Combining management based indices with environmental parameters to explain regional variation in soil carbon under dryland cropping in South Australia
Lynne M. Macdonald A B D , Tim Herrmann C and Jeffrey A. Baldock A B
+ Author Affiliations
- Author Affiliations
A CSIRO Sustainable Agriculture Flagship.
B CSIRO Land and Water, Urrbrae, SA 5064, Australia.
C Department of Environment, Water, and Natural Resources, Government of South Australia, Urrbrae, SA 5064, Australia.
D Corresponding author. Email: lynne.macdonald@csiro.au
Soil Research 51(8) 738-747 https://doi.org/10.1071/SR13156
Submitted: 15 May 2013 Accepted: 16 August 2013 Published: 20 December 2013
Abstract
Identifying drivers of variation in soil organic carbon (OC) at a regional scale is often hampered by a lack of historical management information. Focusing on red-brown-earth soils (Chromosol) under dryland agriculture in the Mid-North and Eyre Peninsula of South Australia, our aims were 2-fold: (i) to provide a baseline of soil OC stocks (0.3 m) and OC fractions (mid-infrared predictions of particulate, humus, and resistant OC in 0.1 m samples) in cropping and crop-pasture systems; and (ii) to evaluate whether the inclusion of management-based indices could assist in explaining regional-level variation in OC stocks and fractions. Soil OC stocks in both regions varied ~20 Mg ha–1, with higher OC stocks in the Mid-North (38 Mg ha–1) than the Eyre Peninsula (29.1 Mg ha–1). The humus OC fraction was the dominant fraction, while the particulate OC was the most variable. Environmental variables only partially explained soil OC variability, with vapour pressure deficit (VPD) offering the greatest potential and likely acting as an integrator of temperature and moisture on plant growth and decomposition processes. Differences between broad-scale cropping and crop–pasture systems were limited. In the Mid-North, variability in soil OC stocks and fractions was high, and could not be explained by environmental or management variables. Higher soil OC concentrations (0.1 m) in the Eyre Peninsula cropping than crop–pasture soils were largely accounted for in the particulate OC fraction and are therefore unlikely to represent a long-term stable OC pool. Use of the management data in index format added some explanatory power to the variability in OC stocks over the main environmental variables (VPD, slope) within the Eyre Peninsula cropping soils only. In the wider context, the management data were useful in interpreting differences between regional findings and highlighted difficulties in using uninformed, broad-scale management categories.
Additional keywords: Chromosol, legume, pasture, soil organic matter, vapour pressure deficit.
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