Growth reduction in harvest-age, coniferous forests with residual trees in the western central Cascade Range of Oregon

Zenner, Eric K.; Acker, Steven A.; Emmingham, William H.

doi:10.1016/s0378-1127(97)00108-4

Cited by 42 publications

(55 citation statements)

References 12 publications

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“…Although some studies have found that thinning increased the density of young trees in the understory (Zenner et al, 1998), we found no impact of stand density on abundance or composition of saplings/suckers of overstory trees, including the early successional and highly valued species, quaking …”

Section: Discussioncontrasting

confidence: 92%

Effects of stand density on ecosystem properties of subalpine forests in the southern Rocky Mountains, USA

Hall¹,

Marchand²

2010

Ann. For. Sci.

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Abstract• Mixed coniferous, subalpine forest communities in the Rocky Mountains are historically dense and have experienced infrequent, high-severity fire. However, many of these high-elevation stands are thinned for a number of perceived benefits.• We explored the effects of forest stand density on ecosystem properties in subalpine forests in Colorado, USA, 17-18 y after forests were managed for timber.• Forest structure significantly altered the composition and chemical signature of plant communities. Previously managed stands contained lower density of overstory trees and higher ground cover compared to paired reference stands. Foliar phenolic concentration of several species was negatively related to basal area of overstory trees. Furthermore, reductions in stand density increased total foliar phenolic:nitrogen ratios in some species, suggesting that gap formation may drive long-term changes in litter quality. Despite significant changes in forest structure, reductions in stand density did not leave a strong legacy in surface soil properties, likely due to the integrity of soil organic matter reserves.• Changes in forest structure associated with past management has left a long-term impact on plant communities but has only subtly altered soil nutrient cycling, possibly due to trade offs between litter decomposability and microclimate associated with reductions in canopy cover. Mots-clés :chimie foliaire / composés phénoliques / cycle de l'azote du sol / densité du peuplement / biogéochimie Résumé -Effets de la densité du peuplement sur les propriétés des écosystèmes des forêts subalpines dans le sud des Montagnes Rocheuses aux USA.• Les communautés subalpines de forêts mixtes de conifères dans les Montagnes Rocheuses sont historiquement denses et ont peu connu de feux très sévères. Cependant, beaucoup de ces peuplements de haute altitude sont éclaircis pour de nombreux profits.• Nous avons étudié les effets de la densité des peuplements forestiers sur les propriétés des éco-systèmes dans les forêts subalpines du Colorado (USA), 17-18 ans après que les forêts aient été exploitées pour le bois.• La structure de la forêt a considérablement modifié la composition et la signature chimique des communautés végétales. Auparavant les peuplements exploités renfermaient une plus faible densité d'arbres de l'étage dominant et une couverture du sol plus importante par rapport aux peuplements de référence correspondants. La concentration des composés phénoliques foliaires de plusieurs espèces a été liée négativement à la surface terrière des arbres dominants. En outre, les réductions de la densité du peuplement ont augmenté les rapports composés phénoliques foliaires totaux : azote chez certaines espèces, ce qui suggère que la formation de trouée peut conduire à des changements à long terme de la qualité de la litière. Malgré d'importants changements dans la structure forestière, la réduction de la densité du peuplement n'a pas laissé un héritage solide dans les propriétés de surface du sol, probablement à cause de l'inté...

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Section: Discussioncontrasting

confidence: 92%

Effects of stand density on ecosystem properties of subalpine forests in the southern Rocky Mountains, USA

Hall¹,

Marchand²

2010

Ann. For. Sci.

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“…Even-aged stands and plantations have been the greatest focus of attention for forest economics until now. Conversely, studies on GTR have mainly been concentrated on the relationship between the levels of Green Tree Retention and growth reduction [1,18,27,34], structural complexity [33], and on GTR contribution to biodiversity [19]. Yet the economic implications of Green Tree Retention have been largely ignored until now.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of new silvicultural alternatives for Scots pine stands in northern Spain

Bravo¹,

Dı́az-Balteiro

2004

Ann. For. Sci.

