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| Brinkmann,W. L. F.. |
| Abstract Light intensity above the groundstoreys (120 cm) and inbetween the ground strata of a Riverine forest, a Carrasco forest and a terra firme Rain forest was recorded through two day periods of time in the rain season (April/May) and the dry season (August) of 1969. Measurements were undertaken between 6 a.m. and 18 p.m. in minute by minute intervals (51.840 readings). The relative frequency of light intensity was computed for seven intensity classes and three periods of time per day. The spectral composition of light was determined as relative frequency of light intensities for five filter ranges of wavelengths, seven intensity classes and three periods of time per day. The riverine forest (best light conditions for the undertorey plant communities)... |
| Ano: 1971 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671971000200037 |
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| Matsui,E.; Salati,E.; Brinkmann,W. L. F.; Friedman,I.. |
| Sinopse Foram encontradas concentrações isotopicas diferentes nas águas do Rio Negro e do Rio Solimões. Partindo daquela verificação preliminar, foi feita a amostragem sistemática de águas daqueles dois rios e do rio Amazonas, procurando-se determinar abaixo da confluência dos mesmos, o local onde o rio Amazonas apresenta uma estrutura horizontal e vertical homogênea traduzindo perfeita mistura das águas dos rios formadores. Os dados obtidos permitem também o cálculo, com razoável precisão, da vasão relativa de ambos os rios para alguns meses. Verificou-se que a 120 Km da confluência do Negro e o Solimões, ainda não havia mistura perfeita e que abaixo daquele ponto, a confluência do Madeira introduz perturbações na mistura. O grau de mistura em diferentes... |
| Ano: 1972 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671972000300031 |
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| Brinkmann,W. L. F.; Ribeiro,M. N. Góes. |
| Abstract Air temperatures under cold front conditions were recorded on July 10th 1969 inside and outside a secondary forest at Ducke Forest Reserve Air temperatures were measured at 2 towers and 8 corresponding levels ranging from 10 cm to 900 cm height. The absolute daily minimum air temperature recorded was 11.0°C, which is exceptionally low for Central Amazonia and 16.0°C below the yearly average air temperature at Manaus measured over a 45-year period of temperature records. The maximum 30-min range of air temperature was observed in the clearing (8.1°C), 7 meters above the ground. The strongest impact of air temperatures in the forest stand was recorded in the canopy area and in the ground stratum due to the formation of cold air cells and cold air... |
| Ano: 1972 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671972000300025 |
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| Brinkmann,W. L. F.; Santos,A. dos. |
| Abstract The principle sources of the calcium found in the water of the tertiary Amazonian region near Manaus, are the water running over the tree trunks and the total forest water. The soluble calcium content must come from the rain washing the tree crowns, stems, and leaves, and to a certain point from the dissolution of metabolic products of macro and micro-organisms. Generally, only traces of calcium are found in rain water, soil, and river water. Therefore, calcium can be considered as an element circulating in a closed system. Altogether the calcium content in the natural water of the tertiary Amazon region is extremely low. |
| Ano: 1973 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671973000200033 |
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| Brinkmann,W. L. F.; Nascimento,J. C. do. |
| SUMMARY The slash and burn method was studied with respect to changes on the chemical composition in the top-soil layer (upper 20 cm) of yellow latosols (about 85% of the total area) and hydromorphic soils (about 1% of the total area) before and after fire was set on the cleared forest. The obtained analytical data prove the following result : 1) the soil fertility of latosols and hydromorphic soils is considerably low as far as natural conditions are concerned, 2) after burning a considerable amount of plant nutrients normally bound to the standing crop is lost in the form of volatiles and particles during the burning procedures, 3) a great amount of plant nutrients is rapidly released to the soil after burning, 4) great quantities of temporarily... |
| Ano: 1973 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671973000100055 |
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| Brinkmann,W. L. F.. |
| Abstract: Spherical ceramic bulbs were set up as weekly water-loss integrators on a clearing and below a 2 year-old Cecropia-commumty at Km 18 of the Manaus-Itacoatiara Road. The instruments worked well in distinguishing the particular responses of individual sites to the impact of atmospheric agents as solar radiation, air temperature, air humidity and wind. Water-loss was primarily dependent on the order of magnitude of the weekly total of solar radiation and the presence or lack of a standing crop. Already a scarce secondary growth will reduce the weekly amount of water lost to the atmosphere considerably. Shelter-wood, however, considering the crop specific demands if introduced to tropical agriculture would provide favourable conditions as far as the... |
| Ano: 1972 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671972000100033 |
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