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Campo DC | Valor | Idioma |
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dc.contributor.author | Piedade, Maria Teresa Fernandez | - |
dc.contributor.author | Junk, Wolfgang Johannes | - |
dc.contributor.author | Long, Stephen Patrick | - |
dc.date.accessioned | 2020-06-15T22:07:47Z | - |
dc.date.available | 2020-06-15T22:07:47Z | - |
dc.date.issued | 1997 | - |
dc.identifier.uri | https://repositorio.inpa.gov.br/handle/1/19360 | - |
dc.description.abstract | 1. Echinochloa polystachya forms extensive monotypic stands on the lower levels of the Amazon floodplains. During its annual growth cycle c. 100t (dry mass) ha-1 of biomass is formed as the floodplain is being submerged (December-September) and a phase of death and decomposition occurs when the water has retreated (October-November). This study examines the mineral nutrient dynamics of this plant and its potential significance to the nutrient status of the floodplain. 2. Echinochloa polystachya was sampled monthly from a study site in the central Amazon. N, P and K contents for different plant organs were determined and net uptake calculated from concurrent measurements of dry matter production and turnover. 3. Leaf N, P and K contents were c. 20, 1.7 and 19 g kg-1, values typical of nutrient-replete stands of C4 plants. Stem concentrations were c. 12% of those of the leaves. Net N and P uptake followed the rise in the river level, whilst K appeared independent of water level. 4. The vegetation accumulated 377, 51 and 1136 kg ha-2 of N, P and K, respectively, during the growth phase. Over a possible 5000 km2 of these stands in the Varzea, this represents a massive sequestration of nutrients in the flood phase and a high release during the following low-water period. It is suggested that the E. polystachya stands could have a role in maintaining the nutrient status of the Amazon floodplain. | en |
dc.language.iso | en | pt_BR |
dc.relation.ispartof | Volume 11, Número 1, Pags. 60-65 | pt_BR |
dc.rights | Restrito | * |
dc.subject | Echinochloa Polystachya | en |
dc.subject | Echinochloa Polystachya | en |
dc.subject | Poaceae | en |
dc.subject | Aquatic Macrophyte | en |
dc.subject | Floodplain | en |
dc.subject | Nutrient Dynamics | en |
dc.subject | Brazil, Amazonia | en |
dc.subject | South America, Amazonia | en |
dc.title | Nutrient dynamics of the highly productive C4 macrophyte Echinochloa polystachya on the Amazon floodplain | en |
dc.type | Artigo | pt_BR |
dc.identifier.doi | 10.1046/j.1365-2435.1997.00066.x | - |
dc.publisher.journal | Functional Ecology | pt_BR |
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