Comparitive regeneration control and limiting value of browsing damage intensity
2003
Rueegg, D. (Kaltbrunn (Switzerland)) | Nigg, H.
Storms such as Lothar often bring to light what has previously lain hidden in dark forests, thereby heightening our perception of problems in the realms of forest and game. Hunting and forestry measures can solve these problems and basic information is important in order to determine suitable measures. This is why regeneration control is called for after every storm to gather up-to-date information on forest regeneration and the influence of game. A collecting concept must include a supply of data from many levels. In a first step, on the basis of a survey assessment, we ask whether the region under investigation is a problem area or not and regions are accordingly assigned to one of either category. In a second step, measurements are carried out on samples in chosen indicator areas. These indicator areas are between 30 and 50 ha and representative of the forest and game conditions of the whole. In this phase woodland plants are inventoried according to the vegetation period of the previous year and the dormant phase directly preceding the time of the survey in spring according to tree species, size and damage to crown shoots. In a third step, silvicultural reference plots of around 0.5-1.0 ha serve to evaluate the undertaken measures and to compare the silvicultural goals on the stand level. Silvicultural evaluation is best carried out for the proportion of tree species in increment and growth stages, as well as for the distribution of tree species over sylvicultural reference plots, although not for the number of stems, as fluctuation is high in natural regeneration.
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