Three long-term trials end with a quasi-equilibrium between soil C, N, and pH: An implication for C sequestration

Conyers, Mark and Newton, Philip and Condon, Jason and Poile, Graeme and Mele, Pauline and Ash, Gavin (2012) Three long-term trials end with a quasi-equilibrium between soil C, N, and pH: An implication for C sequestration. Soil Research, 50 (7). pp. 527-535. ISSN 1838-675X

Abstract

The aim of this study was to assess the long-term changes in some key soil chemical properties at the completion of three long-term trials in south-eastern Australia and the relationship between those soil properties. From a soil organic matter perspective, the build-up of carbon (%C) requires an accumulation of nitrogen (%N), and the build-up of %C and %N fertility comes at the cost of soil acidity. Rotation, tillage, and stubble practices combine to alter the quantity, quality (C:N), and the depth distribution of organic matter in a soil, but the three soil chemical properties reported here seem to also be in quasi-equilibrium at the three long-term sites. The consequence is that if the build-up of soil organic matter leads to soil acidification, then the maintenance of agricultural production will require liming. The emission of CO2 when limestone reacts with soil acids, plus the C cost of limestone application, will negate a proportion of the gains from C sequestration as organic matter in soil. Such cautionary information was doubtless unforeseen when these three long-term trials were initiated.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 31 May 2017 05:47
Last Modified: 31 May 2017 05:47
Uncontrolled Keywords: organic matter; soil acidification; Agricultural productions; Australia; C sequestration; Depth distribution; Long-term changes; N fertility; Quasi-equilibrium; Soil acidifications; Soil acidity; Soil chemical property; Soil organic matters; Soil property; General; Agricultural Equipment and Methods; Inorganic Compounds; Organic Compounds; Soils and Soil Mechanics; Geochemistry; Biological Materials; Masonry Materials;
Fields of Research : 05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970105 Expanding Knowledge in the Environmental Sciences
Identification Number or DOI: 10.1071/SR12185
URI: http://eprints.usq.edu.au/id/eprint/32067

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