Biomass and primary-production of herbaceous plant communities in the Amazon floodplain |
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Authors: | Wolfgang J Junk Maria Tereza F Piedade |
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Institution: | (1) Max-Planck-Institut für Limnologie, Arbeitsgruppe Tropenökologie, 2320 Plön, Postfac 165, Germany;(2) Instituto Nacional de Pesquisas da Amazônia (INPA), 69.000 Manaus, c.p. 478 Amazonas, Brazil |
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Abstract: | The increase in biomass of different aquatic and terrestrial herbaceous plant communities was measured during various growth periods in the Amazon floodplain near Manaus. Maximum biomass varied from 4–11.2 t ha–1 dry weight in mixed annual terrestrial communities to 6–23 t ha–1 in aquatic annual species (Paspalum repens, Oryza perennis, Luziola spruceana and Hymenachne amplexicaulis) and 15.6–57.6 t ha–1 in communities of the perennial species Paspalum fasciculatum. Cumulative biomass of 3 successively growing annual species reached 30 t ha–1 a–1. Net primary production is considerably higher than maximum biomass. Paspalum fasciculatum reached 70 t during a growth period of 8 months. If one considers for annual species a monthly loss of 10–25% of the biomass, then net primary production in areas with three successive macrophyte communities and a cumulative maximum biomass of 30 t ha–1 is estimated to reach up to 50 t ha–1 a–1. Annual P/B ratio may reach about 3. |
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Keywords: | biomass primary production herbaceous plants Amazonia floodplains |
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