DIGITALNA ARHIVA ŠUMARSKOG LISTA
prilagođeno pretraživanje po punom tekstu



ŠUMARSKI LIST 11-12/2009 str. 35     <-- 35 -->        PDF

S.Andrašev, M. Bobinac, S. Orlović: DIAMETER STRUCTURE MODELS OF BLACK POPLAR SELECTED ... Šumarski list br. 11–12, CXXXIII (2009), 589-603


Plantation age affects the trend of parameters of the
diameter structure model. In the initial period of plantation
development (five years) there was a sharp increase
in the location parameter (a), after which its
trend changed depending on the clone. In the initial period,
the increase in the scale parameter (b) of theWei-
bull diameter structure model was lower and also the
differences between the clones were lower. The increase
in parameter “b” in the following period was
considerably greater in the majority of the clones, but
the clone S showed the trend of a very slow increase.


6-36


The differences between the study clones were the lowest
in the shape parameter (c).


Diagram 3 Changes in the mean values of the parameters of the Weibull diameter structure model depending on plantation age.


Grafikon 3. Promjena srednjih veličina parametara modela debljinske strukture po Weibull-u u zavisnosti od starosti nasada


4.2.3. Construction of the Weibull diameter structure model


Konstrukcija modela debljinske strukture po Weibull-ovoj distribuciji


Diagram 4 presents the models of diameter structu-Aiming at the objective assessment of similarities
res of the study clones per years.The Diagram shows and differences between the Weibull diameter structure
the changes in the shape of diameter structure with models of poplar clones, the non-parametric Kolmogoadvancing
age, as well as the differences between the rov-Smirnov test was applied at the plantation age of
clones. It can be concluded that some clones had simi-17 and 20 years (Table 9). The test results showed silar
models of diameter structure, especially in the pe-gnificant differences only between diameter structure
riod after the age of 12, which indicates the possibility models of the clone PE 19/66 and the clones S , NS ,


6-7 1-3
th


of their grouping in the definition of management pro-
S in the 17 year, and between the clone PE 19/66


6-36
th
6-7 1-3 6-36


cedures.
and clones S , NS , S and Pannonia in the 20
year.


Table 9 Value of |D| statistics by Kolmogorov-Smirnov test and the comparison of differences in the Weibull diameter


th th


structure models in the 17 and 20 year of poplar plantation age.


Tablica 9.Vrijednosti |D| statistike po testu Kolmogorov-Smirnova i usporedba razlika modela debljinskih struktura po
modelu Weibull-a u 17. i 20. godini starosti nasada istraživanih klonova topola.


Clone –Klon 20 years –20. godina
S
6-36
NS
1-3
NS
11-8
Pannonia PE 19/66 S
6-7
17 years
S
6-36
-0.2039
ns
0.28
ns
0.1454
ns
0.6623
**
0.18
ns
NS
1-3
0.1993
ns
-0.1925
ns
0.195
ns
0.5266
**
0.1941
ns
NS
11-8
0.2626
ns
0.1963
ns
-0.1718
ns
0.3923
ns
0.35
ns
17. godina Pannonia 0.1771
ns
0.24
ns
0.1529
ns
-0.5641
**
0.2641
ns
* * ns ns ***
PE 19/66 0.5758 0.4972 0.3131 0.4661 -0.7144
S
6-7
0.2525
ns
0.1988
ns
0.3939
ns
0.3875
ns
0.6869
***
-


nsnon significant– nije signifikantno;
*significant at the risk level of 0,05– signifikantno na razini rizika od 0,05;
**significant at the risk level of 0,01– signifikantno na razini rizika od 0,01;
***significant at the risk level of 0,001


–signifikantno na razini rizika od 0,001.