کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6542583 159162 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Local-scale and regional climate controls on historical fire regimes in the San Juan Mountains, Colorado
ترجمه فارسی عنوان
کنترل های اقلیمی محلی و منطقه ای بر روی رژیم های تاریخی آتش سوزی در کوه سن جون، کلرادو
کلمات کلیدی
کوه های سن جوان، تاریخ آتش سوزی، آتش آب و هوا، زخم های آتش، توپوگرافی، مقیاس محلی، مقیاس منطقه ای،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی
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 (1-100 km2), 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 360, 15 January 2016, Pages 311-322
نویسندگان
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