Abstract
Soil temperature is an important factor within the climate system. Changes of trends in soil temperature and analysis of vulnerability due to heat stress can provide useful information on climate change. In this paper, the soil temperature regime was analyzed on seasonal and annual scales at depths of 2, 5, 10, 20, 30, and 50 cm at 26 sites in Croatia. Trends of maximal, mean, and minimal soil temperatures were analyzed in the periods 1961–2010 and 1981–2010. Duration of extreme soil temperatures and vulnerability due to high or low soil temperatures in the recent standard period 1981–2010 was compared with the reference climate period 1961–1990. The results show a general warming in all seasons and depths for maximal and mean temperatures in both observed periods, while only at some locations for minimal soil temperature. Warming is more pronounced in the eastern and coastal parts of Croatia in the surface layers, especially in the spring and summer season in the second period. Significant trends of maximal, minimal, and mean soil temperature in both observed periods range from 2.3 to 6.6 °C/decade, from −1.0 to 1.3 °C/decade, and from 0.1 to 2.5 °C/decade, respectively. The highest vulnerability due to heat stress at 35 °C is noted in the upper soil layers of the coastal area in both observed periods. The mountainous and northwestern parts of Croatia at surface soil layers are the most vulnerable due to low soil temperature below 0 °C. Vulnerability due to high or low soil temperature decreases with depth.
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This research has been carried out as part of the project COST Action ES1106 “Assessment of EUROpean AGRIculture WATer use and trade under climate change” (EURO-AGRIWAT).
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Sviličić, P., Vučetić, V., Filić, S. et al. Soil temperature regime and vulnerability due to extreme soil temperatures in Croatia. Theor Appl Climatol 126, 247–263 (2016). https://doi.org/10.1007/s00704-015-1558-z
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DOI: https://doi.org/10.1007/s00704-015-1558-z