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RESEARCH ARTICLE

Variations in soil organic carbon for two soil types and six land uses in the Murray Catchment, New South Wales, Australia

M. C. Davy A C and T. B. Koen B
+ Author Affiliations
- Author Affiliations

A Murray Catchment Management Authority, PMB 797, Albury, NSW 2640, Australia.

B Office of Environment and Heritage, Department of Premier and Cabinet, PMB 445, Cowra, NSW 2794, Australia.

C Corresponding author. Email: mickdavy@hotmail.com

Soil Research 51(8) 631-644 https://doi.org/10.1071/SR12353
Submitted: 1 December 2012  Accepted: 14 May 2013   Published: 15 July 2013

Abstract

The aim of this study was to investigate variations in soil organic carbon (SOC) for two soil types and six common land uses in the New South Wales Murray Catchment and to explore the factors influencing those variations. Samples were collected from 100 sites on duplex soils (Ustalfs) of the Slopes region, and 100 sites on red-brown earths (Xeralfs) of the Plains region. Stocks of SOC (0–30 cm) across the study area ranged between 22.3 and 86.0 t ha–1, with means (± s.e.) of 42.0 ± 1.3 and 37.9 ± 0.8 t ha–1 for the Slopes and Plains regions, respectively. Higher SOC stocks were present in pasture-dominated land uses compared with mixed cropping in the Slopes region, with particularly high stocks found in pastures at positions on a slope of 7–10%. No significant differences in SOC stocks were identified between land-use groups (pastures or cropping) in the Plains region (<500-mm rainfall zone). Significant correlations were found between SOC and a range of climatic, topographical, and soil physico-chemical variables at both the catchment and sub-regional scale. Soil physico-chemical and topographical factors play an important role in explaining SOC variation and should be incorporated into models that aim to predict SOC sequestration across agricultural landscapes.

Additional keywords: aluminium, bulk density, phosphorus, potassium, sodium, topography.


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