气候变化领域集成服务门户(CCPortal): Quantifying regional trends in large live tree and snag availability in support of forest management

CCPortal

DOI	10.1016/j.foreco.2020.118554
	Quantifying regional trends in large live tree and snag availability in support of forest management
	Bell D.M.; Acker S.A.; Gregory M.J.; Davis R.J.; Garcia B.A.
发表日期	2021
ISSN	0378-1127
卷号	479
英文摘要	In the Pacific Northwest of the United States, 20th century timber harvesting resulted in major declines in area of forests supporting large live and dead trees (i.e., snags), that are not only key habitat elements for many wildlife species but also critical components of ecosystem function. Regional forest management guidance, such as the Northwest Forest Plan (1994) and Eastside Screens (1995), may aim to conserve and foster the development of late-successional old-growth forests, characterized by large live and dead trees. Satellite remote sensing supports regional monitoring efforts of these habitat characteristics, but managers may require additional guidance in order to leverage these data for large landscape or regional assessments. In this study, our objectives were to assess long-term (historical vs. contemporary) and short-term (1993–2017) changes in lands supporting large live trees and snags across 10 wildlife habitat types (WHTs) – disparate vegetation conditions that support significantly different wildlife communities – in Oregon and Washington, USA. We generated 30-m, annual maps of large live trees (>50 cm, >75 cm, and >100 cm diameter) and snags (>25 cm and > 50 cm diameter) based on the gradient nearest neighbor (GNN) imputation method. GNN integrates Landsat satellite imagery, geospatial climatic and topographic data, and USDA Forest Service Forest Inventory and Analysis data to predict forest attributes for all forested lands in the study area. GNN classification accuracy was poor to good for large live trees (Cohen's kappa = 0.2 – 0.6) and poor to fair for snags (Cohen's kappa = 0.1 – 0.3) in most WHTs, though performance was substantially lower in drier WHTs where large live trees and snags were rare. Our results highlighted long-term reductions in forest supporting large live trees and snags from historical to contemporary times, especially in wetter, more productive WHTs. In contrast, we observed short-term (1993–2017) increases in areas supporting large live trees and snags. Federal forests were both more similar to reference conditions and exhibited greater recent increases in areas supporting large live trees compared to nonfederal lands. Thus, Oregon and Washington have lost a substantial proportion of forests containing large live trees and snags and recent recruitment of these trees at regional scales is a slow process primarily occurring on federal lands. However, detecting such changes through current Landsat satellite mapping technologies remains challenging, highlighting the need for new mapping methods to aid in future management. © 2020
英文关键词	Forest change; Landsat imagery; Snags; Trees; Vegetation mapping; Wildlife habitat
语种	英语
scopus关键词	Animals; Ecosystems; Logging (forestry); Mapping; Remote sensing; Classification accuracy; Ecosystem functions; Forest inventory and analysis; Northwest Forest Plan; Reference condition; Satellite remote sensing; USDA Forest Service; Vegetation condition; Satellite imagery; ecosystem function; forest ecosystem; forest management; habitat type; Landsat; quantitative analysis; remote sensing; satellite data; snag; timber harvesting; wild population; Animals; Data; Ecosystems; Forest Management; Forests; Mapping; Remote Sensing; Trees; Oregon; Pacific Northwest; United States; Washington
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/154918
作者单位	USDA Forest Service, Pacific Northwest Research Station, United States; USDA Forest ServiceNorthwest Region, United States; Oregon State University, Department of Forest Ecosystems and Society, United States
推荐引用方式 GB/T 7714	Bell D.M.,Acker S.A.,Gregory M.J.,et al. Quantifying regional trends in large live tree and snag availability in support of forest management[J],2021,479.
APA	Bell D.M.,Acker S.A.,Gregory M.J.,Davis R.J.,&Garcia B.A..(2021).Quantifying regional trends in large live tree and snag availability in support of forest management.Forest Ecology and Management,479.
MLA	Bell D.M.,et al."Quantifying regional trends in large live tree and snag availability in support of forest management".Forest Ecology and Management 479(2021).