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-The new objectives which society is demanding of forest systems are leading to deep changes in their management. Aspects such as biodiversity preservation and recreation require forest management alternatives that are not based on the traditional management centered on the maximization of timber production. In this paper, we introduce five silvicultural alternatives different from those typically implemented. They are characterized by combining more intensive management practices in four cases, with the retention of a portion of the stand in the final cutting, and the extension of rotation to fulfill these non-timber producing objectives in the other case. The results for one stand of Pinus sylvestris L. in the north of Spain have been evaluated in physical terms (total volume, veneer volume), as well as in financial terms (Land Expectation Value, LEV), showing some of the alternatives its feasibility in comparison with traditional management. silviculture / green tree retention / Pinus sylvestris L. Résumé -Évaluation de nouvelles alternatives sylvicoles pour des peuplements de pins sylvestres dans le nord de l'Espagne. Les nouveaux objectifs que la société demande aux systèmes forestiers provoquent actuellement de profonds changements dans la gestion de ces derniers. Des aspects tels que la conservation de la biodiversité ou la jouissance récréative requièrent des modèles de gestion forestière non fondés sur la gestion traditionnelle qui est axée sur la maximisation de la production du bois. Ce travail présente cinq alternatives sylvicoles du sylviculture traditionel, qui se caractérisent, dans 4 cas, par la combinaison d'une gestion plus intensive avec la rétention d'une partie du peuplement dans la coupe finale et, dans le dernier cas, par l'extension de la rotation afin d'atteindre ces nouveaux objectifs. Les résultats pour un peuplement de Pinus sylvestris L. dans le nord de l'Espagne ont été évalués en termes de production (volume total, volume de contreplaqué) ainsi qu'en termes financiers (Valeur Potentielle du Sol, VPS), et certaines des alternatives ont montré leur viabilité par comparaison avec la gestion traditionnelle. silviculture / rétention du peuplement / Pinus sylvestris L.

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“…The C d abundance of planted L. kaempferi was significantly reduced in the nearby area (Tables 1, 3), presumably as a result of the shading effect of retained trees (Rose and Muir 1997;Acker et al 1998;Zenner et al 1998;Valkonen et al 2002;Jakobsson and Elfving 2004). In comparison with the intermediate and the faraway areas, the reduction of this species as measured by basal area reached 36% and 54%, respectively.…”

Section: Discussionmentioning

confidence: 94%

Stand structure and composition of a 60-year-old larch (Larix kaempferi) plantation with retained hardwoods

Yoshida

Hasegawa

Taira

et al. 2005

Journal of Forest Research

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Tree retention is understood as a key practice in creating complexity, leading to heterogeneity in resources and habitats in managed stands. In this article, we clarify the long-term effects of tree retention on stand structure and tree-species composition in a 60-year-old Larix kaempferi plantation in central Japan. In our study plot (1.5 ha) there were 18 stems/ha of retained trees (determined by tree-ring analysis), mostly Quercus crispula. We conducted spatial analyses and tested the hypothesis that tree abundance, size structure, and species composition and diversity change with distance from the retained trees. Near the retained trees, L. kaempferi showed a reduction of 40%-60% in basal area, due presumably to the shading effect. In contrast, the nearby area showed greater species diversity in the canopy layer. The retained trees created patches of different species composition in the understory. The spatial gradient of shade and colonization opportunity provided by retained trees greatly affect the distribution of the colonized species, according to their shade tolerance and seeddispersal ability, which resulted in the stand structure with a heterogeneous shrub-layer vegetation. Retention proved particularly important for the enhancement and long-term maintenance of structural and compositional complexity in L. kaempferi plantations.

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Growth reduction in harvest-age, coniferous forests with residual trees in the western central Cascade Range of Oregon

Cited by 42 publications

References 12 publications

Effects of stand density on ecosystem properties of subalpine forests in the southern Rocky Mountains, USA

Effects of stand density on ecosystem properties of subalpine forests in the southern Rocky Mountains, USA

Evaluation of new silvicultural alternatives for Scots pine stands in northern Spain

Stand structure and composition of a 60-year-old larch (Larix kaempferi) plantation with retained hardwoods

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