20.500.12556/DKUM-86980-fb9cf040-88b7-b53f-8947-5d9037ac4b49 δ13C as a tool to determine the origin of soil organic carbon Case study of a restored sloping orchard The effect of drip irrigation on the origin and size fraction of soil organic carbon was studied in the soils of an apple orchard (Malus domestica Borkh.) on hilly (20%) terrain in northeastern Slovenia in three slope positions (upslope, midslope and downslope), comparing irrigated with non-irrigated soils. Physical fractionation of soil organic carbon was performed on three soil layers (0–0.05, 0.05–0.15 and 0.15–0.30 m) in three size fractions: fraction A (> 0.0002 m), fraction B (0.0002‒0.00005 m) and fraction C (< 0.00005 m). Fraction A was the richest in soil organic carbon (7.7%), but fraction C was the dominant fraction in the total soil volume (86‒92%), making it the largest source of soil organic carbon (73%). The δ13C signature was performed to determine the existence of two different types (origins) of soil organic carbon: fresh and sedimentary. Fresh organic carbon dominates in the A fraction, while sedimentary organic carbon dominates in the C fraction and may contribute to higher structural stability, besides higher carbonates in the finest fraction. Irrigation mainly contributes to the higher stock of soil organic carbon (predominantly fresh and less sedimentary) in the coarse A fraction (21.14 t/ha in irrigated and 14.17 t/ha in non-irrigated soils). CaCO3 carbon isotopes drip irrigation physical fractionation soil organic matter ogljikovi izotopi kapljično namakanje fizikalna frakcionacija organske snovi v tleh true false true Institute of Agricultural Economics and Information Angleški jezik Slovenski jezik Znanstveno delo 2024-02-02 13:41:37 2024-02-02 13:54:03 2024-02-07 11:47:34 0000-00-00 00:00:00 2023 0 0 Str. 81-88 Št. 2 Letn. 18 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2022-07-13 2023-01-20 2023-02-22 631.4 152677891 10.17221/101/2022-SWR 1801-5395 Mursec-2023-δ13C_as_a_tool_to_determine_the_or.pdf Mursec-2023-δ13C_as_a_tool_to_determine_the_or.pdf 1 85657E3B69D77C2AA865426EFB172151 b0fead6dab49cf4663e69cd23dffb27ed40846beb3af5fea9bd5bf5669b95c3a f41e291d-c1c9-11ee-b96a-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=175885 https://doi.org/10.17221/101/2022-SWR 0 031e86dc-c1ca-11ee-b96a-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=175886 Fakulteta za kmetijstvo in biosistemske vede 0 0 0