DOI: 10.1016/j.foreco.2015.10.041
Scopus记录号: 2-s2.0-84946012600
论文题名: Local-scale and regional climate controls on historical fire regimes in the San Juan Mountains, Colorado
作者: Bigio E.R. ; Swetnam T.W. ; Baisan C.H.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 360 起始页码: 311
结束页码: 322
语种: 英语
英文关键词: Fire history
; Fire scars
; Fire-climate
; Local-scale
; Regional scale
; San Juan Mountains
; Topography
Scopus关键词: Drought
; Forestry
; Landforms
; Topography
; Fire history
; Fire scars
; Local scale
; Regional scale
; San Juan Mountains
; Fires
; age structure
; cohort analysis
; coniferous forest
; drought
; fire behavior
; fire history
; forest fire
; frequency analysis
; recruitment (population dynamics)
; regional climate
; topography
; tributary
; watershed
; Colorado
; Rocky Mountains
; San Juan Mountains
; United States
; Coniferophyta
英文摘要: In ponderosa pine and mixed conifer ecosystems of the Southwestern US, regional-scale climate tends to synchronize fire years among study sites and increase fire extent or severity within a forest. At landscape scales (1-100km2), fire frequency and severity may also be influenced by local-scale differences in elevation and aspect, including fire barriers in rugged terrain. This study examines local-scale and regional controls of past fire regimes in three tributary watersheds of the San Juan Mountains of southwestern Colorado. In each watershed, we sampled fire-scarred trees and tree age structure and identified fire years and cohorts of post-fire tree recruitment. Fire frequency varied by aspect, and we observed the largest differences between the north- and south-facing aspects in the two largest basins. Fire severity was also different by aspect, with low-severity fire regimes on south-facing slopes and mixed-severity fire on north-facing slopes. The majority of fire years were unique, single-basin fires, indicating a lack of synchrony of fire years among basins, which we attributed to fire barriers and rugged terrain. We conducted Superposed Epoch Analysis (SEA) on two groups of fire years, to show average climate conditions before and during fire years. The first group were unique single-basin fires (n=27) and the second group included all years when synchronous fire burned in two or three basins (n=15). Both groups had significantly dry Palmer Drought Severity Index (PDSI) values during the fire year (p<0.01), while the second group also showed significantly wet conditions for two years prior to the fire year (p<0.01). Steep topography and fire barriers likely reduced the influence of regional climatic on the frequency and timing of fires for individual basins, though fires still burned during years of regional drought. Rugged terrain also contributed to asynchronous fire years among basins and longer fire return intervals compared with other ponderosa pine and mixed conifer forests in the region. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65172
Appears in Collections: 影响、适应和脆弱性
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作者单位: University of Arizona, Laboratory of Tree-Ring Research, 1215 E. Lowell St., Tucson, AZ, United States
Recommended Citation:
Bigio E.R.,Swetnam T.W.,Baisan C.H.. Local-scale and regional climate controls on historical fire regimes in the San Juan Mountains, Colorado[J]. Forest Ecology and Management,2016-01-01,360