气候变化领域集成服务门户(CCPortal): Post-wildfire riparian forest recovery processes along a regulated river corridor

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DOI	10.1016/j.foreco.2020.118513
	Post-wildfire riparian forest recovery processes along a regulated river corridor
	Tranmer A.W.; Benjankar R.; Tonina D.
发表日期	2020
ISSN	0378-1127
卷号	478
英文摘要	Riparian forest recovery was monitored over a 23 km study site that encountered a mixed low to moderate severity wildfire on the floodplain that was followed by a sequence of flows ranging from below bankfull to a 50-year flood on the regulated South Fork Boise River, Idaho, USA. The goals of the study were to examine the dominant mechanisms of post-wildfire riparian forest regeneration along the river corridor in relation to upstream dam operations. Results are put in context with trends occurring in the regulated river system over the past 70 years that exemplify post-impoundment floodplain dynamics. Aerial imagery and field surveys were used to examine trends in geomorphic and forest response related to flow regulation, riparian wildfire, and a 50-year flood. Additionally, a one-dimensional sediment transport model was employed to assess seedling recruitment related to local and reach-scale erosional and depositional processes over a five-year period following the wildfire. A conceptual model is presented to illustrate riparian forest response to the interacting influences of fire severity and flood disturbance to help guide post-wildfire riparian forest management activities. Aerial imagery between 1957 and 2011 shows that flow regulation after dam closure led to channel narrowing of 62% of historic active channel width and an associated increase in floodplain tree density of 59%. This expansion of forest cover on the floodplain was at the expense of seedling recruitment habitat for pioneer species in the Salicaceae family that require bare sediment, light exposure, and access to the shallow groundwater. A 2013 riparian wildfire led to substantial top kill on the floodplain that provided a disturbance for potential seedling recruitment. However, dam releases during average and wet hydrologic conditions led to only 5% of the total observed seedling recruitment in the system occurring on the floodplain due to the limited magnitude of flood disturbances following the burn, highlighting the importance of the sequence of environmental flows immediately following riparian wildfire. Alternatively, 95% of seedling recruitment occurred within the active channel and was directly related to sediment transport processes. Post-wildfire related debris flows were responsible for providing the requisite sediment supply to the channel in an otherwise sediment supply-limited, regulated river system. Resultant sediment deposition was responsible for providing 100% of seedling recruitment habitat in the active channel during dam releases in average hydrologic conditions, whereas deposition accounted for 84% and erosion accounted for 16% of observed recruitment habitat during wet hydrologic conditions. © 2020 Elsevier B.V.
英文关键词	Floodplains; Riparian forest; Riparian wildfire; Sediment supply; Seedling recruitment
语种	英语
scopus关键词	Aerial photography; Antennas; Banks (bodies of water); Dams; Ecosystems; Erosion; Fires; Floods; Groundwater; Hydroelectric power plants; Reforestation; Sediment transport; Sedimentation; Depositional process; Hydrologic conditions; Riparian forest management; Sediment deposition; Sediment transport model; Sediment transport process; Seedling recruitment; Shallow groundwater; Rivers; floodplain forest; flow regulation; forest cover; forest management; pioneer species; population density; regeneration; riparian forest; river system; sediment transport; seedling establishment; wildfire; Air Craft; Dams; Ecosystems; Erosion; Fires; Floods; Boise River; Idaho; United States; Salicaceae
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154954
作者单位	Center for Ecohydraulics Research, University of Idaho, 322 E. Front St., Boise, ID 83702, United States; Department of Civil Engineering, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
推荐引用方式 GB/T 7714	Tranmer A.W.,Benjankar R.,Tonina D.. Post-wildfire riparian forest recovery processes along a regulated river corridor[J],2020,478.
APA	Tranmer A.W.,Benjankar R.,&Tonina D..(2020).Post-wildfire riparian forest recovery processes along a regulated river corridor.Forest Ecology and Management,478.
MLA	Tranmer A.W.,et al."Post-wildfire riparian forest recovery processes along a regulated river corridor".Forest Ecology and Management 478(2020).