DOI: 10.5194/hess-20-2745-2016
Scopus记录号: 2-s2.0-84975852894
论文题名: A post-wildfire response in cave dripwater chemistry
作者: Nagra G ; , Treble P ; C ; , Andersen M ; S ; , Fairchild I ; J ; , Coleborn K ; , Baker A
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 7 起始页码: 2745
结束页码: 2758
语种: 英语
Scopus关键词: Calcium
; Caves
; Forestry
; Groundwater
; Vegetation
; Evaporative concentration
; Forward modeling
; Isotopic composition
; Regional groundwater
; Solute concentrations
; Southwest australia
; Surface disturbances
; Vegetation dynamics
; Fires
; albedo
; cave
; concentration (composition)
; evaporation
; forest canopy
; hydrochemistry
; isotopic composition
; speleothem
; stalagmite
; vegetation dynamics
; water use
; wildfire
; Australia
; South Australia
英文摘要: Surface disturbances above a cave have the potential to impact cave dripwater discharge, isotopic composition and solute concentrations, which may subsequently be recorded in the stalagmites forming from these dripwaters. One such disturbance is wildfire; however, the effects of wildfire on cave chemistry and hydrology remains poorly understood. Using dripwater data monitored at two sites in a shallow cave, beneath a forest, in southwest Australia, we provide one of the first cave monitoring studies conducted in a post-fire regime, which seeks to identify the effects of wildfire and post-fire vegetation dynamics on dripwater δ18O composition and solute concentrations. We compare our post-wildfire δ18O data with predicted dripwater δ18O using a forward model based on measured hydro-climatic influences alone. This helps to delineate hydro-climatic and fire-related influences on δ18O. Further we also compare our data with both data from Golgotha Cave – which is in a similar environment but was not influenced by this particular fire – as well as regional groundwater chemistry, in an attempt to determine the extent to which wildfire affects dripwater chemistry. We find in our forested shallow cave that δ18O is higher after the fire relative to modelled δ18O. We attribute this to increased evaporation due to reduced albedo and canopy cover. The solute response post-fire varied between the two drip sites: at Site 1a, which had a large tree above it that was lost in the fire, we see a response reflecting both a reduction in tree water use and a removal of nutrients (Cl, Mg, Sr, and Ca) from the surface and subsurface. Solutes such as SO4 and K maintain high concentrations, due to the abundance of above-ground ash. At Site 2a, which was covered by lower–middle storey vegetation, we see a solute response reflecting evaporative concentration of all studied ions (Cl, Ca, Mg, Sr, SO4, and K) similar to the trend in δ18O for this drip site. We open a new avenue for speleothem science in fire-prone regions, focusing on the geochemical records of speleothems as potential palaeo-fire archives. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78782
Appears in Collections: 气候变化事实与影响
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作者单位: Connected Waters Initiative Research Centre, University of New South Wales, Sydney, NSW, Australia; Institute for Environmental Research, Australian Nuclear Science and Technological Organisation, Lucas Heights, NSW, Australia; School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom
Recommended Citation:
Nagra G,, Treble P,C,et al. A post-wildfire response in cave dripwater chemistry[J]. Hydrology and Earth System Sciences,2016-01-01,20(7)