Cite as:
Rummel, P.; Well, R.; Peiffer, B.; Dittert, K.; Flo&szlig;mann, S. &amp; Pausch, J. (2020): <b>Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?</b>. <i>Plant and Soil</i> <b>459</b>, 217–233<br>DOI: <a href="" target="_blank"></a>.

Resource Description

Title: Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?
FOR816dw ID: 25
Publication Date: 2020-11-06
License and Usage Rights: DASIM data user agreement. (
Resource Owner(s):
Individual: Pauline Rummel
Individual: Reinhard Well
Individual: Birgit Peiffer
Individual: Klaus Dittert
Individual: Sebastian Floßmann
Individual: Johanna Pausch
Background and aims<br/> Plant growth affects soil moisture, mineral N and organic C availability in soil, all of which influence denitrification. With increasing plant growth, root exudation may stimulate denitrification, while N uptake restricts nitrate availability.<br/> Methods<br/> We conducted a double labeling pot experiment with either maize (Zea mays L.) or cup plant (Silphium perfoliatum L.) of the same age but differing in size of their shoot and root systems. The 15N gas flux method was applied to directly quantify N2O and N2 fluxes in situ. To link denitrification with available C in the rhizosphere, 13CO2 pulse labeling was used to trace C translocation from shoots to roots and its release by roots into the soil.<br/> Results<br/> Plant water and N uptake were the main factors controlling daily N2O?+?N2 fluxes, cumulative N emissions, and N2O production pathways. Accordingly, pool-derived N2O?+?N2 emissions were 30–40 times higher in the treatment with highest soil NO3? content and highest soil moisture. CO2 efflux from soil was positively correlated with root dry matter, but we could not detect any relationship between root-derived C and N2O?+?N2 emissions.<br/> Conclusions<br/> Root-derived C may stimulate denitrification under small plants, while N and water uptake become the controlling factors with increasing plant and root growth.
| denitrification | N2O | N2 | 15N gas flux method | Zea mays L. | Silphium perfoliatum L. | 13CO2 |
Literature type specific fields:
Journal: Plant and Soil
Volume: 459
Page Range: 217–233
Metadata Provider:
Individual: Kristina Kleineidam
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