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

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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.
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
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132820
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]. Forest Ecology and Management,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.,466.
MLA	Rachels A.A.,et al."Quantifying effects of forest harvesting on sources of suspended sediment to an Oregon Coast Range headwater stream".466(2020).