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ŠUMARSKI LIST 9-10/2019 str. 13     <-- 13 -->        PDF

problems resulted in incomplete series (20% of data missing). In cases where data were missing for all replicates at one site and hour, that time was eliminated for all other sites. This prevented a hot or cold spell from biasing one site while another had missing data (Potter et al. 2001).
The microclimate study was conducted in the period from January 2012 to December 2014, with measurements performed one day per week at hourly intervals, always on the same day of the week. Precipitation was measured using an automatic rain gauge over the entire period and values are presented as the total monthly value. Potential evapotranspiration (PET) was calculated using the Blaney and Criddle method (Šimunić 2016). The dry season water deficit (DSWD) is expressed in mm and can be calculated as DSWD = p – PET, where p is the amount of monthly rainfall (mm) and PET (mm) is the monthly potential evapotranspiration (Dufour – Dror and Ertas 2004). The dry season water deficit (mm), potential evapotranspiration (mm), and precipitation were calculated on a monthly level.
Ranges were calculated as differences between the maximum and minimum values. The measured microclimatic elements are expressed as average weekly values. The main effects of the differences and ranges of microclimatic elements among type of forest stands (experimental plots) were determined using Repeated measures ANOVA. We used the following factors: forest type/degradation stage × season. There were 4 types of forest stand/degradation stage (garrigue, maquis, Holm oak forest, Aleppo pine with Holm oak forest) and 4 seasons (spring, summer, autumn, winter). Levene’s test for homogeneity of variances was not significant. The mean comparison test (Fisher’s least significant difference (LSD), α = 5% tolerance level) was used to test climate element differences between stands. All data were processed using the HW3, SpecWare 9.0 and Statistica 7.1 software packages (StatSoft 2003).
The absolute maximum air temperature (40.1 °C), soil temperature (28.9 °C), and volumetric soil moisture (82.8%) were measured in the garrigue degradation stage. The absolute maximum value of relative air humidity (100%) was measured in the maquis and Holm oak forest with myrtle. In all stand types, the absolute minimum volumetric soil moisture was 0%. The highest amount of potential evapotranspiration was in the garrigue degradation stage (139.48 mm), and the lowest was in the maquis (46.85 mm). The absolute highest water deficit was also in the garrigue (-129.61 mm), and the lowest was in the Holm oak forest (-124.95 mm). The highest absolute annual range of