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| Titel |
Biomass uptake and fire as controls on groundwater solute evolution on a southeast Australian granite: aboriginal land management hypothesis |
| VerfasserIn |
J. F. Dean, J. A. Webb, G. E. Jacobsen, R. Chisari, P. E. Dresel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 15 ; Nr. 11, no. 15 (2014-08-04), S.4099-4114 |
| Datensatznummer |
250117536
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| Publikation (Nr.) |
 copernicus.org/bg-11-4099-2014.pdf |
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| Zusammenfassung |
| The chemical composition of groundwater and surface water is often considered
to be dominated by water–rock interactions, particularly weathering;
however, it has been increasingly realised that plant uptake can deplete
groundwater and surface water of nutrient elements. Here we show, using
geochemical mass balance techniques, that water–rock interactions do not
control the hydrochemistry at our study site within a granite terrain in
southwest Victoria, Australia. Instead the chemical species provided by
rainfall are depleted by plant biomass uptake and exported, predominantly
through fire. Regular landscape burning by Aboriginal land users is
hypothesized to have caused the depletion of chemical species in groundwater
for at least the past 20 000 yr by accelerating the export of elements that
would otherwise have been stored within the local biomass. These findings are
likely to be applicable to silicate terrains throughout southeast Australia,
as well as similar lithological and climatic regions elsewhere in the globe,
and contrast with studies of groundwater and surface water chemistry in
higher rainfall areas of the Northern Hemisphere, where water–rock
interactions are the dominant hydrochemical control. |
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