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B&uuml;cker, A.; Crespo, P.; Frede, H.; Vach&eacute;, K.; Cisneros, F. &amp; Breuer, L. (2010): <b>Identifying Controls on Water Chemistry of Tropical Cloud Forest Catchments: Combining Descriptive Approaches and Multivariate Analysis</b>. <i>Aquatic Geochemistry</i> <b>16</b>(1), 127-149<br>DOI: <a href="http://dx.doi.org/10.1007/s10498-009-9073-4" target="_blank">http://dx.doi.org/10.1007/s10498-009-9073-4</a>.

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
Contact:
Individual: Patricio Crespo
Contact:
Individual: Hans-Georg Frede
Contact:
Individual: Kellie Vaché
Contact:
Individual: Felipe Cisneros
Contact:
Individual: Lutz Breuer
Contact:
Abstract:
Abstract We investigated controls on the water chemistry of a South Ecuadorian cloud<br/> forest catchment which is partly pristine, and partly converted to extensive pasture. From<br/> April 2007 to May 2008 water samples were taken weekly to biweekly at nine different<br/> subcatchments, and were screened for differences in electric conductivity, pH, anion, as<br/> well as element composition. A principal component analysis was conducted to reduce<br/> dimensionality of the data set and define major factors explaining variation in the data.<br/> Three main factors were isolated by a subset of 10 elements (Ca2?, Ce, Gd, K?, Mg2?,<br/> Na?, Nd, Rb, Sr, Y), explaining around 90% of the data variation. Land-use was the major<br/> factor controlling and changing water chemistry of the subcatchments. A second factor was<br/> associated with the concentration of rare earth elements in water, presumably highlighting<br/> other anthropogenic influences such as gravel excavation or road construction. Around<br/> 12% of the variation was explained by the third component, which was defined by the<br/> occurrence of Rb and K and represents the influence of vegetation dynamics on element<br/> accumulation and wash-out. Comparison of base- and fast flow concentrations led to the<br/> assumption that a significant portion of soil water from around 30 cm depth contributes to<br/> storm flow, as revealed by increased rare earth element concentrations in fast flow samples.<br/> Our findings demonstrate the utility of multi-tracer principal component analysis to study<br/> tropical headwater streams, and emphasize the need for effective land management in<br/> cloud forest catchments.
Additional Infos:
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Keywords:
| Ecuador | water quality | land-use change | rare earth elements | principal component analysis | tropical cloud forest |
Literature type specific fields:
ARTICLE
Journal: Aquatic Geochemistry
Volume: 16
Issue: 1
Page Range: 127-149
Publisher: Springer
Metadata Provider:
Individual: Bernhard Runzheimer
Contact:
Online Distribution:
Download File: http://www.lcrs.de/publications.do?citid=710


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