radiative forcing; disturbance
资金
- U.S. Department of Energy (DOE), Office of Science (BER) [DE-FG02-06ER64318]
- National Science Foundation [DEB-96-32921, DEB-0218088, DEB-0823380]
- Pacific Northwest Research Station of the U.S. Forest Service
- Oregon State University
- U.S. Forest Service
- National Park Service
- Division Of Environmental Biology
- Direct For Biological Sciences [1440409] Funding Source: National Science Foundation
This paper examines albedo perturbation and radiative forcing after a high-severity fire in a mature forest in the Oregon Cascade Range. Correlations between postfire albedo and seedling, sapling, and snag (standing dead tree) density were investigated across fire severity classes and seasons for years 4-15 after fire. Albedo perturbation was 14 times larger in winter compared to summer and increased with fire severity class for the first several years. Albedo perturbation increased linearly with time over the study period. Correlations between albedo perturbations and the vegetation densities were strongest with snags, and significant in all fire classes in both summer and winter (R<-0.92, p<0.01). The resulting annual radiative forcing at the top of the atmosphere became more negative linearly at a rate of -0.86Wm(-2)yr(-1), reaching -15Wm(-2) in year 15 after fire. This suggests that snags can be the dominant controller of postfire albedo on decadal time scales.
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