SciELO - Scientific Electronic Library Online

vol.110 issue3-4Characterisation of South African isolates of Fusarium oxysporum f.sp. cubense from Cavendish bananasSalinity and temperature tolerance of the invasive freshwater gastropod Tarebia granifera author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand



Related links

  • On index processCited by Google
  • On index processSimilars in Google


South African Journal of Science

On-line version ISSN 1996-7489
Print version ISSN 0038-2353


TSHEBOENG, Gaolathe; BONYONGO, Mphaphi  and  MURRAY-HUDSON, Mike. Flood variation and soil nutrient content in floodplain vegetation communities in the Okavango Delta. S. Afr. j. sci. [online]. 2014, vol.110, n.3-4, pp.01-05. ISSN 1996-7489.

We investigated the influence of hydroperiod variation on soil nutrient content in the Okavango Delta seasonal floodplains. Soil samples were collected from eight zones of homogenous vegetation cover after low and high floods and analysed for pH, Na, Mg, Ca, K and P content. A Student's t-test was used to test for differences in pH, Na, Mg, Ca, K and P between soils after low and high floods. The Kruskal-Wallis test was used to compare means of flooding duration and depth between low and high floods. Na, K, Mg, P and pH levels in soils were significantly different (p<0.05) after low floods compared with after high floods. Na content was lower (p<0.05) in Zones 2 and 8 and higher (p<0.05) in Zones 4, 5 and 6 during high flood than during low flood. Ca content was lower (p<0.05) in Zones 1, 2, 3, 4 and 5 and higher in Zone 7 (p<0.05) under high flood than during low flood. Mg content was lower (p<0.05) in Zones 1 and 5 and higher (p<0.05) in Zones 6, 7 and 8 during high flood than during low flood. K content was lower in Zones 1 and 3 and lower in Zones 6, 7 and 8 (p<0.05) during high flood than during low flood. pH was significantly lower and higher after a high flood in Zones 1 and 6, respectively, than during low flood. P content was significantly (p<0.05) higher in all zones after high flood than after low flood. Flooding depth and duration increased (p<0.05) in all vegetation zones during high flood. Our results have direct implications for molapo (flood recession) farming. We recommend that farmers plough immediately after the onset of flood recession when the soil is still moist and rich in nutrients.

Keywords : flood; communities; soil; vegetation; zones.

        · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License