| DOI: | 10.1002/grl.50277
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| 论文题名: | Vegetation and wildfire controls on sediment yield in bedrock landscapes |
| 作者: | Dibiase R.A.; Lamb M.P.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9241
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| EISSN: | 1944-8972
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| 出版年: | 2013
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| 卷: | 40, 期:6 | | 起始页码: | 1093
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| 结束页码: | 1097
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| 语种: | 英语
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| 英文关键词: | bedrock hillslope
; dry ravel
; wildfire
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| Scopus关键词: | dry ravel
; Hillslopes
; Inverse dependence
; Landscape evolutions
; Sediment production
; Sediment stability
; Southern California
; wildfire
; Catchments
; Climate change
; Dams
; Fires
; Geologic models
; Sedimentology
; Tectonics
; Vegetation
; Sediments
; bedrock
; catchment
; climate change
; dam
; erosion
; geometry
; hillslope
; landscape
; landscape evolution
; sediment analysis
; sediment transport
; tectonic structure
; vegetation structure
; wildfire
; California
; United States
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| 英文摘要: | Steep, rocky landscapes commonly exhibit high sediment yields and are especially sensitive to climate, tectonics, and wildfire. Predicting landscape response to these perturbations demands a quantitative understanding of erosion processes. However, existing models for hillslope sediment production and transport do not apply to landscapes with patchy soil and slopes that exceed the angle for sediment stability. Here we present field measurements in southern California, USA, which indicate that sediment storage on steep slopes is enabled by vegetation that traps sediment upslope. We find that the storage capacity of unburned vegetation dams follows a geometric scaling model with a cubic dependence on effective plant width and an inverse dependence on local slope. Measured sediment volumes behind burned vegetation dams indicate a loss of at least 75% relative to unburned dams, and when expanded to the catchment scale, our measurements match records of postfire sediment yield from nearby retention basins. Contrary to existing models, our observations indicate that wildfire-induced sediment yield is driven by transient storage and release of sediment by vegetation dams, rather than increased bedrock-to-soil conversion rates. Without a feedback between soil production and wildfire, fire may play little role in long-term landscape evolution, and increasing fire frequency in response to climate change may not result in heightened sedimentation hazards due to supply limitations. Key Points Vegetation dams control sediment storage on bedrock hillslopes Post-fire sediment yield increases due to burning of vegetation dams Sedimentation response to fire may be supply limited on steep bedrock slopes. ©2013 American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876890569&doi=10.1002%2fgrl.50277&partnerID=40&md5=dd082bd44d06e4d93ce2f3e7b8303d0d
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6505
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, United States
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| Recommended Citation: | |
Dibiase R.A.,Lamb M.P.. Vegetation and wildfire controls on sediment yield in bedrock landscapes[J]. Geophysical Research Letters,2013-01-01,40(6).
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