Influence of soil moisture content on soil solution composition

Dyer, Carmen L., Kopittke, Peter M., Sheldon, Anna R. and Menzies, Neal W. (2008) Influence of soil moisture content on soil solution composition. Soil Science Society of America Journal, 72 2: 355-361. doi:10.2136/sssaj2007.0124


Author Dyer, Carmen L.
Kopittke, Peter M.
Sheldon, Anna R.
Menzies, Neal W.
Title Influence of soil moisture content on soil solution composition
Journal name Soil Science Society of America Journal   Check publisher's open access policy
ISSN 0361-5995
1435-0661
Publication date 2008-03-01
Year available 2008
Sub-type Article (original research)
DOI 10.2136/sssaj2007.0124
Open Access Status Not yet assessed
Volume 72
Issue 2
Start page 355
End page 361
Total pages 7
Place of publication Madison, W.I., U.S.A.
Publisher Soil Science Society of America
Language eng
Subject C1
961205 Rehabilitation of Degraded Mining Environments
050304 Soil Chemistry (excl. Carbon Sequestration Science)
0503 Soil Sciences
Abstract Despite the importance of the soil solution to plant growth, few studies have considered the influence of moisture content on the composition of the soil solution. Indeed, soil solution has seldom been extracted from soils below field capacity, despite the relevance of such conditions to plants grown in the field. Soil solution was extracted from a variable-charge soil (Oxisol) and from several permanent-charge soils (Vertisols) at various moisture contents (potentials ranging from –5 to –230 kPa) using polyacrylonitrile hollow-fiber filter elements and pressure chamber apparatus. For the Vertisols, a decrease in moisture content resulted in a proportionate increase in the soil solution ionic strength, a behavior similar to that expected from a solution without any solid-phase interaction. In contrast, for the Oxisol, the ionic strength remained constant as the soil moisture content decreased due to "salt adsorption." For soils containing excess gypsum (CaSO4·2H2O) or lime (CaCO3), the dissolution (with increasing moisture) and precipitation (with decreasing moisture) of these minerals controlled the solution concentrations of their constituent elements. The soil solution composition appeared to conform to that expected from the ratio law (valency effect). The results of this study provide evidence that the method used can extract representative soil solution from soils at moisture contents lower than field capacity. They also demonstrate that changes in soil solution ionic strength and composition, while obeying simple control mechanisms, could not be readily predicted without a detailed understanding of the soil's surface charge and exchange behavior.© 2008 Soil Science Society of America
Keyword Soil solution
Moisture content
Composition
Oxisol
Vertisols
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 16 Apr 2009, 18:44:41 EST by Emma Cushworth on behalf of School of Land, Crop and Food Sciences