DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 5-6/2023 str. 34 <-- 34 --> PDF |
predominantly lower compared to the other two plots during the summer season. The two-month-long monitoring during summer within survey plots showed that the variability of seasonal dynamics of the soil respiration usually depends on the changes in soil temperature and moisture (Figure 5). Within the Plot 1 and Plot 2, the most important environmental driver which affected the CO2 flux was soil water content. High positive correlation was found for the CO2 flux with soil moisture (r = 0.85, p < 0.05) within the second plot, while moderate correlation was observed within the first plot (r = 0.55, p < 0.05). At the same time, low correlation was revealed with the soil temperature within both plots. Considering the third plot, reliable positive correlation was observed with the soil temperature (r = 0.77, p < 0.05), while no correlation was found among the CO2 flux and the soil moisture (r = 0.05). During the survey season, the average emission of CO2 within the control plot (Plot 1) was increasing until the last decade of July. The CO2 flux reached the maximum value at the same time when the greatest value of soil water content was recorded, then the emission of CO2 began to decrease gradually until the end of the summer season. Similar dynamic of CO2 flux was observed within the second plot (Plot 2), but changes of soil moisture more significantly affected the emission compared to the control plot. The slight decline of the CO2 emission at the beginning of the season was followed with the decrease of soil water content. From the last decade of June, the values of flux were increasing and have reached the maximum on the 22nd of July. Due to the increase of the soil temperature that caused the reduction of soil water content, a rapid drop of CO2 emission happened. It reached to the minimum value (5.22 g CO2 m-2 day-1) at the end of the observation period. Within the both plots (Plot 1 and Plot 2), the CO2 flux had different values when soil water content was low (about 5%). In that case, the increased soil temperature caused the greater emission. The most significant factor within the third plot (Plot 3) affecting the CO2 flux was the soil temperature. The greatest values of the flux were recorded in the middle of July and during the first decade of August when the soil temperature was over 30 oC. All decreases of |