Stand-Table technique for the comparison of results of silvicultural treatments in the natural high forest

Wien

1980

S. 129-137

2 Tab., 1 Lit. Ang.

Unselbständiges Werk

200142543

This study evaluates the response of the natural forest stand to 13 silvicultural treatments in terms of the growth of individual trees. Stand tables were prepared from increment by the use of UPDATE program which combines and summarises data from recurrent numbered trees. The UPDATE program gave the number of individuals per species per plot, the total basal area for each species in 1967 and 1975, and the mean increment per tree per annum for each species. There wa a high variation in diameter increment within and between species. However, most species performed best under treatment 12 (Annual climber cutting and exploitation in 1962). Treatment 13, the control, with no silvicultural treatment, but exploitation in 1962, produced the lowest average increment per tree per annum. Chi-squared tests showed that treatment 12 produced the most pronounced shift from the lower to the upper size clsses between 1967 and 1975. The rate of diamter increment seemed generally slower and conditions of severe canopy opening- possibly the residual stand after heavy poisoning consists largely of species and individuals capable of only limited response to greater illumination. The more valuable mahoganies appeared tor example, to bei slower-growing than the less desireable economic species. It is concluded that the growth of a residual stand agter exploitation can be accelerated by appropriate silvicultural treatments.