Hydrological and geochemical responses of fire in a shallow cave system

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dc.contributor.authorBian, Fen_AU
dc.contributor.authorColeborn, Ken_AU
dc.contributor.authorFlemons, Ien_AU
dc.contributor.authorBaker, AAen_AU
dc.contributor.authorTreble, PCen_AU
dc.contributor.authorHughes, CEen_AU
dc.contributor.authorBaker, ACen_AU
dc.contributor.authorAndersen, MSen_AU
dc.contributor.authorTozer, MGen_AU
dc.contributor.authorDuan, WHen_AU
dc.contributor.authorFogwill, CJen_AU
dc.contributor.authorFairchild, IJen_AU
dc.date.accessioned2021-03-08T03:42:43Zen_AU
dc.date.available2021-03-08T03:42:43Zen_AU
dc.date.issued2019-04-20en_AU
dc.date.statistics2021-03-05en_AU
dc.description.abstractThe influence of wildfire on surface soil and hydrology has been widely investigated, while its impact on the karst vadose zone is still poorly understood. A moderate to severe experimental fire was conducted on a plot (10 m × 10 m) above the shallow Wildman's Cave at Wombeyan Caves, New South Wales, Australia in May 2016. Continuous sampling of water stable isotopes, inorganic geochemistry and drip rates were conducted from Dec 2014 to May 2017. After the fire, drip discharge patterns were significantly altered, which is interpreted as the result of increased preferential flows and decreased diffuse flows in the soil. Post-fire drip water δ18O decreased by 6.3‰ in the first month relative to the average pre-fire isotopic composition. Post-fire monitoring showed an increase in drip water δ18O in the following six months. Bedrock related solutes (calcium, magnesium, strontium) decreased rapidly after the fire due to reduced limestone dissolution time and potentially reduced soil CO2. Soil- and ash-derived solutes (boron, lead, potassium, sodium, silicon, iodine and iron) all decreased after the fire due to volatilisation at high temperatures, except for SO42−. This is the first study to understand the hydrological impact from severe fires conducted on a karst system. It provides new insights on the cave recharge process, with a potential explanation for the decreased d18O in speleothem-based fire study, and also utilise the decreased bedrock solutes to assess the wildfire impacts both in short and long time scales. Open access © 2021 Elsevier B.Ven_AU
dc.description.sponsorshipKarst Fire Hydrograph analysis Groundwateren_AU
dc.identifier.citationBian, F., Coleborn, K., Flemons, I., Baker, A., Treble, P. C., Hughes, C. E., Baker, A., Andersen, M. S., Tozer, M. G., Duan, W., Fogwill, C. J., & Fairchild, I. J. (2019). Hydrological and geochemical responses of fire in a shallow cave system. Science of The Total Environment, 662, 180-191. doi:10.1016/j.scitotenv.2019.01.102en_AU
dc.identifier.issn0048-9697en_AU
dc.identifier.journaltitleScience of The Total Environmenten_AU
dc.identifier.pagination180-191en_AU
dc.identifier.urihttps://doi.org/10.1016/j.scitotenv.2019.01.102en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10494en_AU
dc.identifier.volume662en_AU
dc.language.isoenen_AU
dc.subjectCavesen_AU
dc.subjectFiresen_AU
dc.subjectNew South Walesen_AU
dc.subjectGround wateren_AU
dc.subjectStable isotopesen_AU
dc.subjectTemperature range 0400-1000 Ken_AU
dc.subjectSoilsen_AU
dc.subjectSoil chemistryen_AU
dc.titleHydrological and geochemical responses of fire in a shallow cave systemen_AU
dc.typeJournal Articleen_AU
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