20.500.12556/RUL-180298 Thin technosols mature to agronomically functional soils on a reclaimed ash landfill The long-term functionality of thin (≤ 30 cm) technosols – anthropogenic soils constructed from homogenized transported soil over reclaimed lignite fly ash landfills – is evaluated here. This study investigates three distinct parcels (defined as contiguous land-use areas reclaimed with same initial substrate material in different phases) on a landfill in central Slovenia: P1 (28 years old), P2 (25 years old), and P3 (15 years old). Soil sampling was conducted during a single campaign in 2024 to assess pedogenic stabilization. All parcels demonstrated plantavailable water (PAW) above the 20% vol. agronomic threshold, with P1 reaching 26.1% vol. and P3 23.8% vol. Strong aggregate stability (>90% waterstable aggregates) was observed across the site. The oldest parcel (P1) exhibited the most favorable bulk density (~1.11 g cm-³), stable pH and uniform saturated hydraulic conductivity (Ks), while younger parcels showed localized compaction exceeding 1.50 g cm-³. Chemical analysis via pXRF confirmed that trace elements (e.g., Cr: 84–111 mg kg-¹, Ni: 45–57 mg kg-¹) remain within Slovenian regulatory limits. While topsoil nutrients are adequate (OM 5.5–6.0%), a sharp decline in the subsoil (OM ~2.1%) indicates limited vertical nutrient cycling. These findings prove that even a thin technosol can develop essential functions for agriculture, such as water retention and structural stability, within three decades. However, limited soil depth restricts drought resilience to approximately 7–10 days in younger covers versus 28 days in mature ones. anthropogenic soil land reclamation renaturation soil developtment soil functions soil quality technosol antropogena tla melioracija renaturacija razvoj tal funkcije tal kakovost tal true false true Angleški jezik Slovenski jezik Članek v reviji 2026-03-05 12:18:21 2026-03-05 12:18:30 2026-03-06 04:33:08 0000-00-00 00:00:00 2026 0 0 15 str. [article no.] 1727139 Vol. 6 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2026-03-05 631.4 2673-8619 10.3389/fsoil.2026.1727139 270599171 RAZ_Golob_Nejc_2026.pdf RAZ_Golob_Nejc_2026.pdf 1 BA3E92D7549D7BDBAF9B1E801230AAD4 4146bfca85a4147a4db87e4aa6f427c63cd48e9dda1762595fc615b089f5c2dd d1933119-1884-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=229520 Biotehniška fakulteta 0 0 0