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Acta Amazonica

Print version ISSN 0044-5967On-line version ISSN 1809-4392

Acta Amaz. vol.2 no.1 Manaus Apr. 1972

http://dx.doi.org/10.1590/1809-43921972021033 

CIÊNCIAS DO AMBIENTE

Weekly water-loss from Spherical Water-loss Integrators on a Clearing and below Secondary Growth in Central Amazonia (*)

W. L. F. Brinkmann1 

1 Instituto Nacional de Pesquisas da Amazônia

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 impact of atmospheric controls on the tropical environment are concerned.

Resumo

Bulbos esféricos de cerâmica foram instalados numa clareira, sob uma comunidade de Cecropia de dois anos, no Km 18 da Estrada Manaus-Itacoatiara. Os instrumentos funcionaram satisfatoriamente como integradores da perda semanal de água permitindo distinguir as respostas de sitios individualizados ao impacto de agentes atmosféricos como a radiação solar, temperatura do ar, umidade do ar e ventos. A perda d'água dependeu primariamente da ordem de grandeza da radiação solar total durante a semana e da presença ou ausência de vegetação. Um ralo crescimento secundário já é suficiente para reduzir consideravelmente a perda semanal de água. Árvores de sombra, consideradas as exigências especificas, se introduzidas na agricultura tropical, poderiam proporcionar condições favoráveis para o controle do impacto dos fatores atmosféricos.

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*— Forestry Research Program, INPA. This Program is supported by the Conselho Nacional de Pesquisas and the Banco Nacional de Desenvolvimento Econômico (FUNTEC).

Creative Commons License  This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.