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Journal Article

Denitrification coupled to nitrification in the rhizosphere of rice

MPS-Authors

Arth,  I
Department of Biogeochemistry, Alumni, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;

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Frenzel,  P.
Department of Biogeochemistry, Alumni, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;

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Conrad,  R       
Department of Biogeochemistry, Alumni, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;

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Citation

Arth, I., Frenzel, P., & Conrad, R. (1998). Denitrification coupled to nitrification in the rhizosphere of rice. Soil Biology and Biochemistry, 30(4), 509-515. doi:10.1016/S0038-0717(97)00143-0.


Cite as: https://hdl.handle.net/21.11116/0000-000F-CB74-A
Abstract
The N-2 flux method, which has only been used for marine sediments, was
adapted to a vegetated submerged soil. Denitrification was measured by
the emission of N-2 from the rice rhizosphere and the bulk soil in flux
chambers with a He + O-2 (79/21%) atmosphere. Without addition of
N-fertilizer, no N-2 emission was detected. However, after the addition
of urea a high rate of N-2 emission was observed. Mean rate was
34.3+/-3.8 nmol N h(-1) cm(-2) (+/-SE). By the application of the
nitrification inhibitor methyl fluoride (1%), the N-2 emission decreased
by nearly 80%, indicating that nitrification of urea-N to nitrate or
nitrite was necessary for denitrification. For the localization of this
coupled nitrification-denitrification process rice plants were clipped
below the water surface. Clipping resulted in a considerable decrease of
N-2 emission (3.6+/-0.3 nmol N h(-1) cm(-2)). Measurements of N2O
emission gave similar results (0.350+/-0.035 nmol N h(-1) cm(-2) for
microcosms with intact plants and 0.034+/-0.3 nmol N h(-1) cm(-2) for
microcosms with clipped plants). These experiments showed that the
aerenchymateous rice plants are important for the transport of O-2 and
N-2 into and from the rhizosphere. The rhizosphere is the major site of
coupled nitrification-denitrification in planted rice soil. (C) 1998
Elsevier Science Ltd. All rights reserved.