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Title: Does Soil Carbon Loss in Biomass Production Systems Negate the Greenhouse Benefits of Bioenergy?
Contributor(s): Cowie, Annette  (author); Smith, Pete (author); Johnson, Dale (author)
Publication Date: 2006
DOI: 10.1007/s11027-006-9030-0
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Abstract: Interest in bioenergy is growing across the Western world in response to mounting concerns about climate change. There is a risk of depletion of soil carbon stocks in biomass production systems, because a higher proportion of the organic matter and nutrients are removed from the site, compared with conventional agricultural and forestry systems. This paper reviews the factors that influence soil carbon dynamics in bioenergy systems, and utilises the model FullCAM to investigate the likely magnitude of soil carbon change where bioenergy systems replace conventional land uses. Environmental and management factors govern the magnitude and direction of change. Soil C losses are most likely where soil C is initially high, such as where improved pasture is converted to biomass production. Bioenergy systems are likely to enhance soil C where these replace conventional cropping, as intensively cropped soils are generally depleted in soil C. Measures that enhance soil C include maintenance of productivity through application of fertilisers, inclusion of legumes, and retention of nutrient-rich foliage on-site. Modelling results demonstrate that loss of soil carbon in bioenergy systems is associated with declines in the resistant plant matter and humified soil C pools. However, published experimental data and modelling results indicate that total soil C loss in bioenergy systems is generally small. Thus, although there may be some decline in soil carbon associated with biomass production, this is negligible in comparison with the contribution of bioenergy systems towards greenhouse mitigation through avoided fossil fuel emissions.
Publication Type: Journal Article
Source of Publication: Mitigation and Adaptation Strategies for Global Change, 11(5-6), p. 979-1002
Publisher: Springer Netherlands
Place of Publication: The Netherlands
ISSN: 1573-1596
Field of Research (FOR): 050101 Ecological Impacts of Climate Change
Socio-Economic Outcome Codes: 960302 Climate Change Mitigation Strategies
960301 Climate Change Adaptation Measures
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Journal Article
School of Environmental and Rural Science

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