SciELO - Scientific Electronic Library Online

 
vol.110 número3-4Impact of lower stratospheric ozone on seasonal prediction systemsAssessment of atmospheric trace metals in the western Bushveld Igneous Complex, South Africa índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Articulo

Indicadores

Links relacionados

  • En proceso de indezaciónCitado por Google
  • En proceso de indezaciónSimilares en Google

Compartir


South African Journal of Science

versión On-line ISSN 1996-7489
versión impresa ISSN 0038-2353

Resumen

TSHEBOENG, Gaolathe; BONYONGO, Mphaphi  y  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.

Palabras clave : flood; communities; soil; vegetation; zones.

        · texto en Inglés     · Inglés ( pdf )

 

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons