20.500.12556/DiRROS-28667 Isotopic composition of precipitation and its role in forest hydrology under climate change: insights from Slovenian lowland forests Monitoring of stable isotopes in throughfall (δ18O, δ2H) and meteorological parameters is a valuable tool for researching forest hydrology, particularly during extreme events like droughts and floods. This study presents the first systematic analysis of air temperature and precipitation changes over the past 65 years in two Slovenian lowland forests: Murska šuma and Krakovski gozd, in combination with isotopic composition research of throughfall. The observed rising air temperatures and altered precipitation patterns are reflected in the isotopic composition of throughfall. Over the last 65 years, air temperature has increased by approximately 2.5 °C. Although total annual precipitation amounts have remained relatively stable, in the last 35 years there is a notable decrease in precipitation in growing season and an increase during the dormant season, influenced by air masses of Mediterranean origin. Extreme drought in 2022 and flood in 2023 are confirmed by the Standardized Precipitation Index and isotopic variations in throughfall due to fractionation processes. Annual variability appears as seasonal changes, with sine-curve amplitudes of 3.71‰ in Krakovski gozd and 3.61‰ in Murska šuma. Together with the Local Meteoric Water Lines, these patterns support estimates of groundwater mean residence time and the origin of water used by trees. stable isotopes oxygen hydrogen climate change hydrology forest throughfall Standardized Precipitation Index stabilni izotopi kisik vodik podnebne spremembe hidrologija gozda prepuščene padavine standardiziran padavinski indeks true false true MDPI Angleški jezik Slovenski jezik Neznano 2026-03-27 11:08:06 2026-03-27 11:08:06 2026-03-30 12:28:16 0000-00-00 00:00:00 2026 0 0 Soavtorji: Mitja Janža, Matjaž Čater, Barbara Čenčur Curk, Polona Vreča; 22 str. no. 6, [article no.] 760 vol. 18 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 556.3 2073-4441 10.3390/w18060760 272790787 water-18-00760.pdf water-18-00760.pdf 1 B618E234F6C8E2C56310965EE7E51312 b82ab6903f06292a01d1b95284b49578e2b75cb36e2af24c03ee5f461937d2a7 668fe47c-29c5-11f1-8a61-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=42605 https://www.mdpi.com/2073-4441/18/6/760 0 1df9b553-2c23-11f1-bbb2-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=42698 Gozdarski inštitut Slovenije Geološki zavod Slovenije 0 0 0