at Google ScholarTitle data
Limmer, Claudia ; Drake, Harold L.:
Non-symbiotic N2-fixation in acidic and pH-neutral forest soils : Aerobic and anaerobic differentials.
In: Soil Biology & Biochemistry.
Vol. 28
(1996)
Issue 2
.
- pp. 177-183.
ISSN 0038-0717
DOI: https://doi.org/10.1016/0038-0717(95)00118-2
Abstract in another language
The effects of aerobic and anaerobic conditions on nitrogenase activities in forest soils (in particular that of a beech forest) obtained from northeast Bavaria (Germany) were assessed by both acetylene reduction and 15N2-fixation methods. Nitrogenase activity occurred without detectable delay under both aerobic and anaerobic conditions; in both cases, initial rates approximated 0.2 nmol C2H2 reduced per g dry weight soil per day. Prolonged anaerobic conditions yielded rates approximating 6 nmol C2H2 reduced per g dry weight soil per day; in contrast, rates remained relatively constant under aerobic conditions independent of the incubation period. When soils were amended with glucose, significantly higher acetylene reduction rates (1-4 & micromol C2H2 reduced per gram dry weight soil per day) occurred only under anaerobic conditions. Assays with 15N2 confirmed this N2-fixation activity; based on initial reaction rates with moistened, but otherwise unamended soils, estimated N2 fixation activity approximated 0.2 kg N fixed per hectare per year. Compared to activities obtained under static conditions, shifts from aerobic to anaerobic conditions greatly enhanced N2-fixation activities. High anaerobic/aerobic activity ratios were obtained with both pH neutral and weakly acidic (pH 4.5-5.9) hardwood and coniferous forest soils. These consistently high anaerobic N2-fixation activities indicate that this process is likely limited to O2-deficient microsites in forest soils. No nitrogenase activity was detected with extremely acidic coniferous forest soils (pH 2.7-3.3) under either anaerobic or aerobic conditions.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Additional notes: | BAYCEER7113 |
| Institutions of the University: | Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Ecological Microbiology Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology Research Institutions Research Institutions > Research Centres |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science |
| Date Deposited: | 30 Sep 2015 05:56 |
| Last Modified: | 30 Sep 2015 05:56 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/20006 |