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    N₂O and CO₂ emissions following clover and cellulose incorporation into a New Zealand pastoral soil

    Pal, P.; Clough, Timothy J.; Kelliher, Francis M.; Sherlock, Robert R.
    Abstract
    Clover (Trifolium repens L.) and clover + different proportions of cellulose were incorporated into soil and the nitrous oxide (N₂O) and carbon dioxide (CO₂) emissions measured. Ground, dried clover shoots and cellulose were mixed to carbon: nitrogen (C: N) ratios of ~9 (‘clover only’), 20, 30 and 40. Soil samples were incubated at water–filled pore space (WFPS) of 86% and 20°C. Over 42 d, N₂O emissions from the controls averaged 9 mg/kg soil (6 g total N/kg soil), indistinguishable from the ‘clover only’ (1.5 g N incorporated/kg soil) and ‘C: N 20’ treatments. Corresponding N₂O emissions from the ‘C: N 30’ and ‘C: N 40’ treatments averaged nearly 50% greater (P <0.05) and these two treatment effects were indistinguishable. Over 42 d, CO₂ emissions from the controls averaged 4 g/kg soil. There was a linear C (incorporation rate) ‘dose effect’ on CO₂ emissions (0.15 g CO₂/g C, R² = 0.80) with no difference between clover and clover + cellulose. Over 145 d, CO₂ emissions from the controls averaged 17 g/kg soil and the C ‘dose effect’ was 0.38 g CO₂/g C (R² = 0.98). Incorporating different plant materials into soil affected the N₂O and CO₂ emissions differently.... [Show full abstract]
    Keywords
    dose effect; C: N ratio; decomposition; plant litter; nitrous oxide; carbon dioxide
    Date
    2010-08
    Type
    Conference Contribution - published (Conference Paper)
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    • Department of Soil and Physical Sciences [488]
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    © 2010 19th World Congress of Soil Science, Soil Solutions for a Changing World. Archived with publisher permission.
    Citation
    Pal, P., Clough, T. J., Kelliher, F. M., Sherlock, R. R. (2010). N₂O and CO₂ emissions following clover and cellulose incorporation into a New Zealand pastoral soil. In R. J. Gilkes & N. Prakongkep (Eds.), Soil Solutions for a Changing World: Proceedings of the 19th World Congress of Soil Science, Brisbane, Australia, 1-6 August 2010. Symposium 4 ; Greenhouse gases from soils (pp. 154-157). Brisbane, Australia: IUSS.
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