Abstract. The scarcity of indigenous trees on the Highveld of eastern South Africa is usually attributed to frost, fire and drainage, regardless of whether the soils are nutrient-poor (sourveld grasslands) or nutrient-rich (sweetveld grasslands). Soil samples were taken along 14 savanna-grassland boundaries. âº A catenal effect was evident. âº In flat sites, grasses prevailed over trees on relatively nutrient-rich subsoils. âº Enriched and impoverished grasslands were sweetveld and sourveld, respectively.
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