Forest condition inventory
The forest condition inventory (WZI) in Austria is the regular, nationwide survey of the average forest condition on 2,300 test areas . This strictly periodic time series of forest control measurements soon made it possible to identify some development trends in the previously feared forest decline and the effect of countermeasures.
After previous forest inventories , carried out at intervals of several years since 1961 , the Federal Forest Research Institute (Vienna) started the WZI observations around 1980 and has since repeated them annually on the same sample trees , so that reliable development trends became clear after just a few years (e.g. recovery through decrease of acid rain , but increase of windfall because of frequent storms that have become).
The 2300 test areas are laid out in a regular grid of around 10 km across Austria; On each sample area, geological , forest and soil science data were first collected and then - every year - the vitality of around 30 trees in a defined area was determined. The main indicator is the condition of the tree tops ("crown condition") with special attention to the so-called crown defoliation .
The experience from the WZI around 1990 showed that such a dense grid of the sample areas brings less than the recording of further vegetation and soil parameters, forest pathology and immissions . Therefore, within the framework of the forest damage observation system (WBS), the number of test areas was reduced to around 550 and the number of test trees to 7000, but the number of parameters recorded in each case increased significantly.
See also
- Forest inventory
- Air pollution , soil pollution
- Topsoil
- Soil erosion
- Geo-object
- Test area
- Time series analysis
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- Friedr. Ruhm et al .: 125 years of the Federal Forest Research Institute , Vienna 2000
- W. Kilian, J. Pollanschütz: Nationwide inventories of the forest condition with special consideration of pedological aspects . Report for the second GeoLIS Conference 1989 Proceedings geoscientific data in land information systems (Ed. G.Gerstbach ) Geowiss. Communication from TU Wien, Volume 33, p. 146-154.