The organic content of the surficial sediment: a method for the study of ecosystems development in abandoned river channels |
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Authors: | J. C. Rostan C. Amoros J. Juget |
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Affiliation: | (1) Programme Interdisciplinaire de Recherches sur l'Environnement (CNRS), Département de Biologie Animale et Ecologie (U.A. CNRS 367), 69622 Villeurbanne Cedex, France |
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Abstract: | To characterise different abandoned river channels, a simple index of the surface sediment was developed i.e. the content of organic matter (expressed as C × N) plotted in relation to that of CaCO3. The age of the channels studied ranges from 20 to 300 years. Some of them still contain water; others are silted up. Two types are distinguished. The ecosystems of the first one are closed and show a slow rate of development governed by autogenous processes. Those of the second type are more open and show a fast rate of development mainly controlled by allogenous processes. These distinctions are used in a diagrammatic model of the dynamics of Rhône River alluvial plain to be used in fundamental or applied future research. |
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Keywords: | river system alluvial plain ecological successions organic matter organic sediment index |
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