Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/928610

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Title
Relationships between ¹³⁷Cs and soil organic carbon (SOC) in cultivated and never-cultivated soils: an Australian example
Author/Creator
Martinez, C.;  Hancock, G. R.;  Kalma, J. D.
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Sciences
Description
The relationship between soil redistribution processes (i.e. soil erosion and deposition), using the caesium-137 (¹³⁷Cs) method, and the movement, storage and loss of soil organic carbon (SOC) are examined for a small catchment in south-eastern Australia. While recent studies have found strong and statistically significant relationships between ¹³⁷Cs and SOC within heavily cultivated (i.e. highly disturbed) landscapes, there has been a dearth of studies in uncultivated conditions. The site used in this study is characterized by different land use histories and soil types and therefore offers a unique opportunity to investigate the relationship between ¹³⁷Cs and SOC for both cultivated and uncultivated conditions. Depth distribution profiles and hillslope transects were sampled for ¹³⁷Cs and SOC to examine the relationship between the redistribution of soil particles and SOC at the point and hillslope scale. It was noted that the distribution of ¹³⁷Cs and SOC with depth in the soil profile differs among land use and soil types. The relationship between ¹³⁷Cs and SOC was also investigated, with results indicating that there was no relationship between ¹³⁷Cs and SOC for uncultivated hillslopes. In contrast, strong and statistically significant relationships were found for the previously cropped transects. The lack of a relationship within uncultivated hillslope areas in the current study appears to indicate that SOC and ¹³⁷Cs are not moving along the same physical pathways or by the same mechanisms, rather it is suggested that the spatial distribution of SOC is a result of biological factors (e.g. biological oxidation, mineralization). The results of this study suggest that the use of ¹³⁷Cs data to predict SOC redistribution patterns in grazing, largely undisturbed landscapes is problematic. Caution is thus required before using ¹³⁷Cs to predict the spatial distribution of SOC within uncultivated landscapes in this region of Australia, and within similar dry climatic regions.
Relation
Geoderma Vol. 158, Issue 3-4, p. 137-147
Publisher Link
http://dx.doi.org/10.1016/j.geoderma.2010.04.019
Date
2010
Publisher
Elsevier
Keyword(s)
soil organic carbon (SOC);  caesium-137 (¹³⁷Cs);  soil erosion
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/928610
Identifier
ISSN:0016-7061
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Subject
"Geoderma"
 
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