DIGITALNA ARHIVA ŠUMARSKOG LISTA
prilagođeno pretraživanje po punom tekstu



ŠUMARSKI LIST 11-12/2023 str. 41     <-- 41 -->        PDF

5.0 image analysis software (Systat Software, Inc., San Jose, CA, USA).
Mean values and differences between the species’ needle morphology were examined using the Cluster Analysis (Nearest Neighbor Method, Squared Euclidean Distance, Figure 2), while differences between parks and exposures were examined by ANOVA and LSD test at 95% level, using Statgraphics Centurion XVI, Version 16.1.11., (USA) statistical program (Figures 3 and 4; Table 2; Table 3). Correlations between the four measured needle traits of nine conifer species were determined by linear regression analyses (presented as text in Results section).
RESULTS
REZULTATI
Geographic and geologic characteristics of the study parks were presented in Table 1. For TP park slight air pollution was found. AC and BB parks had moderate, but MM, PS and PP parks excessive air pollution (according to distance from trafic). Geologic substrata also differ between parks, but pedologic substrata were almost same (limestones), with the exception of BB park (serpentinite).
Mean values of four morphological needle traits (length, width, area and perimeter) influenced by the crown exposure of all nine investigated species were presented in Tables 2,3 and 4 and Figures 2,3 and 4. The mean values of all quoted morphological traits were almost published before (Nikolić et al. 2019) (all histograms which were marked as “Mean” in Figures 3 and 4, and in Table 2).
Pinus nigra possessed the highest needle trait values (Table 2, Figure 2). Abies concolor, Taxus baccata and Abies alba also had larger needles in comparison to other investigated conifers.
Strong positive linear correlations were found between length and perimeter (r = 0.94 – 1.00), length and area (r = 0.82 – 0.96), and area and perimeter (r = 0.84 – 0.97) (results were not presented). Predominantly weak positive correlations were found between width and area (r = 0.10 – 0.80). Negative correlations between width and length and width and perimeter (r = -0.37 and r = -0.29, resp.) were found for C. atlantica. There were strong positive correlations (r > 0.75) between almost all four traits of P. pungens.
Means for each analyzed park were presented in Table 2. Mean values for four main exposures (E, N, S, W) had been presented in Table 2 too, as well as for every of analyzed park (Figure 3 a-i and Figure 4 a-i). Statistical signification was presented in Table 3.
In Abies alba needles, the mean values of the four measured traits (length, width, area and perimeter) were presented (Table 2, Figure 3a, Figure 4a), with statistically approved differences between parks BB and PP for needle length