Silviculture of mixed conifer forests in eastern Oregon and Washington.

Seidel, Kenneth W.; Cochran, P.H.

doi:10.2737/pnw-gtr-121

Cited by 10 publications

(11 citation statements)

References 10 publications

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“…whether to leave slash untreated on site, or to choose among candidate treatments for slash (e.g., broadcast burning, pile burning, mastication), represents tradeoffs among balancing fire hazard, economic costs, limiting insect/disease potential that can be exacerbated through concentrating dead wood, and aesthetics (Seidel and Cochran, 1981;Kreye et al, 2014). Further research that compares influences of slash treatment methods on vegetation in the short and long term in mixed conifer forest is warranted.…”

Section: Short-term Declines: Importance Of Time Overstory Slash Pmentioning

confidence: 98%

Effects of tree cutting and fire on understory vegetation in mixed conifer forests

Abella

Springer

2015

Forest Ecology and Management

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Section: Short-term Declines: Importance Of Time Overstory Slash Pmentioning

confidence: 98%

Effects of tree cutting and fire on understory vegetation in mixed conifer forests

Abella

Springer

2015

Forest Ecology and Management

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“…Dominant conifers left on the site will compete with the underplanted seedlings for resources, thereby reducing seedling survival (Seidel and Cochran 1981;Tesch and Mann 1991;. Competition may be especially detrimental to seedlings underplanted beneath thinned second-growth stands with vigorous overstories.…”

Section: Overstory Density Managementmentioning

confidence: 99%

Underplanted conifer seedling survival and growth in thinned Douglas-fir stands

Brandeis¹,

Newton²,

Cole³

2001

Can. J. For. Res.

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In a multilevel study to determine limits to underplanted conifer seedling growth, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), grand fir (Abies grandis (Dougl. ex D. Don) Lindl.), western redcedar (Thuja plicata Donn ex D. Don), and western hemlock (Tsuga heterophylla (Raf.) Sarg.) seedlings were planted beneath second-growth Douglas-fir stands that had been thinned to basal areas ranging from 16 to 31 m 2 /ha. Understory vegetation was treated with a broadcast herbicide application prior to thinning, a directed release herbicide application 2 years later, or no treatment beyond harvest disturbance. Residual overstory density was negatively correlated with percent survival for all four species. Broadcast herbicide application improved survival of grand fir and western hemlock. Western redcedar, grand fir, and western hemlock stem volumes were inversely related to overstory tree density, and this effect increased over time. There was a strong indication that this was also the case for Douglas-fir. Reduction of competing understory vegetation resulted in larger fourth-year stem volumes in grand fir and western hemlock.Résumé : Des semis de douglas de Menzies (Pseudotsuga menziesii (Mirb.) Franco), de sapin grandissime (Abies grandis (Dougl. ex D. Don) Lindl.), de thuya géant (Thuja plicata Donn ex D. Don) et de pruche de l'Ouest (Tsuga heterophylla (Raf.) Sarg.) ont été plantés dans des peuplements de seconde venue de douglas de Menzies qui avaient été éclaircis en laissant une surface terrière variant de 16 à 31 m 2 /ha dans le cadre d'une étude à niveaux multiples qui visait à déterminer les conditions limites pour la croissance de semis de conifères plantés en sous-étage. La végétation de sous-étage a été traitée avec un épandage à la volée d'herbicide avant l'éclaircie, une application locale d'herbicide après deux ans ou n'avait subi d'autre traitement que la perturbation causée par la récolte. La densité résiduelle de l'étage dominant était négativement corrélée au pourcentage de survie chez les quatre espèces. L'épandage d'herbicide à la volée a amélioré la survie du sapin grandissime et de la pruche de l'Ouest. Le volume de la tige du thuya géant, du sapin grandissime et de la pruche de l'Ouest était inversement proportionnel à la densité des arbres dominants et cet effet a augmenté avec le temps. Tout porte à croire que cela était également le cas pour le douglas de Menzies. La suppression de la végétation compétitrice en sous-étage s'est traduite par un volume de la tige plus grand après quatre ans chez le sapin grandissime et la pruche de l'Ouest.[Traduit par la Rédaction] Brandeis et al. 312

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“…In uneven-aged forests such as our study area, most trees experience periods of growth suppression and competitive release (Seidel and Cochran 1981). Site conditions at the Bear Valley Roost may have resulted in rapid growth of Douglas-fir and development of suitable characteristics for roosting at an earlier age and at smaller diameters relative to other conifers.…”

Section: Roost Treesmentioning

confidence: 97%

“…Succession to white fir dominance in subroosts 3 and 4 will close portions of the tree crown (Franklin and Dyrness 1973:158), make tree crowns less accessible to eagles, suppress growth of Douglas-fir and ponderosa pine in the smaller diameter classes (Seidel and Cochran 1981, Minore and Kingsley 1983, Agee 1990, and limit establishment of these important species of roost trees within the roost. Both…”

Section: Subroostsmentioning

confidence: 99%

“…from fire-adapted to fire-intolerant communities, resulting in fuel accumulations that have converted fire cycles from periodic surface fires to high-intensity crown fires (Seidel and Cochran 1981;Agee 1990Agee :35, 1993. Restoration of species composition and fire cycles in mixedconifer forests and other fire-adapted communities has received considerable attention from fire ecologists (Agee 1990(Agee , 1993 and regional forest health initiatives (U.S. Forest Service 1994).…”

mentioning

confidence: 99%

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