Compositional relationships between organic matter in a grassland soil and its drainage waters

Hayes, T. M., Hayes, M. H. B., Skjemstad, J. O. and Swift, R. S. (2008) Compositional relationships between organic matter in a grassland soil and its drainage waters. European Journal of Soil Science, 59 4: 603-616. doi:10.1111/j.1365-2389.2007.01007.x


Author Hayes, T. M.
Hayes, M. H. B.
Skjemstad, J. O.
Swift, R. S.
Title Compositional relationships between organic matter in a grassland soil and its drainage waters
Journal name European Journal of Soil Science   Check publisher's open access policy
ISSN 1351-0754
1365-2389
Publication date 2008-08-01
Sub-type Article (original research)
DOI 10.1111/j.1365-2389.2007.01007.x
Volume 59
Issue 4
Start page 603
End page 616
Total pages 14
Place of publication Oxford, United Kingdom
Publisher Blackwell Scientific
Language eng
Subject 0503 Soil Sciences
Abstract We present a novel study of the compositional relationships between soil organic components extractable in aqueous extractants and those in sub-soil drainage and surface runoff waters from the soil. The surface soil (0–20 cm) of a stagnogley in long-term grassland was sequentially and exhaustively extracted in aqueous media at pH values of 7, 10.6 and 12.6. Extracts from the soils and their runoff and drainage waters were processed by the procedures of the International Humic Substances Society (IHSS), and fractionated into humic, fulvic, and XAD-4 acids. Elemental, δ13C, δ15N, sugar, amino acids, and solid state CPMAS 13C NMR analyses were used to identify similarities and differences between the fractions from the different extracts. There were few differences between the compositions of drainage water samples taken 1 year apart, and these had compositional features similar to those from the more highly oxidized fractions isolated from the soil at pH 7. There were significant differences between the humic components from the drainage waters and isolated from the soil at pH 7 and those of the humic fractions isolated at the higher pH values whose compositions are more clearly related to origins in plants. The compositions of the surface runoff waters indicate origins in transformed plant and animal manures on the soil surface, whereas those of the deep drainage waters originate in more extensively transformed materials, including products of microbial metabolism. The resin technique used in the fractionation allowed the isolation of novel humic acid fractions from the soil extracts, in particular at pH 7 and 12.6. These fractions clearly originated in microbial sources, were rich in saccharides and amino acids (peptides), and low in lignin-derived components. © 2008 The Authors
Keyword Organic matter
Grassland soil
Humic substances
Q-Index Code C1
Q-Index Status Provisional Code
Additional Notes Published Online: 19 Feb 2008

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Queensland Alliance for Agriculture and Food Innovation
 
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Created: Thu, 03 Sep 2009, 19:49:42 EST by Mr Andrew Martlew on behalf of Faculty Of Nat Resources, Agric & Veterinary Sc