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Non-symbiotic N2-fixation in acidic and pH-neutral forest soils : Aerobic and anaerobic differentials

Title 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