气候变化领域集成服务门户(CCPortal): Quantifying effects of forest harvesting on sources of suspended sediment to an Oregon Coast Range headwater stream

CCPortal

DOI	10.1016/j.foreco.2020.118123
	Quantifying effects of forest harvesting on sources of suspended sediment to an Oregon Coast Range headwater stream
	Rachels A.A.; Bladon K.D.; Bywater-Reyes S.; Hatten J.A.
发表日期	2020
ISSN	0378-1127
卷号	466
英文摘要	Elevated fine sediment transport to streams can negatively affect aquatic ecosystem health, downstream infrastructure, and community water supply. Forest harvesting activities can increase the delivery of fine sediment to streams due to intensified erosion or mass wasting from hillslopes, roads, and stream channels. However, quantifying the effects of forest harvesting on sediment inputs to streams and the effectiveness of current best management practices (BMPs) at mitigating these effects remains a challenge. In this study, we used sediment source fingerprinting techniques to quantify and compare the sources of suspended sediment to a stream draining a recently harvested catchment and a nearby, unharvested reference catchment in the Oregon Coast Range of the U.S. Pacific Northwest. In each stream, we quantified the proportional contributions of suspended sediment from three potential source areas: hillslopes, roads, and streambanks. The primary source of suspended sediment in the harvested catchment was streambank sediment (90.2 ± 3.4%) with lesser amounts of hillslope (7.1 ± 3.1%) and road (3.6 ± 3.6%) sediment. Interestingly, the proportional contributions of suspended sediment in the reference catchment were similar, with the majority from streambanks (93.1 ± 1.8%) followed by hillslopes (6.9 ± 1.8%). There were no contributions from roads in the reference catchment, despite a similar road network as the harvested catchment. We also quantified monthly sediment mass eroded from 36 × 1 m2 hillslope plots. The sediment mass eroded from the general harvest area (96.5 ± 57.0 (SE) g) was ~10.6-times greater than the sediment collected in the riparian buffer (9.1 ± 1.9 g) and ~4.6-times greater than the sediment collected on the unharvested, reference hillslope (21.0 ± 3.3 g). While this study provides evidence of effectiveness of contemporary BMPs (e.g., riparian management areas, limits to cutblock size, reduced impact forest harvesting techniques, road building and maintenance) at mitigating sediment delivery to streams, additional research is needed as existing studies do not adequately reflect the broad range of climate, geology, topography, and vegetation in the Pacific Northwest, which drive highly variable hydrologic and geomorphic processes in the region. © 2020 Elsevier B.V.
英文关键词	Best Management Practices (BMPs); Forest management; Headwater streams; Pacific Northwest; Riparian management areas; Sediment fingerprinting
语种	英语
scopus关键词	Aquatic ecosystems; Aquatic organisms; Banks (bodies of water); Catchments; Erosion; Forestry; Harvesting; Highway administration; Rivers; Roads and streets; Runoff; Sediment transport; Topography; Water supply; Best management practice (BMPs); Headwater stream; Pacific Northwest; Riparian management; Sediment fingerprinting; Suspended sediments; best management practice; catchment; forest management; headwater; hillslope; mountain stream; quantitative analysis; riparian vegetation; suspended sediment; timber harvesting; Erosion; Forestry; Harvesting; Rivers; Runoff; Sediments; Suspended Solids; Topography; Oregon; Pacific Northwest; United States
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/155283
作者单位	Department of Forest Engineering, Resources, and Management, Oregon State University, Corvallis, OR 97331, United States; Department of Earth and Atmospheric Sciences, University of Northern Colorado, Greeley, CO 80639, United States
推荐引用方式 GB/T 7714	Rachels A.A.,Bladon K.D.,Bywater-Reyes S.,et al. Quantifying effects of forest harvesting on sources of suspended sediment to an Oregon Coast Range headwater stream[J],2020,466.
APA	Rachels A.A.,Bladon K.D.,Bywater-Reyes S.,&Hatten J.A..(2020).Quantifying effects of forest harvesting on sources of suspended sediment to an Oregon Coast Range headwater stream.Forest Ecology and Management,466.
MLA	Rachels A.A.,et al."Quantifying effects of forest harvesting on sources of suspended sediment to an Oregon Coast Range headwater stream".Forest Ecology and Management 466(2020).