A pilot survey to determine the sampling efficiency of the wheel-point method, using the nearest plant method, to assess species composition (using replicate similarity related to sampling intensity, and total sampling time) was conducted on three plot sizes (20 × 20m, 30 × 30m, 40 × 40m) at two sites in a semi-arid savanna. Total sampling time included the time to demarcate a plot. A 40 × 40m plot had the highest precision and repeatability (number of point observations required to achieve a stated asymptotic value), and was followed by a 20 × 20m plot. These relationships were consistent across sites. A 40 × 40m plot recorded the highest sampling times due to the time required to demarcate a plot. A 20 × 20m plot was the most efficient. A model to assist in making decisions regarding a suitable plot and sample size, and for planning and budgeting of vegetation monitoring programs was developed. Future surveys should include a Monte-Carlo data simulation as an adjunct to data collection.
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.