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Rummel, Pauline Sophie ; Well, Reinhard ; Pfeiffer, Birgit ; Dittert, Klaus ; Floßmann, Sebastian ; Pausch, Johanna:
Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?
In: Plant and Soil.
Bd. 459
(2021)
.
- S. 217-233.
ISSN 1573-5036
DOI: https://doi.org/10.1007/s11104-020-04750-7
Abstract
Background and aims
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.
Methods
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.
Results
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.
Conclusions
Root-derived C may stimulate denitrification under small plants, while N and water uptake become the controlling factors with increasing plant and root growth.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Agrarökologie > Professur Agrarökologie - Juniorprof. Dr. Johanna Pausch |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie 500 Naturwissenschaften und Mathematik > 570 Biowissenschaften; Biologie |
| Eingestellt am: | 17 Okt 2023 05:10 |
| Letzte Änderung: | 17 Okt 2023 05:10 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/87251 |