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Annals of Forest Science : Volume 66, Issue 1, January 2009

Annals of Forest Science : Volume 65

Annals of Forest Science : Volume 64

Fuel and stand conditions in an isolated, unmanaged forest landscape in central Oregon

Content Provider	Springer Nature Link
Author	Stanton, Sharon Arabas, Karen B.
Copyright Year	2009
Abstract	• Mature, unmanaged forests in western North America provide important reference conditions for managers, yet little is known about fuel composition and the factors that influence fuel accumulation in such stands. Our objectives were to characterize fuels in a passively managed landscape of dry forests in central Oregon and identify environmental factors influencing fuel accumulation. • Ordination techniques and analysis of variance revealed no statistical differences in total fuel loads across a wide range of environmental conditions. • Individual fuel size classes, however, did vary by stand location and composition. Interior stands had more 1- to 100-h fuels and snags than stands at or near the edge, stands dominated by ponderosa pine had fewer small-diameter fuels and snags, lodgepole pine stands had more 1-h fuels and snags, and white fir stands had more 10-h fuels, duff, and snag basal area. • Tree species, density and age, and years since last fire were the most important environmental variables, explaining 23% of the variation in fuels. • Our results present further evidence that fuel composition is highly variable at many spatial and temporal scales. They also provide useful baseline information for managers of fire-prone western forests. • Les forêts matures et non gérées de l’Ouest Américain fournissent des situations de référence importantes pour les gestionnaires. Cependant, il n’y a que peu d’informations sur la nature des combustibles et des facteurs qui influent sur l’accumulation de combustible dans ces peuplements. Nos objectifs étaient de caractériser la charge en combustible dans un paysage forestier non géré du centre de l’Oregon et d’identifier les facteurs environnementaux modulant l’accumulation de combustible. • Des techniques d’ordination et une analyse de variance n’ont révélé aucune différence statistique des charges de combustibles dans un large éventail de conditions stationelles. • Les charges en combustible variaient cependant suivant la localisation des peuplements et leur composition. Les zones internes des peuplements présentaient plus de charge en combustible de dimensions moyennes et de souches que les lisières. Les peuplements dominés par Pinus ponderosa présentent moins de combustible de faible diamètre et de chicots par rapport à ceux de Pinus contorta. Enfin, les peuplements d’Abies concolor ont plus de combustibles de faible diamètre, et de chicots. • Les espèces d’arbres, la densité et l’âge et le délai depuis le dernier incendie ont été les variables les expliquant la plus forte part de la variabilité de charge en combustible (23 %). • Nos résultats démontrent une fois de plus que la composition du combustible est très variable à plusieurs échelles spatiales et temporelles. Ils fournissent également des données de référence utiles pour les gestionnaires des forêts de l’ouest sujettes aux incendies.
Starting Page	207
Ending Page	207
Page Count	1
File Format	PDF
ISSN	12864560
Journal	Annals of Forest Science
Volume Number	66
Issue Number	2
e-ISSN	1297966X
Language	French
Publisher	Springer Netherlands
Publisher Date	2009-01-01
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Combustibles déchets de bois grossiers risque d’incendie forêts anciennes Forestry Wood Science & Technology Forestry Management Tree Biology Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Forestry

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