Wuchsmodelle für Mischbestände als Herausforderung für die Waldwachstumsforschung

Translated title of the contribution: Growth models for mixed forest tree stands as a challenge for growth and yield research

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Based on data material obtained by long-term observation of pure and mixed forest stands of spruce and beech, a single-stem growth simulator for mixed stands of spruce and beech is developed. The basic items of the simulator are several functions for controlling development of height and crown width as well as changes of the positions of the crown, diameter growth, and mortality of single trees as related to their respective growth constellation. These control functions take into account the fact that growth reactions of a tree with regard to other trees are specific to each species. Beech, for example, is more tolerant to shade than spruce. Besides, competition and control functions depend on the neighbourhood of a tree; neighbouring beeches, for example, are more light-transmissive than neighbouring spruces. After specifying the initial situation on a test plot the simulator reproduces the growth development of all stems of a stand as related to their lateral crown restriction ε and their amount of shade ω in intervals of five years. Changes in stand structure during the prognosis period can be reproduced with the help vertical sectional drawings of the stand. The simulator generates statements of the development of every single stem on a plot and also frequency statements on the dimension of single stems; in addition, it summarizes the different yield elements of the plot in performance tables which have the structure of the classical yield tables. The model version presented here reproduces the growth of sprouts above ground in dependence on light available and lateral competitive situation. The model can be extended when new information is given, for instance information about growth in the root zone.

Translated title of the contributionGrowth models for mixed forest tree stands as a challenge for growth and yield research
Original languageGerman
Pages (from-to)87-105
Number of pages19
JournalForstwissenschaftliches Centralblatt
Volume111
Issue number1
DOIs
StatePublished - Dec 1992
Externally publishedYes

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