Radial growth patterns and the effects of climate on second-growth Douglas-fir (<i>Pseudotsuga</i><i>menziesii</i>) in the Siskiyou Mountains, Oregon

Little, Ronda L.; Peterson, David L.; Silsbee, David G.; Shainsky, Lauri J.; Bednar, Larry

doi:10.1139/x95-080

Cited by 26 publications

(23 citation statements)

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“…As indicated by Bormann et al [21] the mean C horizon depth is about 35 cm. The total soil inorganic material is comprised of 56% <2 mm, 7% 2-4 mm, and 37% >4 mm, and the <2 mm inorganic material is distributed as 26% clay, 37% silt, and 36% sand [21,22,42].…”

Section: Study Sitementioning

confidence: 99%

Long and Short-Term Effects of Fire on Soil Charcoal of a Conifer Forest in Southwest Oregon

Pingree

Homann

Morrissette

et al. 2012

Forests

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Abstract:In 2002, the Biscuit Wildfire burned a portion of the previously established, replicated conifer unthinned and thinned experimental units of the Siskiyou Long-Term Ecosystem Productivity (LTEP) experiment, southwest Oregon. Charcoal C in pre and post-fire O horizon and mineral soil was quantified by physical separation and a peroxide-acid digestion method. The abrupt, short-term fire event caused O horizon charcoal C to increase by a factor of ten to >200 kg C ha −1

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Section: Study Sitementioning

confidence: 99%

Long and Short-Term Effects of Fire on Soil Charcoal of a Conifer Forest in Southwest Oregon

Pingree

Homann

Morrissette

et al. 2012

Forests

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“…Mean January temperature is 6°C, and mean July temperature is 16°C. Mean annual precipitation is 206 cm, with most precipitation falling between October and May and only 15 cm falling between June and September (Little et al 1995). The geologic substrate is sandstone and schistphyllite, with Typic Hapludults and Typic Dystrochrepts as the dominant soil subgroups.…”

Section: Site Descriptionmentioning

confidence: 99%

“…The stand established after a stand-replacing fire in 1881, and tree age ranges from 90 to 120 years (Little et al 1995). The only management conducted in the stand prior to the establishment of these experimental treatments was fire suppression.…”

Section: Site Descriptionmentioning

confidence: 99%

Fuel treatments alter the effects of wildfire in a mixed-evergreen forest, Oregon, USA

Raymond¹,

Peterson²

2005

Can. J. For. Res.

145

131

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We had the rare opportunity to quantify the relationship between fuels and fire severity using prefire surface and canopy fuel data and fire severity data after a wildfire. The study area is a mixed-evergreen forest of southwestern Oregon with a mixed-severity fire regime. Modeled fire behavior showed that thinning reduced canopy fuels, thereby decreasing the potential for crown fire spread. The potential for crown fire initiation remained fairly constant despite reductions in ladder fuels, because thinning increased surface fuels, which contributed to greater surface fire intensity. Thinning followed by underburning reduced canopy, ladder, and surface fuels, thereby decreasing surface fire intensity and crown fire potential. However, crown fire is not a prerequisite for high fire severity; damage to and mortality of overstory trees in the wildfire were extensive despite the absence of crown fire. Mortality was most severe in thinned treatments (80%-100%), moderate in untreated stands (53%-54%), and least severe in the thinned and underburned treatment (5%). Thinned treatments had higher fine-fuel loading and more extensive crown scorch, suggesting that greater consumption of fine fuels contributed to higher tree mortality. Fuel treatments intended to minimize tree mortality will be most effective if both ladder and surface fuels are treated.Résumé : Les auteurs ont eu une occasion exceptionnelle de quantifier la relation entre les combustibles et la sévérité du feu en utilisant des données récoltées avant un incendie sur les combustibles de surface et dans la canopée ainsi que des données sur l'intensité du feu après un incendie de forêt. L'aire d'étude est une forêt mélangée de conifères du sud-ouest de l'Oregon avec un régime de feux d'intensité mixte. La modélisation du comportement du feu a montré que l'éclaircie a réduit les combustibles dans la canopée, ce qui a diminué le potentiel de propagation d'un feu de cime. Les risques d'initiation d'un feu de cime n'ont pas changé malgré la réduction des combustibles étagés parce que l'éclaircie a augmenté les combustibles de surface, ce qui a contribué à accentuer l'intensité du feu de surface. L'éclaircie suivie d'un brûlage au sol a réduit les combustibles dans la canopée, le long du tronc et en surface, diminuant par conséquent l'intensité du feu de surface et les possibilités d'un feu de cime. Cependant, un feu de cime n'est pas né-cessaire pour avoir un feu de forte intensité; les dommages et la mortalité chez les arbres de l'étage dominant causés par un incendie de forêt ont été importants malgré l'absence d'un feu de cime. La mortalité était la plus élevée dans les peuplements éclaircis (80-100 %), modérée dans les peuplements non traités (53-54 %) et la moins élevée dans les peuplements éclaircis et soumis à un brûlage dirigé (5 %). Les peuplements éclaircis avaient une quantité plus importante de combustibles fins et plus de roussissement des cimes, ce qui indique qu'une plus grande consommation de combustibles fins a contribué à une plus fort...

