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Type: Journal article
Title: Binding of water-extractable organic carbon to clay subsoil: effects of clay subsoil properties
Author: Lim, S.
Nguyen, T.
Marschner, P.
Citation: Soil Research, 2015; 53(1):81-86
Publisher: CSIRO Publishing
Issue Date: 2015
ISSN: 1838-675X
Statement of
Shinhuey Lim, Trung-Ta Nguyen, and Petra Marschner
Abstract: Addition of clay-rich subsoils to sandy soils can increase yield and may increase organic carbon (OC) retention in soils. The ability of clays to bind OC is likely to be influenced by clay properties, but little is known about the relative importance of properties of clay subsoils for binding of OC. A batch sorption experiment was conducted using seven clay subsoils collected from agricultural lands where claying was carried out. Clay subsoils were shaken for 17 h at 4°C with different concentrations of water-extractable OC (WEOC: 0, 2.5, 5.0, 7.5, and 9.0 g kg⁻¹ soil) derived from mature wheat (Triticum aestivum L.) straw at a 1 : 10 soil : extract ratio. Sorption of WEOC was positively correlated with clay content, specific surface area and concentration of iron oxides. Further, WEOC sorption was negatively correlated with total OC content, sodium absorption ratio and cation ratio of soil structural stability. However, the relative importance of these properties for WEOC sorption differed among soils. In conclusion, OC retention in clay-amended sandy soils will be positively related to clay soil properties such as clay and Fe oxide content and specific surface area.
Keywords: Clay subsoils; iron oxides; SAR, sorption; SSA; water-extractable organic carbon
Rights: Journal compilation © CSIRO 2015
DOI: 10.1071/SR14053
Appears in Collections:Agriculture, Food and Wine publications
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