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Denitrification and N2O emission from forested and cultivated alluvial clay soil.

Ullah, Sami and Breitenbeck, G. A. and Faulkner, Stephen P. (2005) Denitrification and N2O emission from forested and cultivated alluvial clay soil. Biogeochemistry, 73 (3). pp. 499-513. ISSN 0168-2563

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    Abstract

    Restored forested wetlands reduce N loads in surface discharge through plant uptake and denitrification. While removal of reactive N reduces impact on receiving waters, it is unclear whether enhanced denitrification also enhances emissions of the greenhouse gas N2O, thus compromising the water-quality benefits of restoration. This study compares denitrification rates and N2O:N2 emission ratios from Sharkey clay soil in a mature bottomland forest to those from an adjacent cultivated site in the Lower Mississippi Alluvial Valley. Potential denitrification of forested soil was 2.4 times of cultivated soil. Using intact soil cores, denitrification rates of forested soil were 5.2, 6.6 and 2.0 times those of cultivated soil at 70, 85 and 100% water-filled pore space (WFPS), respectively. When NO3 was added, N2O emissions from forested soil were 2.2 times those of cultivated soil at 70% WFPS. At 85 and 100% WFPS, N2O emissions were not significantly different despite much greater denitrification rates in the forested soil because N2O:N2 emission ratios declined more rapidly in forested soil as WFPS increased. These findings suggest that restoration of forested wetlands to reduce NO3 in surface discharge will not contribute significantly to the atmospheric burden of N2O.

    Item Type: Article
    Journal or Publication Title: Biogeochemistry
    Additional Information: The original publication is available at www.springerlink.com
    Uncontrolled Keywords: Bottomland hardwood - Denitrification - Global climate change - Greenhouse gas - Nitrous Oxide - Sharkey soil - Wetland restoration
    Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
    Departments: Faculty of Science and Technology > Lancaster Environment Centre
    ID Code: 31472
    Deposited By: Dr. Sami Ullah
    Deposited On: 19 Jan 2010 15:20
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 16:58
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/31472

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