Zunehmende Unstimmigkeit zwischen erwartetem und wirklichem Wachstum unserer Waldbestände - Konsequenzen für zukünftige ertragskundliche Informationssysteme

Translated title of the contribution: Increasing discrepancy between expected and real growth of our forest stands Consequences for future yield information systems

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20 Scopus citations

Abstract

In former times, emphasis of research on forest growth was focused mainly on finding out about the conditions of stand development under clearly defined and stable growth conditions. Since the midseventies, scientific interest has shifted to other factors: growth reactions caused by weather by element input and output, anti by biotic disruptive factors. It is shown that the normal growth behaviour ("normal" means the expected behaviour according to the data of our yield tables) of fir, spruce, pine, and beech is dominated by global interference factors to a much greater extent than previously believed. The present situation of the science of forest growth research is as follows: It is being recognized that discrepancies between the real growth processes of our forest stands and expected values of our yield tables are increasing. But forest science is far from being able to replace the present yield tables (which, of course, need "renovation") by a more effective information system. However, the actual discrepancies between expected and real growth (which certainly will increase further in the future) can help us to deduce some important consequences for structuring future yield information systems. Firstly such systems should be able to put to practical use more rapidly all available information in the field of forest growth research. Only then a teat basis for planning, control, and implementation can be created - and, simultaneously, the model will be able to simulate real growth conditions with only minor delay. The faster the change of the production conditions, the faster and the more efficient should be the use of data collected by actual surveys for actualizing our existing growth models. For model parameterizing, new basic yield data from permanent forest survey sample plots will increasingly become available in the future in addition to the data collected on long-term experimental sample plots. A second consequence has to do with the structure of the model: Future growth models should be flexible in a way that they can be expanded and also adapted to any change in the ecological conditions without radical modification of the entire model. Thirdly, the objective should be to design growth models which, besides demonstrating the effects of different forestal measures, can also project growth reactions and development scenarios for different interference factors. She synthesis of new growth models which can provide valuable prognostic data even under variable growth conditions demands a new approach at all three levels of forest growth research: data collection, organization and evaluation of these data, and concentrating the data in growth models.

Translated title of the contributionIncreasing discrepancy between expected and real growth of our forest stands Consequences for future yield information systems
Original languageGerman
Pages (from-to)366-382
Number of pages17
JournalForstwissenschaftliches Centralblatt
Volume111
Issue number1
DOIs
StatePublished - Dec 1992

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