Roles of transpiration, forest bioproductivity and fire on a long-term dripwater hydrochemistry dataset from Golgotha Cave, SW Australia

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dc.contributor.authorTreble, PCen_AU
dc.contributor.authorBaker, AAen_AU
dc.contributor.authorFairchild, IJen_AU
dc.contributor.authorBradley, Cen_AU
dc.contributor.authorMahmud, Ken_AU
dc.contributor.authorAndersen, MSen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorMariethoz, Gen_AU
dc.date.accessioned2023-01-13T02:26:33Zen_AU
dc.date.available2023-01-13T02:26:33Zen_AU
dc.date.issued2015-12-15en_AU
dc.date.statistics2022-11-10en_AU
dc.description.abstractGolgotha Cave is located in a forested catchment in SW Australia where evapotranspiration losses from the vadose-zone are high and forest biomass has been disturbed by fire. The cave has been continuously monitored since 2005 and this extensive dataset has been used to quantify key processes determining dripwater hydrology and chemistry (Mahmud et al., 2015; Treble et al., 2013; 2015). In this paper we present a synthesis of these findings and derive a conceptual model to illustrate the main hydrochemical processes that will impact cave dripwater in similar environments. We applied mass-balance techniques to quantify sources (water/rock interactions and aerosol) and sinks (prior calcite precipitation and biomass uptake). Mass-balance results suggest that transpiration and elemental sequestration into biomass modifies dripwater ion concentrations. The vegetation uptake impacts dripwater Mg, K and SO4, with the largest impact on SO4, estimated to be up to 60% at some drip sites. Overall, our findings suggest that varying amounts of transpiration by deeply-rooted trees contribute significantly to spatial and temporal variability in dripwater solute concentrations. This is in addition to the partitioning of infiltrating water between characteristic flow pathways. Applying principal components analysis, we identify a common long-term rising trend in dripwater Cl, Mg, K, Ca, Sr and Si. We assess whether the long-term trends in dripwater solutes are driven by post-fire biomass recovery and/or the impacts of a drying climate in SW Australia. References Mahmud et al. (2015), Terrestrial Lidar Survey and Morphological Analysis to Identify Infiltration Properties in the Tamala Limestone, Western Australia, doi:10.1109/JSTARS.2015.2451088. Treble et al. (2013), An isotopic and modelling study of flow paths and storage in Quaternary calcarenite, doi:10.1016/J.Quascirev.2012.12.015. Treble et al. (2015), Impacts of cave air ventilation and in-cave prior calcite precipitation on Golgotha Cave dripwater chemistry, doi:10.1016/J.Quascirev.2015.06.001.en_AU
dc.identifier.articlenumberPP23C-2320en_AU
dc.identifier.booktitleAGU Fall Meeting Abstractsen_AU
dc.identifier.citationTreble, P. C., Baker, A., Fairchild, I. J., Bradley, C., Mahmud, K., Andersen, M. S., Meredith, K. T. & Mariethoz, G. (2015). Roles of transpiration, forest bioproductivity and fire on a long-term dripwater hydrochemistry dataset from Golgotha Cave, SW Australia. Poster presented at the American Geophysical Union, Fall Meeting 2015, San Francisco, CA, USA, 14-18 December 2015. In AGU Fall Meeting Abstracts, Vol. 2015, (pp. PP23C-2320). Retrieved from: https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/71156en_AU
dc.identifier.conferenceenddate18 December 2015en_AU
dc.identifier.conferencenameAmerican Geophysical Union, Fall Meeting 2015en_AU
dc.identifier.conferenceplaceSan Francisco, Californiaen_AU
dc.identifier.conferencestartdate14 December 2015en_AU
dc.identifier.otherPP23C-2320en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/71156en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14345en_AU
dc.identifier.volume2015en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.subjectTranspirationen_AU
dc.subjectForestsen_AU
dc.subjectCavesen_AU
dc.subjectFiresen_AU
dc.subjectWateren_AU
dc.subjectAustraliaen_AU
dc.titleRoles of transpiration, forest bioproductivity and fire on a long-term dripwater hydrochemistry dataset from Golgotha Cave, SW Australiaen_AU
dc.typeConference Posteren_AU
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