Biomass and primary-production of herbaceous plant communities in the Amazon floodplain
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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.
Key wordsbiomass primary production herbaceous plants Amazonia floodplains
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