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ŠUMARSKI LIST 9-10/2005 str. 15     <-- 15 -->        PDF

J. Zelić: PRILOG ISTRAŽIVANJU METODE PROREDE JEDNODOBNIH BUKOVIH SASTOJINA Šumarski list br. 9–10, CXXIX (2005), 463-473
On plot 1, there are 346 trees with volume of 452,98 m3/ha, while on plot 2
there are 408 trees with volume of 444,72 m3/ha.


The research goal was to found an optimal method of beech stands thinning.


The forest practice still does not aplly normal distributions of breast
height diameters.The article recommends Beta-distribution as a good model
of “normal distributions“.


The measured data confirms the plot 1 was more intensively managed in
the past than plot 2, but both plots were managed with expertise which proves
the distribution of breast hight diameter, characteristic for regular stands.


Disrtibution of breast height diameters and volume per degrees of thickness
are shown in Table 1.


According to earlier mamagement type of regular stands, the curve of distribution
of breast height diameters is bell-shaped.


The distributions of diameter of breast heights and volume per hectare are
esential parameters of forest menagement.


Beta-functions were used to equal the distributions of breast height diamaters.


F (d) = 0, 007495 .(d - 10) 1,00771 * (65 - d) 1,63964 = 346, for plot 1,


F (d) = 0, 002737 .(d - 10) 0,91156 * (65 - d) 2,06635 = 408, for plot 2.


Concrete and equal distributions were shown on Graphs 1 and 2.


The biometrical parameters, as amount of variation of breast height diameters
(arithmetical mean, median, first and second parameters od beta-distributionn,
asymmetry and flatness coeficient) show how the real distribution of
breast height diameters are asymetrical on the left (positive) side (Tables 2, 3).


Felling thinning volume was calculeted using Matić ’ (1985) method
(Em = M/n) and distibuted according the thickness degrees, that show positive
difference of trees numbers and volumes between the concrete and beta-distribution
(Tables 5, 6, 7).


Ater such distribution of felling volume per thickness degress, the concrete
distributions show “more normal“ shape (Graphs 3, 4).


Key words: method of thinning of regular forest, concrete and beta-distribution
of breast diameters, biometrical parameters, felling thinning volume,
distribution of felling volume per breast heigh diamater.