Cite as:
Bücker, A.; Crespo, P.; Frede, H.; Vaché, K.; Cisneros, F. & Breuer, L. (2010): Identifying Controls on Water Chemistry of Tropical Cloud Forest Catchments: Combining Descriptive Approaches and Multivariate Analysis. Aquatic Geochemistry 16(1), 127-149

Resource Description

Title: Identifying Controls on Water Chemistry of Tropical Cloud Forest Catchments: Combining Descriptive Approaches and Multivariate Analysis
Short Name: Identifying controls on water chemistry
FOR816dw ID: 710
Publication Date: 2010-01-01
License and Usage Rights:
Resource Owner(s):
Individual: Amelie Bücker
Individual: Patricio Crespo
Individual: Hans-Georg Frede
Individual: Kellie Vaché
Individual: Felipe Cisneros
Individual: Lutz Breuer
Abstract 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.
Additional Infos:
This is online first, the printed version is not available yet
| Ecuador | water quality | land-use change | rare earth elements | principal component analysis | tropical cloud forest |
Literature type specific fields:
Journal: Aquatic Geochemistry
Volume: 16
Issue: 1
Page Range: 127-149
Publisher: Springer
Metadata Provider:
Individual: Bernhard Runzheimer
Online Distribution:
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