Vista Equipo: Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis

Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis

We investigated controls on the water chemistry of a South Ecuadorian cloud forest catchment which is partly pristine, and partly converted to extensive pasture. From April 2007 to May 2008 water samples were taken weekly to biweekly at nine different subcatchments, and were screened for differences...

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Autores Principales:	Bücker, Amelie, Crespo, Patricio, Frede, Hans Georg, Vaché, Kellie B., Cisneros, Felipe, Breuer, Lutz
Formato:	Artículos
Publicado:	2015
Materias:	ECUADOR TROPICAL CLOUD FOREST PRINCIPAL COMPONENT ANALYSIS WATER QUALITY LAND-USE CHANGE RARE EARTH ELEMENTS
Acceso en línea:	http://dspace.ucuenca.edu.ec/handle/123456789/22063
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spelling	oai:localhost:123456789-220632016-11-20T14:23:17Z Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis Aquatic Geochemistry Bücker, Amelie Crespo, Patricio Frede, Hans Georg Vaché, Kellie B. Cisneros, Felipe Breuer, Lutz ECUADOR TROPICAL CLOUD FOREST PRINCIPAL COMPONENT ANALYSIS WATER QUALITY LAND-USE CHANGE RARE EARTH ELEMENTS We investigated controls on the water chemistry of a South Ecuadorian cloud forest catchment which is partly pristine, and partly converted to extensive pasture. From April 2007 to May 2008 water samples were taken weekly to biweekly at nine different subcatchments, and were screened for differences in electric conductivity, pH, anion, as well as element composition. A principal component analysis was conducted to reduce dimensionality of the data set and define major factors explaining variation in the data. Three main factors were isolated by a subset of 10 elements (Ca2?, Ce, Gd, K?, Mg2?, Na?, Nd, Rb, Sr, Y), explaining around 90% of the data variation. Land-use was the major factor controlling and changing water chemistry of the subcatchments. A second factor was associated with the concentration of rare earth elements in water, presumably highlighting other anthropogenic influences such as gravel excavation or road construction. Around 12% of the variation was explained by the third component, which was defined by the occurrence of Rb and K and represents the influence of vegetation dynamics on element accumulation and wash-out. Comparison of base- and fast flow concentrations led to the assumption that a significant portion of soil water from around 30 cm depth contributes to storm flow, as revealed by increased rare earth element concentrations in fast flow samples. Our findings demonstrate the utility of multi-tracer principal component analysis to study tropical headwater streams, and emphasize the need for effective land management in cloud forest catchments. Cuenca 2015-06-11T15:23:24Z 2015-06-11T15:23:24Z 2010 info:eu-repo/semantics/Article info:eu-repo/semantics/Other http://dspace.ucuenca.edu.ec/handle/123456789/22063 doi: 10.1007/s10498-009-9073-4 eng openAccess http://creativecommons.org/licenses/by-nc-sa/3.0/ec/ application/pdf instname:Universidad de Cuenca reponame:Repositorio Digital de la Universidad de Cuenca info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/3.0/ec/
institution	UCUENCA
collection	Repositorio UCUENCA
universidades	UCUENCA
language
format	Artículos
topic	ECUADOR TROPICAL CLOUD FOREST PRINCIPAL COMPONENT ANALYSIS WATER QUALITY LAND-USE CHANGE RARE EARTH ELEMENTS
spellingShingle	ECUADOR TROPICAL CLOUD FOREST PRINCIPAL COMPONENT ANALYSIS WATER QUALITY LAND-USE CHANGE RARE EARTH ELEMENTS Bücker, Amelie Crespo, Patricio Frede, Hans Georg Vaché, Kellie B. Cisneros, Felipe Breuer, Lutz Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis
description	We investigated controls on the water chemistry of a South Ecuadorian cloud forest catchment which is partly pristine, and partly converted to extensive pasture. From April 2007 to May 2008 water samples were taken weekly to biweekly at nine different subcatchments, and were screened for differences in electric conductivity, pH, anion, as well as element composition. A principal component analysis was conducted to reduce dimensionality of the data set and define major factors explaining variation in the data. Three main factors were isolated by a subset of 10 elements (Ca2?, Ce, Gd, K?, Mg2?, Na?, Nd, Rb, Sr, Y), explaining around 90% of the data variation. Land-use was the major factor controlling and changing water chemistry of the subcatchments. A second factor was associated with the concentration of rare earth elements in water, presumably highlighting other anthropogenic influences such as gravel excavation or road construction. Around 12% of the variation was explained by the third component, which was defined by the occurrence of Rb and K and represents the influence of vegetation dynamics on element accumulation and wash-out. Comparison of base- and fast flow concentrations led to the assumption that a significant portion of soil water from around 30 cm depth contributes to storm flow, as revealed by increased rare earth element concentrations in fast flow samples. Our findings demonstrate the utility of multi-tracer principal component analysis to study tropical headwater streams, and emphasize the need for effective land management in cloud forest catchments.
author	Bücker, Amelie Crespo, Patricio Frede, Hans Georg Vaché, Kellie B. Cisneros, Felipe Breuer, Lutz
author_facet	Bücker, Amelie Crespo, Patricio Frede, Hans Georg Vaché, Kellie B. Cisneros, Felipe Breuer, Lutz
author_sort	Bücker, Amelie
title	Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis
title_short	Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis
title_full	Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis
title_fullStr	Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis
title_full_unstemmed	Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis
title_sort	identifying controls on water chemistry of tropical cloud forest catchments: combining descriptive approaches and multivariate analysis
publishDate	2015
url	http://dspace.ucuenca.edu.ec/handle/123456789/22063
_version_	1635522775484465152
score	11,871979

Identifying controls on water chemistry of tropical cloud forest catchments: Combining descriptive approaches and multivariate analysis

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