• Infiltration Rates of Various Vegetative Communities within the Blue Mountains of Oregon

      Gaither, R. E.; Buckhouse, J. C. (Society for Range Management, 1983-01-01)
      Mean infiltration rates differed among several natural vegetation communities with ponderosa pine (Pinus ponderosa) exhibiting the lowest mean infiltration rate of 6.0 cm/hr and larch (Larix occidentalis) demonstrating the highest at 8.8 cm/hr. A trend toward increasing infiltration rates corresponded to increasingly mesic sites. Alpine, Douglas fir (Psuedotsuga menziesii), mountain meadow, and larch types demonstrated the greatest vegetative cover, occupied the most mesic sites, and exhibited the highest infiltration rates. Infiltration differences within vegetative communities based upon changes in condition and productivity were also noted. The forested sites were more dependent upon condition class than productivity class, with higher infiltration rates being exhibited on pole sites than on timbered sites, apparently in response to higher plant densities associated with the pole thickets. Nonforested sites were responsive to both productivity and condition class with higher infiltration rates being exhibited on these sites with the more productive or better condition classifications.
    • Response of Forage Species Seeded for Mule Deer in Western Juniper Types of South-central Oregon

      Leckenby, D. A.; Toweill, D. E. (Society for Range Management, 1983-01-01)
      Mule deer and livestock forage supplies were increased by seeding 11 species of grasses, forbs, and shrubs within chained and nonchained western juniper thermal cover stands in south-central Oregon. Standard crested wheatgrass and Siberian wheatgrass were the only species that established in significant amounts. Wheatgrass densities were greater in chain-drill treatments than in drill-only treatments. Among all experimental units, differences in emergence and establishment (plants/m2) were greater than were differences in seeding rates (viable seeds/m2). Standard crested wheatgrass density exceeded that of Siberian wheatgrass over both treatments and six pretreatment vegetation subtypes. Emergence of seedlings and establishment of wheatgrass were all significantly related to subtype. The chain-drill treatment produced more spring forage than did the drill-only treatment. Neither treatment provided more winter forage.