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GeoJournal

, Volume 19, Issue 4, pp 391–397 | Cite as

Biogeochemistry of the Madeira river basin

  • Mortatti J. 
  • Ferreira J. R. 
  • Martinelli L. A. 
  • Victoria R. L. 
  • Tancredi A. C. F. 
Tropical Rainforest

Abstract

A biogeochemical characterization of the Madeira river basin has been made to evaluate the local and global effects of possible alterations in the ecosystem caused by recent intensive occupation in Rondonia state. During the period April 1983—January 1986, sampling was made both by land and river along the tributaries and main channel of the Madeira river. The parameters analysed lead to a detailed study of the physicochemical quality of the waters of the basin and their relationship with the local geology, associated with the transport of solid material and the hydrological behavior of the ecosystem.

Penman's method adapted to tropical rainforest conditions was used to evaluate the potential evapotranspiration for the basin. Estimated potential evapotranspiration was 1420 mm/y, 77% due to the energy balance. Real evapotranspiration was 94% of the estimated potential and the main residence time of the rain water in the basin was 2 months. The isotopic behavior of Hydrogen and Oxygen in the river waters of the region was typical of great rivers, the values being more positive during the dry season and more negative during the rainy season. An isotopic gradient of δ 18O 0.038 (‰)/100 km, was established from Porto Velho station to the estuary, which was considered low when compared with the value of 0.063 (‰)/100 km, obtained for the Amazon river.

In general, the waters of the tributaries were poor in dissolved ion species when compared with the main channel of the Madeira river. Seasonal variation in the transport of suspended sediment kept the same pattern, greater transport being observed on rising water than during high water. A transport of 2.85 million tons per day was observed in the Madeira river near the mouth.

Keywords

Suspended Sediment Main Channel Potential Evapotranspiration Tropical Rainforest Local Geology 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Mortatti J. 
    • 1
  • Ferreira J. R. 
    • 2
  • Martinelli L. A. 
    • 3
  • Victoria R. L. 
    • 4
  • Tancredi A. C. F. 
    • 5
  1. 1.Centro de Energia Nuclear na AgriculturaUniversidade de São PauloBrasil
  2. 2.Secretaria da AgriculturaInstituto de PescaSão PauloBrasil
  3. 3.Centro de Energia Nuclear na AgriculturaUniversidade de São PauloSão PauloBrasil
  4. 4.Escola Superior de Agricultura Luiz de QueirozUniversidade de São PauloBrasil
  5. 5.Instituto Nacional de Pesquisa da AmazoniaManausBrasil

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