• Aspen Invasion in a Portion of the Alberta Parklands

      Bailey, A. W.; Wroe, R. A. (Society for Range Management, 1974-07-01)
      Brush areas on ranges in the parkland region of southcentral Alberta have increased from 4.8 to 8.0% of the land area between 1907 and 1966. The invasion was not constant each year, but was concentrated in two major periods between 1937 and 1970. Annual herbage production under aspen and willow was reduced by 80 to 90% when compared with the production of adjacent rough fescue grassland. The invasion of aspen into grasslands was correlated with high temperatures, particularly during the month of June, 1 and 2 years before tree establishment and with low precipitation 2 years prior to establishment.
    • A Simple Field Technique for Identification of Some Sagebrush Taxa

      Stevens, R.; McArthur, E. D. (Society for Range Management, 1974-07-01)
      A technique has been developed that provides an on-the-spot field test to aid in identification of some sagebrush taxa. Seeds, dried or green crushed leaf material, or stem cambium of various sagebrush taxa will produce distinctive shades of blue when wet and placed under longwave ultraviolet light. The technique is particularly helpful in separation of Artemisia tridentata subsp. tridentata from A. tridentata subsp. vaseyana. Subspecies vaseyana extracts are blue, whereas those of subsp. tridentata are not. All taxa producing blue water extracts are preferred by mule deer.
    • A Mobile Infiltrometer for Use on Rangeland

      Blackburn, W. H.; Meeuwig, R. O.; Skau, C. M. (Society for Range Management, 1974-07-01)
      The mobile drip type infiltrometer described in this note is easily constructed and simple to operate on rangelands accessible by truck.
    • A Double Sampling Technique for Estimating Dietary Composition

      Peden, D. G.; Hansen, R. M.; Rice, R. W.; Van Dyne G. M. (Society for Range Management, 1974-07-01)
      A double sampling technique is described which has a potential to increase sampling accuracy and efficiency when estimating botanical composition of herbivore diets. When applied to wild herbivores this technique may also reduce the need for using fistulated and thus behaviorally abnormal animals.