DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 1-2/2016 str. 12     <-- 12 -->        PDF

assessed for all trees on plots according to ICP Forest methodology (Eichhorn 2010; Potočić & Seletković 2011).
Fungal diversity was evaluated using Shannon diversity index (H) (Heip et al. 1998; Molles 1999; Martín-Pinto et al. 2006), defined as:
                (H) = –
where Pi stands as a proportion (n/N) of individuals in a single species (n), divided by the total number (N) of individuals in the sample, while S represents the total number of recorded species (species richness) at the plot.
Shannon index was calculated with PAST 3.06 software (Paleontological Statistics, Natural History Museum, University of Oslo, Norway), based on the total number of species (H) and number of ectomycorrhizal species (H’) separately for every plot. Species richness (S) and Shannon index (H) were used as independent variables, while the number of S. sapinea pycnidia and crown transparency were used as dependent variables to calculate linear regression and correlation analyzes to compare the values between the plots. All analyzes were performed with Statistica 10 software (StatSoft, Inc., Tulsa, OK, USA). To test statistical significance, in all analyzes a 95% confidence level was used (p < 0.05). Statistical results were interpreted according to Horvat & Ivezić (2005).
Results
Rezultati
Results from data obtained on nine plots during 2013 showed different species richness, crown transparency and diversity index distribution. In total, 3377 sporocarps were recorded, belonging to 124 fungal species and 48 genera, with 51 ectomycorrhizal (ECM) species. Plot Trošti was the most rich in fungi species (35), and was followed by plots Trstenik (34) and Lesišćina (33) (Table 2). At plots Lovranska Draga and Paz richness accounted for only 15 species. The highest number of ECM species was recorded on plots Lesišćina (22), and Previž (19), while the plot Lovranska Draga was the most poor in ECM species (5). The highest value of Shannon index (H) was recorded on plot Trstenik (3.04), while the lowest one was at plot Previž (1.38) (Table 2). For ECM species, the highest value of Shannon index (H’) was at plot Lesišćina (2.14), while the lowest one was at plot Kurbino brdo (0.60). Sphaeropsis sapinea pycnidia were not found at plots Previž and Lesišćina, while they were abundant at plots Trošti, Kurbino brdo and Mali Golji. On analyzed needles, together with S. sapinea, Truncatella hartigii (Tubeuf) Steyaert was present. Plot Trošti was the most infected by S. sapinea with an average number of 24.46 pycnidia/needle (Table 2), and had the highest average crown transparency (44.17%), while the lowest one was recorded on plot Lesišćina (6.86%) (Table 2).
According to the linear regression model, there is an indication of weak positive correlation (r = 0.273), between species richness and an average number of S. sapinea pycnidia, but it is not statistically significant (p = 0.477) (Figure 1).