气候变化领域集成服务门户(CCPortal): Interacting geomorphic and ecological response of step-pool streams after wildfire

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DOI	10.1130/B35049.1
	Interacting geomorphic and ecological response of step-pool streams after wildfire
	Chin A.; Solverson A.P.; O'Dowd A.P.; Florsheim J.L.; Kinoshita A.M.; Nourbakhshbeidokhti S.; Sellers S.M.; Tyner L.; Gidley R.
发表日期	2019
ISSN	167606
起始页码	1480
结束页码	1500
卷号	131 期号:2021-09-10
英文摘要	Detailed study of the response of step-pool mountain channels to wildfire is rare despite increasing vulnerability of these systems. This paper reports the initial biogeomorphic response of step-pool streams to storms following the 2012 Waldo Canyon Fire, Colorado, USA. Field surveys, benthic macroinvertebrate sampling, and light detection and ranging (LiDAR) terrestrial laser scanning through 2014 generated a substantial data set comparing changes within seven channels burned by a range of severity with three unburned reference reaches. Results showed that wildfire increased the susceptibility of step-pool channels to destabilize according to the severity of burn. Whereas the step-pool morphology (step height H, step length L, and H/L) remained relatively unchanged in unburned and low-severity burned channels- even through an extreme rainfall event with recurrence intervals up to 500-1000 years- study sites affected by high burn severity altered significantly following the first comparatively minor storms. Study channels burned by moderate severity exhibited variable responses ranging from minor to substantial morphological changes, suggesting that additional factors, including slope, local topography, and proximity to other highly disturbed sites may play explanatory roles. The ecological response corroborated the geomorphic findings, with data for benthic macroinver-tebrates varying according to burn severity along with the changing post-fire step-pool morphology. Ordination analysis enabled data synthesis and showed that precipitation intensity (r = 0.59) and the severity of burn (r = 0.60) together influenced the interacting morphologic and ecological responses after the Waldo Canyon Fire. Variations in H (r = 0.72), L (r = 0.56), and thalweg elevation (r = 0.75) correlated the most with the types of benthic macroinvertebrates present. Following the Waldo Canyon Fire, the highest rainfall intensities coincidentally occurred over study sites in high-severity burn areas. Although disentangling the effects of rainfall intensity and burn severity proved difficult given this scenario, the interacting and complementary roles of burn severity and rainfall intensity likely led to the greatest morphologic and ecological impacts at those sites. Findings offer insights for the post-fire management of steppool streams that characterize frequently burned mountain areas. As wildfires grow in frequency and magnitude under warming regimes, management becomes increasingly important for anticipating future changes in burned river landscapes, mitigating potential floods and hazards, and promoting sustainable river ecosystems. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184908
作者单位	Department of Geography and Environmental Sciences, University of Colorado Denver, P.O. Box 173364, Campus Box 172, Denver, CO 80217-3364, United States; Department of Environmental Science and Management, Humboldt State University, 1 Harpst Street, Arcata, CA 95521, United States; Earth Research Institute, University of California, Santa Barbara, 6832 Ellison Hall, Santa Barbara, CA 93106-3060, United States; Department of Civil, Construction and Environmental Engineering, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, United States
推荐引用方式 GB/T 7714	Chin A.,Solverson A.P.,O'Dowd A.P.,et al. Interacting geomorphic and ecological response of step-pool streams after wildfire[J],2019,131(2021-09-10).
APA	Chin A..,Solverson A.P..,O'Dowd A.P..,Florsheim J.L..,Kinoshita A.M..,...&Gidley R..(2019).Interacting geomorphic and ecological response of step-pool streams after wildfire.Bulletin of the Geological Society of America,131(2021-09-10).
MLA	Chin A.,et al."Interacting geomorphic and ecological response of step-pool streams after wildfire".Bulletin of the Geological Society of America 131.2021-09-10(2019).