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Samburova, V.* ; Schneider, E.* ; Rüger, C.P.* ; Inouye, S.* ; Sion, B.* ; Axelrod, K.* ; Bahdanovich, P.* ; Friederici, L.* ; Raeofy, Y.* ; Berli, M.* ; Lutz, A.* ; Zimmermann, R. ; Moosmüller, H.*

Modification of soil Hydroscopic and chemical properties caused by four recent California, USA megafires.

Fire 6:186 (2023)
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While it is well known that wildfires can greatly contribute to soil water repellency by changing soil chemical composition, the mechanisms of these changes are still poorly understood. In the past decade, the number, size, and intensity of wildfires have greatly increased in the western USA. Recent megafires in California (i.e., the Dixie, Beckwourth Complex, Caldor, and Mosquito fires) provided us with an opportunity to characterize pre- and post-fire soils and to study the effects of fires on soil water repellency, soil organic constituents, and connections between the two. Water drop penetration time (WDPT) tests performed in the field showed a significant increase (from <1 s up to >600 s) in WDPT from pre- to post-fire soils. This increase in soil water repellency after fires was confirmed by increases in apparent contact angle (ACA) between 1.1 and 9 times from unburned to burned soils. The chemical characterization of burned soils with high resolution mass spectrometry showed the increased abundance of hydrophobic organics (e.g., PAH-like compounds and organic molecules with a low number of oxygen atoms) as well as the correlation of the average H/C ratio and aromaticity index (AI) with ACA. Most likely, these compounds contribute to post-fire soil water repellency that triggers hydrological effects such as landslides, flooding, and debris flows.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Apparent Contact Angle ; Goniometer ; High Resolution Mass Spectrometry ; Post-fire Soil ; Soil Organic Matter ; Soil Water Repellency ; Thermal Analysis ; Water Drop Penetration Time; Resolution Mass-spectrometry; Aerosol Light-absorption; Water Repellency; Organic-matter; Thermal-analysis; Contact-angle; Brown Carbon; Forest Soils; Molecular Evidence; Black Carbon
Sprache englisch
Veröffentlichungsjahr 2023
HGF-Berichtsjahr 2023
ISSN (print) / ISBN 2571-6255
e-ISSN 2571-6255
Zeitschrift Fire
Quellenangaben Band: 6, Heft: 5, Seiten: , Artikelnummer: 186 Supplement: ,
Verlag MDPI
Verlagsort St Alban-anlage 66, Ch-4052 Basel, Switzerland
Begutachtungsstatus Peer reviewed
Institut(e) Cooperation Group Comprehensive Molecular Analytics (CMA)
POF Topic(s) 30202 - Environmental Health
Forschungsfeld(er) Environmental Sciences
PSP-Element(e) G-504500-001
Förderungen German Research Foundation (DFG)
DFG
Horizon 2020 program for the EU FT-ICR MS project (European Network of Fourier-Transform Ion-Cyclotron-Resonance Mass Spectrometry Centers)
National Science Foundation
DOI 10.3390/fire6050186
WOS ID 001011284200001
Scopus ID 85160237291
Erfassungsdatum 2023-12-08
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