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<identifier>oai:HAL:hal-01032201v1</identifier>
<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Nitrogen cycling in the tropical rain forest of French Guiana: comparison of two sites with contrasting soil types using delta 15N</title>
<creator>ROGGY, Jean-Christophe</creator>
<creator>Prévost, Marie-Françoise</creator>
<creator>GARBAYE, Jean</creator>
<creator>Domenach, Anne-Marie</creator>
<contributor>Ecologie des forêts de Guyane (ECOFOG) ; Ecole Nationale du Génie Rural, des Eaux et des Forêts (ENGREF) - Institut National de la Recherche Agronomique (INRA) - Université des Antilles et de la Guyane (UAG) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Interactions Arbres-Microorganismes (IAM) ; Institut National de la Recherche Agronomique (INRA) - Université de Lorraine (UL)</contributor>
<source>ISSN: 0266-4674</source>
<source>EISSN: 1469-7831</source>
<source>Journal of Tropical Ecology</source>
<publisher>Cambridge University Press (CUP)</publisher>
<identifier>hal-01032201</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01032201</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01032201</source>
<source>Journal of Tropical Ecology, Cambridge University Press (CUP), 1999, 15 (1), pp.1-22. 〈10.1017/S0266467499000644〉</source>
<identifier>DOI : 10.1017/S0266467499000644</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1017/S0266467499000644</relation>
<language>en</language>
<subject>[SDV.SA] Life Sciences [q-bio]/Agricultural sciences</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The natural 15N abundance method for estimating symbiotic biological N2-fixation was tested on legume trees from two rain forests on contrasting soils (oxisols and spodosols) in French Guiana. When possible, the significance of N2-fixing species in the plant community was evaluated in terms of density, biomass and contribution of N2-fixation to the building up of the total nitrogen mass in the leaves. Of the two sites, the rain forest on spodosols was the less favourable for application of the [delta]15N method: the available soil nitrogen was isotopically similar to fixed-N2. Hence, the results showed that a reliable estimate of N2-fixation could not be obtained. A substantial contribution of fixed-N2 to the nitrogen nutrition of legumes was found on oxisols, with an average value of 54 % Ndfa (Nitrogen derived from the atmosphere). The contribution of the N2-fixing legumes to the biomass of the stand was estimated to be 2 t ha[minus sign]1 for the leaf biomass and 136 t ha[minus sign]1 for the total above-ground plant biomass. With 7.5 % of trees in the stand able to fix N2 (462 out of 6156), N2-fixation was estimated to be 7 kg ha[minus sign]1 y[minus sign]1. These results are the first use of the [delta]15N method to estimate nitrogen input by N2-fixing legumes to a natural rain forest. The inter-site variability observed in the [delta]15N of the non-fixing plants suggested different nitrogen-cycling processes in the two soils. The [delta]15N of the non-N2-fixing plants could be related to the soil nitrogen availability and be used as an indicator of efficient or non-efficient nitrogen-cycling rain forests. The spatial variability of the [delta]15N in the plant-available soil nitrogen pool and the nitrogen balance in tropical rain forests are discussed.</description>
<date>1999</date>
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