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Estimates of nitrogen fixation by trees on an aridity gradient in Namibia

Title data

Schulze, Ernst-Detlef ; Gebauer, Gerhard ; Ziegler, H. ; Lange, Otto L.:
Estimates of nitrogen fixation by trees on an aridity gradient in Namibia.
In: Oecologia. Vol. 88 (November 1991) Issue 3 . - pp. 451-455.
ISSN 1432-1939
DOI: https://doi.org/10.1007/BF00317592

Abstract in another language

Nitrogen (N2) fixation was estimated along an aridity gradient in Namibia from the natural abundance of 15N (delta-15N value) in 11 woody species of the Mimosaceae which were compared with the delta-15N values in 11 woody non-Mimosaceae. Averaging all species and habitats the calculated contribution of N2 fixation (Nf) to leaf nitrogen (N) concentration of Mimosaceae averaged about 30%, with large variation between and within species. While in Acacia albida Nf was only 2%, it was 49% in Acacia hereroensis and Dichrostachys cinerea, and reached 71% in Acacia melifera. In the majority of species Nf was 10-30%. There was a marked variation in background delta-15N values along the aridity gradient, with the highest delta-15N values in the lowland savanna. The difference between delta-15N values of Mimosaceae and non-Mimosaceae, which is assumed to result mainly from N2 fixation, was also largest in the lowland savanna. Variations in delta-15N of Mimosaceae did not affect N concentrations, but higher delta-15N-values of Mimosaeae are associated with lower carbon isotope ratios (delta-13C value). N2 fixation was associated with reduced intrinsic water use efficiency. The opposite trends were found in non-Mimosaceae, in which N-concentration increased with delta-15N, but delta-13C was unaffected. The large variation among species and sites is discussed.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER25892
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Former Professors
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Former Professors > Chair Plant Ecology - Univ.-Prof. John D. Tenhunen, Ph.D.
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
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: 20 Nov 2015 07:29
Last Modified: 20 Nov 2015 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/22911