Structure, above-ground biomass and dynamics of mangrove ecosystems: new data from French Guiana |
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Authors: | F Fromard H Puig E Mougin G Marty J L Betoulle L Cadamuro |
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Institution: | (1) Laboratoire d'Ecologie Terrestre, Unité Mixte de Recherche CNRS-UPS, 13 avenue du Colonel Roche, BP 4403-31405 Toulouse cedex, France Fax 33 5 61 55 85 44; e-mail: fromard@cesbio.cict.fr, FR;(2) Centre d'Etude Spatiale de la Biosphère, CNRS-UPS-CNES, Toulouse, France, FR |
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Abstract: | The article presents new results on the structure and the above-ground biomass of the various population types of mangroves
in French Guiana. Nine mangrove stands were studied, each composed of three to ten adjoining plots with areas that varied
depending on the density of the populations. Structural parameters and indices were calculated. Individuals representative
of the three groups of taxa present were felled:Avicennia germinans (L) Stearn, Rhizophora spp., and Laguncularia racemosa (L) Gaertn. The trunks, branches and leaves were sorted and weighed separately. The biomass was obtained by determining the
allometric relationships, the general equation selected being of the type y = a
o
x
a1, where the diameter (x) is the predictive variable. The total above-ground biomass varied from 31 t ha−1 for the pioneer stages to 315 t ha−1 for mature coastal mangroves, but with large variations depending on the structural characteristics at each site. The results
place the Guianese mangroves among those with high biomass, although lower than those reported for Asia. Based on the relationships
between structural parameters and standing biomass, in particular with the use of the “self-thinning rule”, population dynamics
models are proposed.
Received: 16 August 1996 / Accepted 17 January 1998 |
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Keywords: | Mangroves Structure Biomass Allometric relationships Self-thinning rule |
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