Despite its above-average precipitation, Slovenia is vulnerable to drought, especially in its sub-Mediterranean part. The frequency and intensity of droughts have been increasing in recent decades. Summer droughts, which occur during heat waves and cause rapid deterioration in plant health, pose an increased risk. In this thesis, the effects of summer drought on vegetation in Sub-Mediterranean Slovenia in 2017 and 2022 were examined. The Vegetation Condition Index and the Vegetation Health Index were calculated. The months of June, July and August 2017 and June, July and August 2022 were analysed. The extent and intensity of summer drought between the two studied years was compared. Additionally, the effects of drought on different land use types (arable land, orchards, grasslands and forests) were contrasted. In July and August, the drought in 2022 was more extensive and severe than the one in 2017. In contrast, the drought in June was more extensive and intense in 2017 than in 2022. Arable land and orchards were the most affected by drought, followed by grasslands and finally forests which were the least affected land use type.
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