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Gewählte Publikation:

Sterba, H; Blab, A; Katzensteiner, K.
(2002): Adapting an individual tree growth model for Norway spruce (Picea abies L. Karst.) in pure and mixed species stands

PROGNAUS is an individual tree growth model, containing a major sub-model which depicts basal area growth as a function of tree size, competition and a set of diagnostic site variables. The coefficients of this model have previously been estimated using the data from the Austrian National Forest (ANF) inventory. The examination of 60 new sample plots in two Austrian growth districts showed that the increment of Norway spruce (Picea abies L. Karst.) in pure spruce stands was overestimated by this model while it was underestimated in mixed species stands with European beech (Fagus sylvatica L.). In order to adapt PROGNAUS to account for this effect, the data of the 60 plots were used to modify PROGNAUS by adding quantitative soil characteristics and the percentage of Not-way spruce as variables. The markedly improved model accounts for the effect that in a given stand, below a certain competition level, Norway spruce grows better in the pure stand than in an otherwise comparable mixed species stand. These small spruce trees in mixed stands have a shallow rooting system and therefore suffer from water stress, which is caused by the competing European beech with its higher water consumption. and deeper rooting system. Adding the Norway spruce proportion as an independent variable into the original model and re-parameterising it with the data of the ANF inventory, reveals that this effect can be generalised to some extent, but differs in magnitude depending on the geological substrate. (C) 2002 Elsevier Science B.V. All rights reserved.
Autor*innen der BOKU Wien:
Katzensteiner Klaus
Sterba Hubert

Find related publications in this database (Keywords)
"individual tree growth model
mixed species stands
Picea abies L. Karst.
Fagus sylvatica L."

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