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Increment and yield in mixed stands with Norway spruce in southern Sweden

Lindén, Magnus (2003). Increment and yield in mixed stands with Norway spruce in southern Sweden. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230 ; 260
ISBN 91-576-6344-0
[Doctoral thesis]

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The productivity of mixed stands with Norway spruce is a matter of increasing importance in Swedish forestry. Non-wood factors, such as biodiversity issues, and the vast abundance of mixed stands, demonstrate a need for silvicultural methods that incorporate several tree species at the stand scale in the long-term. Until recently, such methods have been little studied, due to the predomintant use of monospecific stand types in practical forestry as well as in research. The work underlying this thesis was designed to contribute to our knowledge of mixed stands. Through both experimental and modelling approaches, increment and yield in mixtures with Norway spruce and Scots pine or birch or oak were studied. It was found that wood decay in Norway spruce caused by butt rot can be reduced using certain types of mixed stands, and that such stands usually have similar volume increment to the more productive monocultures on sites similar to those in this thesis. An experiment with long-term mixtures using spontaneously regenerated birch in spruce regeneration areas has been initiated and the mixtrues appear to be easy to manage according to a first evaluation. Productivity and economic performance of oak stands using spruce admixtures were evaluated, and indications of some beneficial effects (especially economic) were detected. The practice of retaining large deciduous trees in spruce stands for enhancing biodiversity was analysed. The results suggest that to minimise growth reductions in the spruce crop, retained green trees should be clustered rather than spread out. Mixtures consisting of two tree species are suggested to generally display a compensatory growth pattern between tree species, in which one is usually favoured at the expense of the other. Growth in the individual tree species may be very different from its corresponding growth in monoculture, whereas total prductivity appears to be more similar to the mean yield of the two corresponding monocultures. Variability in stem size in mixed stands, which can be explained by differences in the growth parameters of the associated tree species, tended to increase for parameters such as height distribution and diameter distribution in the total population, whereas for the individual tree species, a more clustered distribution was noted in some of the studied mixtures.

Authors/Creators:Lindén, Magnus
Title:Increment and yield in mixed stands with Norway spruce in southern Sweden
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :April 2003
Number of Pages:42
ALLI. Lindén, M. and Vollbrecht, G., 2002. Sensitivity of Picea abies to butt rot in pure stands and in mixed stands with Pinus sylvestris in southern Sweden. Silva Fennica 36:767-778. II. Lindén, M. and Agestam, E., 2002. Increment and yield in mixed and monoculture stands of Pinus sylvestris and Picea abies based on an experiment in southern Sweden. (In press, Scandinavian Journal of Forest Research) III. Lindén M. 2002. Increment in a recently established experiment with single-storied intimate mixtures of Picea abies and Betula spp. in southern Sweden. (Manuscript) IV. Lindén, M. and Ekö, PM. 2002. Increment and economic performance in a mixed forest with Quercus robur and Picea abies compared to monocultures. (Manuscript) V. Lindén, M. and Örlander, G. 2002. The effect of retaining large deciduous trees on the 25-year increment in planted understorey of Picea abies. (Manuscript)
Place of Publication:Alnarp
Publisher:Department of Southern Swedish Forest Research Centre, Swedish Univiversity of Agricultural Sciences
ISBN for printed version:91-576-6344-0
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
Subjects:Not in use, please see Agris categories
Agrovoc terms:picea abies, pinus sylvestris, betula, quercus robur, mixed forests, diameter increment, volume, yields, plant competition, forest health, fungal diseases, heterobasidion annosum, stems, root rots
Keywords:Betula spp., butt rot, compensatory growth, competition model, diameter, height, Heterobasidion annosum, increment, layering, logistic regression, mixed stand, mixture, Norway spruce, Picea abies, Pinus sylvestris, Quercus robur, stem distribution, volume, yield
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ID Code:218
Faculty:S - Faculty of Forest Sciences
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: Staff Epsilon
Deposited On:07 Apr 2003 00:00
Metadata Last Modified:08 Oct 2020 10:37

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