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ŠUMARSKI LIST 9-10/2011 str. 26     <-- 26 -->        PDF

V. Račko, M. Saniga, I. Čunderlík: THE IMPACT OF SILVICULTURALTREATMENTS ON THE STRUCTURE ...Šumarski list br. 9–10, CXXXV (2011), 437-448
The diameter of samples and the width of the DZage (CA) of the trunk were counted.The ratio of DZ to
and RH were measured.At the same time, the age ofRH was calculated as ratio of DZ width or RH and diathe
tree at DBH and at other heights and the cambialmeter of the trunk as a percentage.


RESULTS – Resultati
The analysis of theTable 1 and Table 2 points outtrees, obtained from the CMT 513, have,at partially
that the DBH structure of tree samples for a differentdifferent age,higher parameters of the DBH and volusilviculture
technology is different. In case of the CMTmes of the down third of a trunk. Higher parameters of
513, the DBH are statistically significantly bigger thanquantitative production are the result of a considerably
CMT514 b. In CMT513, where trees of an upper levelhigher capacity of assimilation apparatus of a crown.
are autonomous in growth during practically whole ob-The analysis of production parameters of beech samservation
time, creates assumptions of more intensiveples confirmed, despite their partially different age,that
diameter growth. Moreover, it is necessary to add toselection structure of a stand creates significantly good
this fact partially the factor of age, whereas observedqualitative assumptions for its quantitative and value
samples are approximately 10 years older.The sampleproduction.


Table 2T-tests of mean values of tree characteristics for investigated CMTs.


Tablica 2.T-test srednjih vrijednosti značajki stabala istraživanih sastojina (CMTs)


CMTTree agep-valueDBHp-valueCrown lengthp-value
OdjeliDob stabalap vrijednostPrsni promjerp vrijednostDuljina krošnjep vrijednost
513109.7±1.5847.9±3.6317.1±4.15
0.0001***0.0494*0.5846ns
514b97.7±3.5143.8±5.3818.3±3.18


Meanvalues(within the same column mean ± standard deviation (SD)) werecalculatedbased onmeasurementstakenin december
2009. Student´st-test(p-value – level of statistical significance, *p < 0.05, **p < 0.01, ***p < 0.001, ns - not statistically
significant, p > 0.05).


Srednje vrijednosti (u istoj koloni dane su srednje vrijednosti i standardna devijacija) temeljem mjerenja iz prosinca 2009.
godine. Student-ov t-test (p-vrijednost – stupanj statistički značajne razlike – ns nije statistički značeno).


3


Table 3Comparisonof crownvolumes C(m) developmentduring the last23 yearsfor investigated CMTs


Tablica 3.Usporedba volumena krošanja Ck
k
(m3) tijekom 23 godine motrenja na istraživanim plohama CMTs


CMT
Odjeli
19861991199720012009
C
k
p-value
p
vrijednost
C
k
p-value
p
vrijednost
C
k
p-value
p
vrijednost
C
k
p-value
p
vrijednost
C
k
p-value
p
vrijednost
513
514b
297±133
175± 69
0.0432*
391±156
197± 74
0.0328*
582±234
357±188
0.0087**
624±266
386±145
0.0432*
727±401
723±353
0.9812ns


Within the same column (mean ± SD).Student´s t-test(p-value – level of statistical significance, *p < 0.05, **p < 0.01,
***p < 0.001, ns (not statistically significant, p > 0.05).


U istoj koloni dane su srednje vrijednosti i standardna devijacija. Student-ov t-test (p-vrijednost – stupanj statistički značajne


razlike – ns nije statistički značeno).


The average crown volumes forindividualCMTs
duringthe past23 yearssignificantly differed, withthe
exception ofthe lastgrowthperiod2001–2009.The average
crown volumes (in theyears1986–2001)inthe
CMT513was about 23–35% higher,thanin theCMT
514b (Table 3).


The analysis of correlation strength between tree
samples DBH and their height for the whole period of
observation (23years) is characterized in the Fig. 3a, 3b.


While we are assessing this dependency on CMT513
(Fig. 3a), determination coefficient has a significantly
higher value, i. e. in case of growth relations between
the diameter and the height of sample trees there is a
stronger dependency.


The analysis of the relationship between the volume
of a crown and the DBH of beech sample trees is interesting.
In case of the sample trees from the CMT513 the
determination coefficient is significantly lower than for
sample trees from the CMT514b, which were cultivated
by crown thinning with a positive selection (Fig. 4a, 4b).


The mentioned fact confirmed that beech sample
trees in the stand cultivated by crown (increment) thinning
with the support of crop trees take up to 68% impact
on diameter growth of a trunk. On the other hand,
crown of beech sample trees which are in the upper layer
of selection forest in a autonomous position for a long


2


time have determination coefficient R= 0.453, i. e. the


capacity of a crown takes only 45% impact on a diame