Das waldbauliche Prognose- und Entscheidungsmodell BWINPro 6.1 : Neuparametisierung und Modellerweiterungen

2002

S. 486-493

39 Lit. Ang.

Unselbständiges Werk

200092388

In the past three years the user-friendly silvicultural decision support system BWINPro 6.1 was developed from the single-tree growth model BWIN 3.2 of the Niedersächsische Forstliche Versuchsanstalt (Nagel 1999 a). The improved model predicts individual tree growth in pure and mixed stands, simulates different management strategies and evaluates the effects on stand structure, stand quality as well as yield and other economic indices. Figure 1 displays the different functions and moduls of BWINPro. The requirements for data input, the possible paths for predicting stand development, the provided results and the interfaces to other software are described. A detailed overview of the new parametrisation and the program's extensions compared to BWIN 3.2 is given. The new crown width and height to crown base functions as well as the diameter and height increment models are shown in table 1. Comparing the model's diameter increment predictions with a yield table estimation reveals the model's superiority (table 2). As new program moduls a model to estimate height variance within the data generation process, an evaluation tool to assess the quality of the growth prediction, a rule-based elite tree selection algorithm, a thinning routine to imitate the selective thinning concept of the Lower Saxony Forest Service and the expert system ThiCon to predict thinnings on a single tree basis are introduced. New taper, branch size and branch state models are also included and used in size and quality assortment routines.