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Quantifying the potential contribution of soil carbon to orchard carbon footprints

Citation

Gentile, RM and Perie, E and Muller, K and Deurer, M and Mason, K and van den Dijssel, C and Clothier, BE and Holmes, A and Hardie, M and McLaren, SJ, Quantifying the potential contribution of soil carbon to orchard carbon footprints, Acta Horticulturae, 1112 pp. 461-466. ISSN 0567-7572 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 ISHS Acta Horticulturae

DOI: doi:10.17660/ActaHortic.2016.1112.62

Abstract

Increasing soil carbon is promoted to growers as a means of increasing soil function and mitigating climate change. However, the importance of soil carbon is not yet fully acknowledged in life cycle assessment guidelines. Because of their perennial nature and deep rooting systems, orchards have the potential to increase subsoil carbon stocks below 0.3 m depth. Quantifying soil carbon stocks at the orchard scale, however, requires sampling protocols that incorporate the spatial variability of carbon in orchards. We have investigated soil carbon stocks to 1 m depth in apple orchards in Australia and New Zealand and found that total carbon stocks were maintained over 4 to 12 years. Orchard floor management practices can create a spatial distribution of shallow soil carbon stocks, and we observed a trend for decreasing surface-soil carbon stocks under the alley. Additionally, we determined soil carbon stocks to 9 m depth in a New Zealand kiwifruit orchard and calculated an increase of 190 t C ha-1 after 30 years compared with that in the nearby pasture soil that was the antecedent land-use. This increase in soil carbon equates to 42% of the carbon footprint of New Zealand kiwifruit on United Kingdom supermarket shelves. Therefore, accurately quantifying soil carbon stock changes under orchard systems presents a potential opportunity to reduce horticultural carbon footprints.

Item Details

Item Type:Refereed Article
Keywords:apple orchard, carbon stocks, kiwifruit orchard, life cycle assessment, subsoil
Research Division:Environmental Sciences
Research Group:Soil Sciences
Research Field:Carbon Sequestration Science
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Farmland, Arable Cropland and Permanent Cropland Land Management
Author:Hardie, M (Mr Marcus Hardie)
ID Code:109065
Year Published:2016
Deposited By:TIA - Research Institute
Deposited On:2016-05-18
Last Modified:2017-04-24
Downloads:0

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