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“…These examples underscore the principle that the trees most sensitive to climate are found at the climatic limits of their distributions. Variation in tree responsiveness to climatic variables has been reported among species within a site and by individuals of a species between sites (Fritts 1976;Jacobi and Tainter 1988;Graumlich 1993;Villalba et al 1994;Jenkins and Pallardy 1995;Little et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Variation in radial growth responses to drought among species, site, and canopy strata

Orwig

Abrams

1997

Trees

242

148

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AbstractmRadial growth responses to drought were examined in the tree-ring records of six species growing within two locations of differing land-use history and soil moisture characteristics, and in overstory and understory canopy positions in northern Virginia. Tree species experienced differential ring-width reductions during or immediately following four severe drought periods occurring from 1930 to 1965 and were influenced by climatic variables including annual and summer temperatures, annual precipitation, and annual Palmer Drought Severity Index. Relative growth comparisons averaged across species before and after drought years indicated that understory trees on drymesic sites grew 11% faster after drought compared to predrought rates while mesic site trees in both canopy positions grew approximately 4% slower. Superposed epoch analysis indicated that Liriodendron tulipifera growing on mesic sites experienced greater ring-width reductions associated with drought than co-occurring, more drought-tolerant Quercus alba and Q. velutina. On dry-mesic sites, L. tulipifera also experienced greatly reduced growth as a result of drought but exhibited significant growth increases following individual drought events. Quercus alba was the only species that exhibited a consistent, significant ringwidth decrease associated with all droughts on dry-mesic sites. In contrast, Pinus virginiana was least impacted by drought on dry-mesic sites but was much more impacted by drought on mesic sites, indicating a drought × site interaction for this species. Overstory Carya glabra and Q. alba experienced larger growth decreases during drought on drymesic versus mesic sites. Understory tree growth reductions did not differ between site types but were often significantly larger than overstory responses of the same species on mesic sites. Following drought, most trees exhibited growth reductions lasting 2-3 years, although several species experienced reductions lasting up to 6 years. The results of this study suggest that tree rings represent an important long-term proxy for leaf-level ecophysiological measurements of growth responses to drought periods.

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Radial growth patterns and the effects of climate on second-growth Douglas-fir (Pseudotsugamenziesii) in the Siskiyou Mountains, Oregon

Cited by 26 publications

References 0 publications

Long and Short-Term Effects of Fire on Soil Charcoal of a Conifer Forest in Southwest Oregon

Long and Short-Term Effects of Fire on Soil Charcoal of a Conifer Forest in Southwest Oregon

Fuel treatments alter the effects of wildfire in a mixed-evergreen forest, Oregon, USA

Variation in radial growth responses to drought among species, site, and canopy strata

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