Solute behaviour and export rates in neotropical montane catchments under different land-uses

Journal of Tropical Ecology

dc.creatorBücker, Amelie
dc.creatorCrespo, Patricio
dc.creatorFrede, Hans Georg
dc.creatorBreuer, Lutz
dc.date2015-06-10T18:31:31Z
dc.date2015-06-10T18:31:31Z
dc.date2011-03-10
dc.date.accessioned2018-03-14T20:12:23Z
dc.date.available2018-03-14T20:12:23Z
dc.identifierhttp://dspace.ucuenca.edu.ec/handle/123456789/22028
dc.identifierdoi.org/10.1017/S0266467410000787
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1129375
dc.descriptionTo improve our knowledge of the influence of land-use on solute behaviour and export rates in neotropical montane catchments we investigated total organic carbon (TOC), Ca, Mg, Na, K, NO3 and SO4 concentrations during April 2007–May 2008 at different flow conditions and over time in six forested and pasture-dominated headwaters (0.7–76 km2) in Ecuador. NO3 and SO4 concentrations decreased during the study period, with a continual decrease in NO3and an abrupt decrease in February 2008 for SO4. We attribute this to changing weather regimes connected to a weakening La Niña event. Stream Na concentration decreased in all catchments, and Mg and Ca concentration decreased in all but the forested catchments during storm flow. Under all land-uses TOC increased at high flows. The differences in solute behaviour during storm flow might be attributed to largely shallow subsurface and surface flow paths in pasture streams on the one hand, and a predominant origin of storm flow from the organic layer in the forested streams on the other hand. Nutrient export rates in the forested streams were comparable to the values found in literature for tropical streams. They amounted to 6–8 kg ha−1 y−1 for Ca, 7–8 kg ha−1 y−1 for K, 4–5 kg ha−1y−1 for Mg, 11–14 kg ha−1 y−1 for Na, 19–22 kg ha−1 y−1 for NO3 (i.e. 4.3–5.0 kg ha−1 y−1 NO3-N) and 17 kg ha−1 y−1 for SO4. Our data contradict the assumption that nutrient export increases with the loss of forest cover. For NO3we observed a positive correlation of export value and percentage forest cover.
dc.descriptionCuenca
dc.descriptionvol. 27; número 03
dc.formatapplication/pdf
dc.languageeng
dc.rightsopenAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/3.0/ec/
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/3.0/ec/
dc.sourceinstname:Universidad de Cuenca
dc.sourcereponame:Repositorio Digital de la Universidad de Cuenca
dc.subjectECUADOR
dc.subjectNITRATE
dc.subjectNUTRIENT EXPORT
dc.subjectRAIN FOREST
dc.subjectTROPICAL STREAMS
dc.titleSolute behaviour and export rates in neotropical montane catchments under different land-uses
dc.titleJournal of Tropical Ecology
dc.typeArtículos de revistas


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