The effect of grass maturing and root decay on N2O production in soil |
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Authors: | Hanne Beck Søren Christensen |
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Affiliation: | (1) State Laboratory for Crop and Soil Research, DK-2800 24 Lottenborgvej, Lyngby, Denmark;(2) Present address: Institute of Population Biology, Copenhagen University, Universitetsparken 15, DK-2100 Copenhagen |
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Abstract: | The N2O flux from the surface of grass-covered pots was only significant following grass maturing. Removal of the above-ground plant material resulted in an immediate and long-lasting increase in N2O production in the soil. The results suggest that easily available organic matter from the roots stimulates the denitrification when the plants are damaged. Grass cutting might therefore result in a marked nitrogen loss through denitrification. The quantitative effect was equal in soil with and without succinate added. The size of the anaerobic zone around the roots is therefore sufficient to allow for denitrification activity mediated by increased organic matter availability because of plant cutting. |
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Keywords: | denitrification N2O flux organic matter root soil |
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