The relationships between tree density and indices of pasture and soil condition were examined in Western Transvaal grasslands where Acacia karroo had increased following disturbance. The correlation between tree density and pasture condition was not linear, indicating a threshold in condition below which dramatic increase in trees is likely. Some evidence is presented for a second threshold where soil compaction inhibits seedling establishment and tree density declines. The necessity for assessing tree and soil status in addition to pasture condition is discussed and a variety of possible indicators of pasture, woody plant and soil status is considered.
Journal articles from the Grassland Society of Southern Africa (GSSA) African Journal of Range and Forage Science as well as related articles and reports from throughout the southern African region.