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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Differing nitrogen use strategies of two tropical rainforest late successional tree species in French Guiana : evidence from 15N natural abundance and microbial activities</title>
<creator>Schimann, Heidy</creator>
<creator>Ponton, Stéphane</creator>
<creator>Hättenschwiler, Stephan</creator>
<creator>Ferry, Bruno</creator>
<creator>Lensi, Robert</creator>
<creator>Domenach, Anne-Marie</creator>
<creator>ROGGY, Jean-Christophe</creator>
<contributor>Ecologie des forêts de Guyane (ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut National de la Recherche Agronomique (INRA) - Université des Antilles et de la Guyane (UAG) - AgroParisTech - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Centre d'Ecologie Fonctionnelle et Evolutive ; Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire d'Etudes des Ressources Forêt-Bois (LERFoB) ; Institut National de la Recherche Agronomique (INRA) - AgroParisTech</contributor>
<description> </description>
<source>ISSN: 0038-0717</source>
<source>Soil Biology and Biochemistry</source>
<publisher>Elsevier</publisher>
<identifier>hal-01032035</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01032035</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01032035</source>
<source>Soil Biology and Biochemistry, Elsevier, 2007, 40 (2), pp.487-494. 〈10.1016/j.soilbio.2007.09.011〉</source>
<identifier>DOI : 10.1016/j.soilbio.2007.09.011</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.soilbio.2007.09.011</relation>
<language>en</language>
<subject lang=it>EPERUA FALCATA</subject>
<subject lang=it>DICORYNIA GUIANENSIS</subject>
<subject lang=it>SOIL</subject>
<subject lang=it>LITTER</subject>
<subject lang=it>NITRATE</subject>
<subject lang=it>NITRIFICATION</subject>
<subject lang=it>TREE ROOTING</subject>
<subject lang=it>15N</subject>
<subject lang=it>TROPICAL FOREST</subject>
<subject>[SDV.SA.SDS] Life Sciences [q-bio]/Agricultural sciences/Soil study</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Previous studies in lowland tropical rainforests of French Guiana showed that, among non-N2-fixing trees, two groups of late successional species contrasting in their leaf 15N natural abundance coexist, suggesting two different main ways of nitrogen acquisition. Two abundant late-successional species typically co-occurring in rainforests in French Guiana, namely Eperua falcata and Dicorynia guianensis, were chosen as representative of each group. Stable isotope techniques and measurements of potentials of microbial N transformation were performed to assess to what extent leaf 15N natural abundance of these species could be related to (i) d15N signatures of soil mineral N sources and (ii) the capacity of soil to express nitrification and denitrification (both processes being directly involved in the balance between NH4 + and NO3 - ). Soil d15N-NH4 + was roughly similar to leaf d15N of D. guianensis (around 3.5%), suggesting a preferential use of NH4 +, whereas in E. falcata, leaf d15N values were closer to root d15N-NO3 _ values (0.2 and _2.0%, respectively), suggesting a preferential use of NO3 _. These differences in N source utilization were not accompanied by differences in availability in soil NO3 _ or in intensity of microbial functions responsible for soil N mineral evolution. However, (i) under both tree species, these functions showed clear spatial partitioning, with denitrification occurring potentially in soil and nitrification in the litter layer, and (ii) E. falcata fine roots colonized the litter layer much more strongly than D. guianensis fine roots. This strongly suggests that (i) the contrasted leaf d15N values found in the two late-successional species reveal distinct N acquisition strategies and (ii) the ability of roots to predominantly exploit the litter layer (E. falcata) or the soil (D. guianensis) may constitute an important explanation of the observed differences. A complementarity between tree species, based on mineral N resource partitioning (itself resulting from a spatially structured location of the microbial functions responsible for the balance between NH4 + and NO3 - ), can thus be supposed.</description>
<date>2007</date>
</dc>
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