bei Google ScholarTitelangaben
Thiemann, Irabella ; He, Yao ; Siemens, Jan ; Brüggemann, Nicolas ; Lehndorff, Eva ; Amelung, Wulf:
Nitrogen fertilizer fate after introducing maize into a continuous paddy
rice cropping system.
2017
Veranstaltung: European Geosciences Union General Assembly 2017
, 23-28 April 2017
, Wien, Österreich.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Vortrag
)
Abstract
After introducing upland crops into permanent flooded cropping systems, soil conditions temporally change from
anaerobic to aerobic, which profoundly impacts nitrogen (N) dynamics. In the framework of the DFG research unit
1701 ICON we applied a single 15N-urea pulse in a field experiment in the Philippines with three different crop
rotations: continuous paddy rice, paddy rice–dry rice, and paddy rice-maize. Subsequently, we traced the fate of the
labelled urea in bulk soil, rhizosphere, roots, biomass and microbial residues (amino sugars) within the following
two years. 15N recovery in the first 5 cm of bulk soil was highest in the first dry season of continuous paddy rice
cropping (37.8 % of applied 15N) and lowest in the paddy rice–maize rotation (19.2 %). While an accumulation
over time could be observed in bulk soil in 5-20 cm depth of the continuous paddy rice system, the recoveries
decreased over time within the following two years in the other cropping systems. Highest 15N-recovery in shoots
and roots were found in the continuous paddy rice system in the first dry season (27.3 % in shoots, 3.2 % in roots)
as well as in the following wet season (4.2 % in shoots, 0.3 % in roots). Lowest recoveries in biomass were found
for the paddy rice–dry rice rotation. Long-term fixation of 15N in microbial biomass residues was observed in all
cropping systems (2-3 % in the 3rd dry season). The results indicate that the introduction of maize into a continuous
paddy rice cropping system can reduce the fertilizer N use efficiency especially in the first year, most likely due to
nitrate leaching and gaseous losses to the atmosphere.
Weitere Angaben
| Publikationsform: | Veranstaltungsbeitrag (Vortrag) |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie > Lehrstuhl Bodenökologie - Univ.-Prof. Dr. Eva Lehndorff |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie |
| Eingestellt am: | 12 Feb 2026 12:13 |
| Letzte Änderung: | 12 Feb 2026 12:13 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/96228 |