Abstract
Abstract In investigating aridity in Vojvodina (a region in the northern part of Serbia), the Forestry Aridity Index (FAI) was used. This index was chosen due to being one of the most suitable indices for the analysis of the interaction of climate and vegetative processes, especially in forestry. The spatial distribution of the FAI for annual and decennial periods, as well as its annual trend, is analysed. Satisfactory compatibility between the low (forest) and high (steppe) FAI values with the forest and steppe vegetation on the Vojvodina terrains was obtained. The calculated values of the FAI showed that there was no particular annual trend. These results correspond to the earlier calculated values of the De Martonne aridity index and the Pinna combinative index. Therefore, it can be concluded that there were no recent changes in aridity during the observed period. Results of the correlation indicate weak linearity between the FAI, and the North Atlantic Oscillation and El-Niño South Oscillation.
Highlights
In recent decades, the issues of climate variability and climate change have been at the center of many scientific studies
The lowest values of Forestry Aridity Index (FAI), from 6.95 to 7.25, were found in the southeast Vojvodina region, while in the rest of the region values were higher than 7.25. This means that, according to FAI values, a sessile oak / Turkey oak climate is present in the southeast part of Vojvodina
These results correspond to the values of Pinna combinative index and De Martonne index, characterized by humid climate, according to De Martonne climate classification
Summary
The issues of climate variability and climate change have been at the center of many scientific studies. The first index can be calculated for different time scales, such as years, seasons and months, while the second of them is calculated only for years Both aridity indices are used worldwide in order to identify the dry/humid climate conditions of different regions e.g. The calculation of the FAI takes into account the ratio of the average temperature of the critical months (July to August), the precipitation sums in the main growth cycle of the forest (May to July), and the precipitation sums in the critical months (from July to August) This index can be classified as vegetative because the FAI climatic categories are defined according to the types of forest and steppe vegetation.
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