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ŠUMARSKI LIST 11-12/2009 str. 34     <-- 34 -->        PDF

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


which points out the changes in diameter structure of the
study clones depending on the age.


With higher plantation ages, location parameter (a)
and scale parameter (b) also increased with small oscillations,
which was confirmed by the significance of the
correlation coefficient of 0.71 and 0.73 respectively
(Diagram 3).This was shown by the shift of the curve
of diameter structure model to the right, towards larger
diameters, and in a wider range of diameters at breast
height with a lower relative frequency of the modal degree
(Diagram 4).The changes in shape parameter (c)
were smaller, which was confirmed by the correlation
coefficient of 0.36 (Diagram 3). However, its significance
at the risk level of 0.001 indicates the increasing
trend with plantation age, i.e. the change in the shape of
diameter structure positive skewness, or approximately
normal distribution, to the negative skewness.


Table 7
Mean values of scale parameter (b) of theWeibull diameter structure model and the results of the analysis
of variance test and LSD test at the risk level of 0.05 of study clones per years of measurement.


Tablica 7.Srednje vrijednosti parametra skaliranja (b) modela Weibull-ove distribucije prsnih promjera i rezultati testa
analize varijance i testa NZR na razini rizika od 0,05 istraživanih klonova po godinama izmjere.


Clone
Klon
Plantation age after planting –Starost nasada nakon sadnje
1 year
1. god.
2 years
2. god.
5 years
5. god.
8 years
8. god.
12 years
12.god.
17 years
17. god.
20 years
20. god.
S6-36 1,37 (0.18)
1
c
2
1,96 (0.48) c 4,83 (0.61) bc 6,46 (0.53) c 5,93 (0.56) c 7,11 (0.18) c 7,64 (0.16) d
NS1.3 1,16 (0.27) c 1,87 (0.41) c 5,99 (1.74) ab 10,51 (1.76) a 14,87 (1.59) a 17,9 (0.96) a 22,22 (0.57) a
NS11-8 1,94 (0.08) b 3,89 (0.22) ab 7,38 (0.83) a 8,94 (0.88) b 11,88 (1.99) b 12,13 (2.97) b 13,27 (3.46) c
Pannonia 2,76 (0.24) a 4,42 (0.29) a 7,3 (0.59) a 6,33 (0.14) c 6,49 (1.36) c 11,43 (1.57) b 14,36 (1.96) c
PE19/66 1,46 (0.24) c 3,25 (0.57) b 3,59 (0.58) c 5,99 (1.11) c 6,81 (1.47) c 16,76 (2.09) a 22,04 (2.59) a
S6-7 2,5 (0.32) a 3,99 (0.59) a 3,42 (0.82) c 8,18 (0.61) b 11,41 (1.11) b 16,94 (1.04) a 18,34 (1.21) b
F 30.65*** 23.56*** 13.51*** 13.31*** 26.83*** 23.97*** 31.58***


1 Values in parentheses represent the standard deviation – Vrijednosti u zagradi predstavljaju standardnu devijaciju.


2 The same letters indicate that there is no statistically significant differences between the clones tested by least significant
differences at the risk level of 0.05 – Ista slova znače da ne postoje statistički značajne razlike između klonova po testu
najmanje značajne razlike na razini rizika od 0,05.


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


–signfikantno na razini rizika od 0,001.


Table 8
Mean values of shape parameter (c) of the Weibull diameter structure model and the results of the analysis of
variance test and LSD test at the risk level of 0.05 of study clones per years of measurement.


Tablica8.Srednje vrijednosti parametra oblika (c) modelaWeibull-ove distribucije prsnih promjera i rezultati testa analize
varijance i testa NZR na razini rizika od 0,05 istraživanih klonova po godinama izmjere.


Clone
Klon
Plantation age after planting –Starost nasada nakon sadnje
1 year
1. god.
2 years
2. god.
5 years
5. god.
8 years
8. god.
12 years
12.god.
17 years
17. god.
20 years
20. god.
S6-36 2,235(0.20)1 b2 2,044 (0.27) b3,714(0.59)abc 4,373 (1.37) a 2,971 (0.45) c 3,618 (0.86) b 3,519 (0.81) b
NS1.3 2,084 (0.57) b 2,513 (0.68) b 4,146(1.39) ab 4,963 (1.06) a 5,398 (1.09) a 5,131 (1.57) b 5,123(0.99) ab
NS11-8 3,099 (0.95) b 4,451 (1.03) a 4,831(1.16) ab 4,74 (1.56) a 4,415(1.18) ab 3,556 (0.80) b 3,493 (0.64) b
Pannonia 5,378 (1.90) a 5,133 (0.93) a 5,04 (0.98) a 4,077 (0.46) a 3,425(0.70) bc 5,539(1.44) ab 5,712(1.42) ab
PE19/66 2,95 (0.40) b 4,961 (0.58) a 3,53 (0.59) bc 3,372 (0.19) a 3,228(0.30) bc 5,618(0.70) ab 6,563 (1.07) a
S6-7 4,677 (1.00) a 4,175 (0.89) a 2,378 (0.79) c 4,949 (1.30) a 5,69 (1.46) a 7,986 (3.86) a 7,287 (3.09) a
F 7.12*** 11.23*** 4.08* 1.23ns 5.88** 2.98* 3.96*


1 Values in parentheses represent the standard deviation – Vrijednosti u zagradi predstavljaju standardnu devijaciju.


2 The same letters indicate that there is no statistically significant differences between the clones tested by least significant
differences at the risk level of 0.05 – Ista slova znače da ne postoje statistički značajne razlike između klonova po testu
najmanje značajne razlike na razini rizika od 0,05.


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.


The differences between the parameters of the Wei-gnificant difference test at the 5%risk level grouped
bull diameter structure model of poplar clones per the study clones in several groups.
years of measurement were significant, and the least si