Individual study: Recovery rate of depleted ponderosa pine Pinus ponderosa-rough fescue Festuca scabrella grassland sites protected from livestock grazing, southern British Columbia, Canada
McLean A. & Tisdale E.W. (1972) Recovery rate of depleted range sites under protection from grazing. Journal of Range Management, 25, 178-184
In the North American Pacific Northwest, information on the number of years rest necessary for recovery of ‘depleted’ rangelands due to livestock grazing was lacking. This study attempted to evaluate effects of livestock exclusion on depleted (overgrazed) ranges by assessing vegetation changes in four exclosures in the ponderosa pine Pinus ponderosa zone and three on rough fescue Festuca scabrella grasslands in southern British Columbia, Canada.
Within exclosures considered of poor condition at time of exclosure, little change in plant composition occurred from 1959-1969. It took longer for these sites to progress to fair condition, than for those in fair condition at the outset to recover to good condition. The main plants to increase through livestock exclusion were two grasses, bluebunch wheatgrass Agropyron spicutum (Pseudoroegneria spicata) and rough fescue. The main species to decrease were Sandberg bluegrass Poa secunda, low pussytoes Antennaria dimorpha and grey rabbitbrush Chrysothamnus nauseosus.