气候变化领域集成服务门户(CCPortal): Disentangling the role of prefire vegetation vs. burning conditions on fire severity in a large forest fire in SE Spain

CCPortal

DOI	10.1016/j.rse.2020.111891
	Disentangling the role of prefire vegetation vs. burning conditions on fire severity in a large forest fire in SE Spain
	Viedma O.; Chico F.; Fernández J.J.; Madrigal C.; Safford H.D.; Moreno J.M.
发表日期	2020
ISSN	00344257
卷号	247
英文摘要	Fire severity is a function of dynamic interactions between vegetation and burning conditions. To understand the factors that control it, accurate methods for estimating prefire vegetation structure and composition as well as fire propagation conditions are required. Here we analyzed the spatial variability of fire severity in a mixed-severity fire (3217 ha) that occurred in southeast Spain (Yeste, Albacete) from 27th July to 1th August 2017, burning mostly a pine woodland, including part of an earlier fire in 1994. Fire severity was estimated using three satellite-based indices derived from the Normalized Burn Ratio (NBR) using Sentinel 2 and Landsat 8 images from the dates before and immediately after fire. The field-based Composite Burn Index (CBI) was used for validation. Prefire vegetation conditions and fuel models were derived from LiDAR metrics and other vegetation data. Fire propagation conditions were estimated based on a fire progression map provided by the Forestry Services of Castilla-La Mancha. In addition, hourly fire weather and aligned (i.e., in the sense of the propagating fire-front) slope and wind speed were calculated for each burning period. Regression models using different spectral fire severity indices and their driving factors were obtained applying Boosted Regression Trees (BRTs). Fire severity was highly predicted by both burning conditions and prefire vegetation (mean adjusted R2 [Adj.R2]: 86% ± 0.04 and 68% ± 0.05 for training and validation sets, respectively). Alone, burning conditions explained more variance than LiDAR metrics and vegetation separately. The single variables that contributed most to the models were the rate of spread of the fire-front, biomass proxies (i.e., Leaf Area Index [LAI] and fraction of Photosynthetically Active Radiation [fPAR]) and understory vegetation (i.e., density of LiDAR points 1–2 m). Higher fire severity occurred in areas burning uphill, with a high rate of spread driven by high velocity winds and under high maximum temperature. Fire severity was high in wooded stands that were heterogeneous in height, composed by scattered and small Pinus halepensis trees, with high and homogeneous understory cover. In contrast, lower fire severity occurred in mature stands dominated by tall Pinus pinaster and Pinus nigra trees. There were strong interactions between vegetation, weather, fire-aligned topography and rate of spread. Because vegetation variables were important drivers of fire severity, even under extreme fire weather conditions, fuel management treatments to limit fire severity and, potentially, fire size should be implemented. © 2020 Elsevier Inc.
英文关键词	Fire history; Fire propagation; Fire severity; Fire weather; Landsat 8 OLI; LiDAR; Prefire vegetation; Sentinel 2 MSI; Topography
语种	英语
scopus关键词	Deforestation; Logistic regression; Optical radar; Topography; Vegetation; Wind; Boosted regression trees; Composite burn indices; Dynamic interaction; Fraction of photosynthetically active radiations; Maximum temperature; Spatial variability; Strong interaction; Understory vegetation; Fires; climate conditions; forest fire; lidar; satellite data; satellite imagery; spatial variation; spatiotemporal analysis; understory; vegetation cover; woodland; Albacete [Castilla-La Mancha]; Castilla-La Mancha; Spain; Pinus halepensis; Pinus nigra; Pinus pinaster
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179233
作者单位	Departamento de Ciencias Ambientales, Universidad de Castilla-La Mancha, Avda. Carlos III s/n, Toledo, 45071, Spain; Gestión Ambiental de Castilla-La Mancha, S.A. (GEACAM), C/ Río Cabriel, 44, Toledo, 45007, Spain; Department of Environmental Science and Policy, University of California, Davis, Davis, CA 95616, United States; USDA Forest Service, Pacific Southwest Region, Vallejo, CA 94592, United States
推荐引用方式 GB/T 7714	Viedma O.,Chico F.,Fernández J.J.,et al. Disentangling the role of prefire vegetation vs. burning conditions on fire severity in a large forest fire in SE Spain[J],2020,247.
APA	Viedma O.,Chico F.,Fernández J.J.,Madrigal C.,Safford H.D.,&Moreno J.M..(2020).Disentangling the role of prefire vegetation vs. burning conditions on fire severity in a large forest fire in SE Spain.Remote Sensing of Environment,247.
MLA	Viedma O.,et al."Disentangling the role of prefire vegetation vs. burning conditions on fire severity in a large forest fire in SE Spain".Remote Sensing of Environment 247(2020).