Productivity, Biomass, and Population Dynamics in Amazonian Water Bodies

Fittkau, Ernst Josef; Irmler, Ulrich; Junk, Wolfgang J.; Reiss, Friedrich; Schmidt, Gottfried W.

doi:10.1007/978-3-642-88533-4_20

Cited by 78 publications

(44 citation statements)

References 5 publications

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“…It is perhaps also due to low levels of atmospheric deposition as a consequence of the prevailing northeast and southeast trade winds passing forested areas, and the substantial water vapour recycling within the Amazon'basin (Salati 1985). The belief that the western peripheral region of the Amazon basin would be less oligotrophic than central Amazonia, which is largely based on limnological studies and the presence of less preweathered parent materials (Fittkau et al 1975;Irion 1976;Sombroek 1984;Moura and Kroonenberg 1988;Richter and Babbar 1991), seems not to accord with the tight nutrient cycling observed in the upland forest plots.…”

Section: Seasonalitymentioning

confidence: 99%

Fine litter input to terrestrial humus forms in Colombian Amazonia

Lips

Duivenvoorden

1996

Oecologia

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A comparative litter fall study was made in five rain forest stands along a gradient of humus form development and soils in the Amazon lowlands of eastern Colombia. The total fine litter fall was highest in a plot on a well drained soil of the flood plain of the Caquetfi River (1.07 kg • m -2 • y-l), lower in three plots on well drained upland soils (0.86, 0.69, and 0.68 kg • m -2 • y-l), and lowest in a plot on a poorly drained, upland podzolised soil (0.62 kg • m -2 • y-l). In the four upland plots, leaf litter fall patterns were highly associated, which points at climatic regulation. Litter resource quality, as represented by nutrient concentrations and area/weight ratio of the leaf litter fall, was comparatively high in the flood plain plot. In the upland plots, concentrations and fluxes of Ca, Mg, K, and P were as low as in oligotrophic central Amazonian upland forests. This questions generalisations that the western peripheral region of the Amazon basin should be less oligotrophic than central Amazonia. The upland plot on the podzolised soil showed the lowest concentrations and fluxes of N. Mean residence times of organic matter and nutrients in the L horizons hardly differed between the five plots, suggesting that edaphic properties and litter resource quality are of little importance in the first step of decomposition. Mean residence time of organic matter in all ectorganic horizons combined (estimated on the basis of litter input and necromass on the forest floor, and uncorrected for dead fine root input) varied from 1.0 y in the flood plain forest, 1.1-3.

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Section: Seasonalitymentioning

confidence: 99%

Fine litter input to terrestrial humus forms in Colombian Amazonia

Lips

Duivenvoorden

1996

Oecologia

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“…Although this has been described in qualitative terms (Fittkau et al 1975), there are no quantitative descriptions of the extent of the river water invasion during the rainy season or of the subsequent dry season drainage of this water back into the river. Phytoplanktonic algae and marginal vegetation are likely to be influenced by the annual flooding, and in turn may exert an impact on dissolved nutrient concentrations in the river.…”

mentioning

confidence: 99%

Amazon lakes: Water storage and nutrient stripping by algae1

Fisher

Parsley

1979

Limnology & Oceanography

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During the annual 10‐m rise in water level, water from the Amazon River floods into bordering nutrient‐poor lakes, and river‐derived nitrate (12 µM) and phosphate (0.9 µM) are utilized during intense phytoplankton growth. The influence of the nutrient‐rich water appears to extend laterally in a 50‐km band, creating a ribbon of highly pro ductive lakes along its length that, in turn, may have a significant impact on Amazon water chemistry.

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“…The study was conducted in three areas: One located in municipality of Novo Aripuanã (17-year-old culture-C17), and the other two in the municipality of Maués (10 and 12 year old culture-C10 and C12, respectively), both in the state of Amazonas, Brazil (Figure 1), Central Amazonia [44]. The climate of Novo Aripuanã is also classified as type Af, hot and humid according to Küppen-Geiger, with an annual average rainfall of 2444 mm and an annual mean temperature of 26.9 • C [45,46] The soils of the region are predominantly classified as yellow poor oxisols saturated by oxidized iron and aluminum with low pH [47].…”

Section: Study Sites Descripionsmentioning

confidence: 99%

Sequential Management of Commercial Rosewood (Aniba rosaeodora Ducke) Plantations in Central Amazonia: Seeking Sustainable Models for Essential Oil Production

Krainovic

Almeida

Desconci

et al. 2017

Forests

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Rosewood (Aniba rosaeodora Ducke) is an endangered tree that produces essential oil of high commercial value. However, technical-scientific knowledge about cultivation is scarce and studies are needed to examine the management viability. The current study evaluated rosewood aboveground biomass management, measuring the export of nutrients resulting from harvesting and testing sustainable management models. The crown of 36 rosewood trees were pruned and 108 trees cut at 50 cm above the soil in two regions in Central Amazonia. Post-harvest performance of sprouting shoots was evaluated and after, sprouting shoots were pruned so that the development of two, three and all shoots was permitted. Nutrient stock estimation was calculated as the product of mass and nutrient concentration, which allowed nutritional replacement to be estimated. The pruning facilitates regrowth by 40.11% of the initial mass while by cut regrow 1.45%. Chemical attributes of regrowth biomass differed significantly prior to management and regrowth had a significant correlation with the reserves in root tissues and with the pre -management status of the individual tree. Driving sprouts resulted in significantly larger growth increments and may provide a form of management that can viably be adopted. Biomass sequential management resulted in high nutrient exports and the amount of fertilizer needed for replenishment depended on the intensity and frequency of cropping. Compared with the cut of the tree, pruning the canopy reduces fertilizers that are required to replenish amount by 44%, decreasing to 26.37% in the second rotation. The generated knowledge contributes to this silvicultural practice as it becomes ecologically and economically viable.

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Productivity, Biomass, and Population Dynamics in Amazonian Water Bodies

Cited by 78 publications

References 5 publications

Fine litter input to terrestrial humus forms in Colombian Amazonia

Fine litter input to terrestrial humus forms in Colombian Amazonia

Amazon lakes: Water storage and nutrient stripping by algae1

Sequential Management of Commercial Rosewood (Aniba rosaeodora Ducke) Plantations in Central Amazonia: Seeking Sustainable Models for Essential Oil Production

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