Studies on the Role of Nitrogen Fixation in the Várzea Floodplain Forest - 
Preliminary Results Using the ¹⁵N Natural Abundance Method

Kreibich, H.; Kern, Jürgen

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Studies on the Role of Nitrogen Fixation in the Várzea Floodplain Forest - Preliminary Results Using the ¹⁵N Natural Abundance Method

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Kern, Jürgen
Working Group Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Kreibich, H., & Kern, J. (2002). Studies on the Role of Nitrogen Fixation in the Várzea Floodplain Forest - Preliminary Results Using the ¹⁵N Natural Abundance Method. In R. Lieberei, H. Bianchi, V. Boehm, & C. Reisdorff (Eds.), Neotropical Ecosystems: Proceedings of the German-Brazilian Workshop, Hamburg 2000 (pp. 485-488). Geesthacht: GKSS-Forschungszentrum.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-DDDC-6

Abstract

In a Várzea floodplain forest, nitrogen fixation of legume-rhizobium symbioses was investigated using the ¹⁵N natural abundance method. Mean δ¹⁵N values in soil were positive and ranged from 5.0 to 5.8, average δ¹⁵N value in litter was 3.9 and therefore depleted in ¹⁵N by comparison with soil. Mean δ¹⁵N values in legumes were low by comparison with non-legumes and varied between 0.94 - 4.90. In non-legumes mean δ¹⁵N values were 3.17 - 7.79. Estimation of the proportion of nitrogen derived from atmospheric N₂ resulted in mean values of 60% Ndfa for Zygia inaequalis, 37%Ndfa for Albizia multiflora and 32% Ndfa for Pterocarpus amazonum. Legume trees showed a high inter- and intraspecific variation in their per cent nitrogen derived from atmosphere (%Ndfa), but there was no significant temporal variation of nitrogen fixation by rhizobium-legume symbioses from October 1998 to April 1999. N₂ fixation was an important source of nitrogen for nodulated legume trees and therefore might have been of certain importance for the biomass production of the forest