Forest growth models
Forest growth models describe the dynamic changes in the forest based on the knowledge of forest growth theory . The organic matter produced by the forest trees is usually in the foreground. They can be used to estimate the quantitative extent of growth processes in the forest in relation to time, location and management . Their main application is in forest planning and operational control. They are an important basis for the sustainable security of many forest functions.
There are different approaches to model forest growth.
- In process models , one tries to depict the "processes" - such as photosynthesis . These models are mainly used for research and understanding.
- Plant architecture models are based on botanical laws and are also mainly developed and applied in research in the forestry sector.
- Gap models are particularly suitable for studying natural succession over long periods of time.
- Statistical models are built on the basis of test area observations. The yield tables, which have been used in forest operations forover 100 yearsto ensure sustainability ,alsobelong tothis type.
Each approach shows specific merits and weaknesses. For use in forestry practice, statistical models that build on the data of long-term experimental areas have proven themselves.
With regard to the resolution, a distinction is made between stand, distribution and single tree models. The latter have gained in importance as they can be used to predict the development of differently structured pure and mixed stocks in one model. For this purpose, the stand is broken down into its individual trees and these are described in their development. The individual tree data can then be aggregated again to form stock data. Such models can be divided into position-independent and position-dependent approaches. Position-independent models have the advantage that they do not require the root coordinates of each individual tree as input information, which in the past was only determined for very few test areas. Therefore, many existing data sources can be used for their parameterization . They have the disadvantage that they cannot be used to record different stand structures in such detail.
For the practical use of the forest growth models, so-called forest growth simulators were integrated into software . The two forest growth simulators BWINPro and Silva are used the most in Germany.
literature
- Hubert Hasenauer : Sustainable Forest Management, Growth Models For Europe , Springer, Berlin, Heidelberg 2006, ISBN 3-540-26098-6
- Nagel, Jürgen: Conceptual considerations for the step-by-step development of a forest growth simulation system for north-west Germany. Writings from the forestry faculty of the University of Göttingen and the Nieders. Forstl. Research institute, Volume 128, JD Sauerländer's Verlag 1999, Frankfurt a. M., p. 122
- Pretzsch, Hans: Modeling of the forest growth. Parey in Blackwell 2001. p. 336
Individual evidence
- ↑ http://www.nw-fva.de
- ↑ Archived copy ( memento of the original from February 19, 2013 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
