Das Wachstum von Pinus pinaster (Aiton) in Abhängigkeit vom Standraum |
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Authors: | A. van Laar |
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Affiliation: | (1) Faculty of Forestry, University of Stellenbosch, Rep. of South Africa |
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Abstract: | Summary Spacing trials were established inPinus pinaster, in plantations in the Southern and South-Western Cape Province in South Africa. Eight spacings, with nominal initial stem numbers between 125 and 3000 were tested in each of the two trials, with a single replicate in each experiment. The Chapman-Richards growth model was applied to mean diameter, mean height and basal area/ha. For diameter and height, the assumption m=0 holds true, but for basal area/ha, this parameter is related to initial stem number. The volume growth of each sample plot was estimated from equations with basal area and mean height and their interaction as predictor-variables. The regression model also included constraints for basal area and height, to prevent anomalies for the estimated volume per hectare at young age. Each of the trials contained a number of plots, thinned after the onset of competition. The growth rates in these plots was statistically significantly greater than that of the same stand density in the unthinned plots. |
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