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Can Ph and Electrical Conductivity Monitoring Reveal Spatial and Temporal Patterns in Wetland Geochemical Processes? : Volume 10, Issue 1 (16/01/2013)

By Gerla, P. J.

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Book Id: WPLBN0004011799
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Can Ph and Electrical Conductivity Monitoring Reveal Spatial and Temporal Patterns in Wetland Geochemical Processes? : Volume 10, Issue 1 (16/01/2013)  
Author: Gerla, P. J.
Volume: Vol. 10, Issue 1
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: copernicus

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Gerla, P. J. (2013). Can Ph and Electrical Conductivity Monitoring Reveal Spatial and Temporal Patterns in Wetland Geochemical Processes? : Volume 10, Issue 1 (16/01/2013). Retrieved from http://ebook.worldlibrary.net/


Description
Description: The Nature Conservancy – Minnesota, North Dakota, and South Dakota Chapter, 81 Cornell Street Stop 8358, Grand Forks, North Dakota 58202-8358, USA. Carbonate reactions and equilibria play a dominant role in the biogeochemical function of many wetlands. The US Geological Survey PHREEQC computer code was used to model geochemical reactions that may be typical for wetlands with water budgets characterized by: (a) input dominated by direct precipitation, (b) interaction with groundwater, (c) variable degrees of reaction with organic carbon, and (d) different rates of evapotranspiration. Rainfall with a typical composition was progressively reacted with calcite and organic carbon at various rates and proportions using PHREEQC. Contrasting patterns of the results suggest that basic water quality data collected in the field can reveal differences in the geochemical processes in wetlands. Given a temporal record, these can signal subtle changes in surrounding land cover and use. To demonstrate this, temperature, pH, and electrical conductivity (EC) were monitored for three years in five large wetlands comprising 48 sample sites in northwest Minnesota. EC and pH of samples ranged greatly – from 23 to 1300 ΜS cm−1 and 5.5 to 9. The largest range in pH was observed in small beach ridge wetlands, where two clusters are apparent: (1) low EC and a wide range of pH and (2) higher pH and EC. Large marshes within a glacial lake – till plain have a broad range of pH and EC, but depend on the specific wetland. Outlying data typically occurred in altered or disturbed areas. The inter-annual and intra-wetland consistency of the results suggests that each wetland system hosts characteristic geochemical conditions.

Summary
Can pH and electrical conductivity monitoring reveal spatial and temporal patterns in wetland geochemical processes?

Excerpt
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