Four distance-measurement techniques were tested in 1969 near the Craigieburn Research Station of the Forest and Range Experiment Station, New Zealand Forest Service. Two methods (closest individual and point-centered-quarter) are known to result in biased estimates of density in nonrandom plant populations, and the other two methods (angle-order and corrected-point-distance) have been reported to permit unbiased estimates in nonrandom populations. Sampled were two tussock grassland species in areas where true densities were determined by total counts. The corrected-point-distance method resulted in estimates within 20% of actual density for all populations, and appeared to be the most promising measurement method tested. The closest individual and point-centered-quarter methods gave badly biased (low) estimates of aggregated populations. Reasonably good estimates for some populations were obtained by the angle-order method, but it is time consuming. All methods appear to need additional theoretical work. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.