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Soil, land care and environmental research
RESEARCH ARTICLE

Land use and management influences on surface soil organic carbon in Tasmania

W. E. Cotching A C , G. Oliver B , M. Downie B , R. Corkrey B and R. B. Doyle B
+ Author Affiliations
- Author Affiliations

A Tasmanian Institute of Agriculture/School of Agricultural Science, University of Tasmania, PO Box 3523, Burnie, Tas. 7320, Australia.

B Tasmanian Institute of Agriculture/School of Agricultural Science, University of Tasmania, PO Box 54, Hobart, Tas. 7001, Australia.

C Corresponding author. Email: bill.cotching@gmail.com

Soil Research 51(8) 615-630 https://doi.org/10.1071/SR12251
Submitted: 3 September 2012  Accepted: 2 May 2013   Published: 17 June 2013

Abstract

The effects of environmental parameters, land-use history, and management practices on soil organic carbon (SOC) concentrations, nitrogen, and bulk density were determined in agricultural soils of four soil types in Tasmania. The sites sampled were Dermosols, Vertosols, Ferrosols, and a group of texture-contrast soils (Chromosol and Sodosol) each with a 10-year management history ranging from permanent perennial pasture to continuous cropping. Rainfall, Soil Order, and land use were all strong explanatory variables for differences in SOC, soil carbon stock, total nitrogen, and bulk density. Cropping sites had 29–35% less SOC in surface soils (0–0.1 m) than pasture sites as well as greater bulk densities. Clay-rich soils contained the greatest carbon stocks to 0.3 m depth under pasture, with Ferrosols containing a mean of 158 Mg C ha–1, Vertosols 112 Mg C ha–1, and Dermosols 107 Mg C ha–1. Texture-contrast soils with sandier textured topsoils under pasture had a mean of 69 Mg C ha–1. The range of values in soil carbon stocks indicates considerable uncertainty in baseline values for use in soil carbon accounting. Farmers can influence SOC more by their choice of land use than their day-to-day soil management. Although the influence of management is not as great as other inherent site variables, farmers can still select practices for their ability to retain more SOC.


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