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Hydrobiologia

, Volume 91, Issue 1, pp 341–353 | Cite as

Particle size distribution and chemical parameters of the sediments of a shallow turbid impoundment

  • P. C. Keulder
Article
  • 46 Downloads

Abstract

As part of an ecosystem study of a small mesotrophic turbid impoundment in the semi-arid part of South Africa, an investigation was made of the particle size distribution, organic content and inorganic chemical composition of the sediment. Nine transects 50 m apart were made during February 1980. Sediments were sampled with an Eckman grab. The following analyses were made: size fractionation by wet sieving, cation exchange capacity, exchangeable Na, K, Ca, Mg and PO4, total P, and loss on ignition.

From the results it was clear that the finer particles, in or near the original river bed, had higher cation exchange capacity, total P, exchangeable phosphorus and organic content. Littoral areas with avian habitat and extensive macrophyte vegetation, contained coarser sediments. Organic detritus apparently migrated to the deeper part of the impoundment. Sediments of lacustrine and fluvial origin were identified by means of the Passega classification.

Keywords

Impoundment sediments particle size major ions nutrients cation exchange 

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Copyright information

© Dr W. Junk Publishers 1982

Authors and Affiliations

  • P. C. Keulder
    • 1
  1. 1.Department of BotanyUniversity of the Orange Free StateBloemfonteinRepublic of South Africa

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