bei Google ScholarTitelangaben
Limmer, Claudia ; Drake, Harold L.:
Effects of carbon, nitrogen, and electron acceptor availability on anaerobic N2-fixation in a beech forest soil.
In: Soil Biology & Biochemistry.
Bd. 30
(1998)
Heft 2
.
- S. 153-158.
ISSN 0038-0717
DOI: https://doi.org/10.1016/S0038-0717(97)00099-0
Abstract
The effects of different energy sources and inhibitors on the nitrogenase activity of a beech forest soil of north-east Bavaria (Germany) was determined by use of the acetylene-reduction method. Sugars and carbohydrates greatly stimulated nitrogenase activity under anaerobic, but not under aerobic, conditions; of the substrates tested, cellobiose yielded the highest anaerobic activity. In contrast, organic acids had no appreciable stimulating effect. Glucose-stimulated anaerobic nitrogenase activity was linked to the formation of butyrate (implicating the involvement of clostridia) and to the apparent growth of anaerobic N2-fixing microorganisms. The N2-fixing microorganisms culturable under anaerobic conditions in unamended soil approximated 105 cells g-1 d. w. soil and increased three orders of magnitude after two days of anaerobic incubation with glucose. In contrast, no N2-fixing microorganisms were culturable under aerobic conditions. Inhibition of anaerobic nitrogenase activity by supplemental ammonium and nitrate occurred in both unamended and glucose-amended soils. Nitrate was sequentially transformed to N2O and N2, with minor amounts also being reduced to ammonium. Thus, nitrate appeared to have an indirect inhibitory effect on N2-fixation, the reduction of nitrate being more competitive for available reductant than N2-fixation. This competitive effect was not observed with sulfate. These results suggest that in situ N2-fixation in the forest soil examined may be regulated in part by the availability of specific reductant sources and the presence of the competing reductant sink nitrate.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER7098 |
| Institutionen der Universität: | Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Ökologische Mikrobiologie Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 30 Sep 2015 05:56 |
| Letzte Änderung: | 30 Sep 2015 05:56 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/19966 |