Mangrove species zonation and soil redox state, sulphide concentration and salinity in Gazi Bay (Kenya), a preliminary study

  • Matthijs S
  • Tack J
  • van Speybroeck D
 et al. 
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Abstract

The relationship between soil redox state, sulphide concentration,
salinity and spatial patterns of mangrove species distribution was
investigated in the mangrove forest of Gazi Bay (Kenya). Field measurements
were conducted to examine the relationship between species distribution
along a band transect of 280?m and soil redox potential (Eh) and
sulphide patterns, as well as the indirectly related (through flooding
regimes) soil salinity. Of the three major species Avicenniamarina,
Ceriops tagal and Rhizophoramucronata present along the transect,
only the distribution of the latter correlated with the measured
soil variables, R. mucronata being absent from the less-reduced zone
with high salinity. Bruguieragymnorhiza and Heritieralittoralis occur
in minor populations, they are restricted to the saline, sulphide-poor
and less-reduced substrates. From the results it is concluded that
soil redox potential (Eh), sulphide concentration and salinity may
contribute to structure mangroves through the distribution of dominant
species, however in combination with other environmental conditions
and processes of vegetation dynamics.

Author-supplied keywords

  • Avicennia marina
  • Ceriops tagal
  • East Africa
  • Mangal
  • Rhizophora mucronata
  • Spatial structure

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Authors

  • S. Matthijs

  • J. Tack

  • D. van Speybroeck

  • N. Koedam

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