• Evolution of Grazing and Land Tenure Policies on Public Lands

      Borman, Michael M.; Johnson, Douglas E. (Society for Range Management, 1990-08-01)
    • Evolution of Multiple Natural Resource Management in the Range Profession

      Bredemeier, Lorenz F. (Society for Range Management, 1989-12-01)
    • Evolutionary Implications for Grazing Management Systems

      Platou, Karen A.; Tueller, Paul T. (Society for Range Management, 1985-04-01)
    • Evolving Views of Public Land Values and Management of Natural Resources

      Quigley, Thomas M. (Society for Range Management, 2005-06-01)
    • Examination of fire-related succession within the dry mixed-grass subregion of alberta with the use of MODIS and Landsat

      Smith, B.; McDermid, G. J. (Society for Range Management, 2014-05)
      Fire is an important disturbance process historically present across the northern Great Plains. Previous research from northern dry mixed-grass prairie suggests that C4 (warm season) grasses replace C3 (cool season) climax species with increasing fire, particularly in the spring. This hypothesis was tested at a landscape scale at Canadian Forces Base Suffield Alberta, by exploring the relationship between ecosystem states (C3 dominant, C3/C4 codominant, C4 dominant) inferred from a MODIS multitemporal plant functional type classification (pseudo R2: 0.598, overall accuracy: 0.74) and interyear fire history digitized from the Landsat archive (1972-2007). Probit regression showed that succession processes were different between range sites, where C4-dominant pixels were positively related to fire (P<0.001, pseudo R2=1) and completely replaced C3-dominant pixels on loamy range sites after 14 fires in 36 yr. In contrast, C3- and C3/C4-codominant pixels were related with fire on Blowouts range sites (P<0.001, pseudo R2=1), where C3/C4-codominant pixels replaced C3-dominant pixels with increasing fire. Finally, there were no statistically significant relationships between ecosystem states and fire for Sands range sites. Analysis of recovery showed that after loamy pixels experienced three to six fires in 18 yr followed by 18 yr of rest, C3-dominant pixels were reduced by over 30% compared to unburned pixels. Finally, intrayear fire timing (2001-2009) was explored with the use of Wilcoxon signed-rank tests between the spatial extent of spring and summer fires, with the use of MODIS burned-Area data. Results indicate that fires are not limited to the spring season (P<0.05), but occur across the entire growing season. Although fire timing does not appear to play a role in driving succession, this ecosystem is generally sensitive to repeated fire, with recovery of C3 climax species taking decades.
    • Examination of Methods for Estimating Rate of Passage in Grazing Steers

      Cochran, R. C.; Adams, D. C.; Galyean, M. L.; Wallace, J. D. (Society for Range Management, 1987-03-01)
      Understanding how rate of passage estimates are influenced by procedural variations may facilitate standardization of methodology and enhance comparisons among studies. Therefore, 12 ruminal-fistulated beef steers (mean wt. = 294 kg) were used in two 6-day grazing trials to evaluate influences of sampling site, intraruminal mixing, and mathematical model on particle passage rate estimates. Steers grazed a 13-ha pasture of immature crested wheatgrass. We estimated particle passage rate from the rumen by intraruminal administration of a pulse dose of Yb-labeled forage followed by serial collection of ruminal digesta or fecal samples. Treatments were (1) rectal sampling; (2) ruminal sampling-ruminal contents mixed before subsampling digesta; (3) ruminal sampling-ruminal contents not mixed before subsampling digesta. All steers were fitted with vibracorders to monitor grazing time before and during sampling periods. Fecal Yb curves were fitted with a one compartment, time-dependent (ICMPT-TD), a two-compartment, sequential time-dependent-time-independent (2CMPT-TD), and a two-compartment, time-independent (2CMPT-TI) model. All ruminal Yb curves were fitted with a single exponential decay model. Comparisons among models were limited to rate constants associated with the slower escape process. Intraruminal mixing did not alter (P>0.10) passage rates. The 2CMPT-TD model failed to fit some fecal profiles. Particle passage rates from the 2CMPT-TI model were greater (P<0.05) than those from the ICMPT-TD model. Similarity among passage rate constants derived from fecal Yb curves and those derived by semilogarithmic regression of ruminal Yb concentration on time depended on the model used to fit fecal Yb curves. Grazing time decreased (P<0.01) during intensive sampling periods. We conclude that for steers grazing immature grass pastures, intraruminal mixing before subsampling does not significantly alter rate of passage estimates; however, site of sampling and mathematical model may be important factors to consider in choosing appropriate methodology for estimating rate of passage.
    • Exciting Changes in SRM Publications

      Kothmann, Mort (Society for Range Management, 2005-02-01)
      Exciting changes in SRM publications.
    • Exclosures in Big Game Management in Utah

      Young, S. (Society for Range Management, 1958-07-01)
    • Exclosures on the Beaver Dam Slope in Arizona and Utah

      Anderson, Julian L. (Society for Range Management, 1994-10-01)
    • Executive Vice-President’s Comments

      Whittekiend, J. C. (Society for Range Management, 1998-06-01)
    • Executive Vice-President’s Report

      Rumburg, Charles (Society for Range Management, 1997-06-01)
    • Exotic and Invasive Herbaceous Range Weeds

      Young, James A.; Clements, Charlie D. (Society for Range Management, 2005-10-01)
    • Exotic Big Game: A Controversial Resource

      Demarais, Stephen; Osborn, David A.; Jackley, James J. (Society for Range Management, 1990-04-01)
    • Exotic Plant Species Diversity: Influence of Roads and Prescribed Fire in Arizona Ponderosa Pine Forests

      Fowler, James F.; Sieg, Carolyn Hull; Dickson, Brett G.; Saab, Victoria (Society for Range Management, 2008-05-01)
      Many studies have investigated the ecological effects of roads and roadsides as both habitat and dispersal corridors for exotic plant species. Several of these compared roadside exotic species richness and abundance with adjacent interior habitats, but we found no studies of individual exotic species’ abundance between the two habitats in the context of prescribed fire. We measured exotic species richness and individual species’ abundance along roadsides and in adjacent interior habitat (> 150 m) before and after prescribed fire at three ponderosa pine (Pinus ponderosa Douglas ex Lawson C. Lawson) sites in northern Arizona. Eighteen of the 20 exotic plant species found in this study have been and continue to be intentionally introduced or are known agricultural seed contaminants. Roadsides had significantly higher exotic species richness than adjacent forest interior habitats, but only one site showed a significant (decreasing) fire effect on species richness. Four exotic plant species had significantly higher densities along roadsides at two of the three sites, and four species had no significant difference in abundance between habitats at any site supporting an individualistic species response hypothesis. Most exotic species showed no significant change in density post-prescribed fire suggesting that low-intensity prescribed fire may have minimal effect on exotic species diversity. Variability in total exotic species richness, composition, species’ constancies, and species’ densities between the three regionally similar sites suggests differing degrees and effectiveness of past management practices and policies such as intentional seeding. 
    • Exotics—At Home on the Range in Texas

      Nelle, Steve (Society for Range Management, 1992-04-01)
    • Expanding Horizons in Worldwide Range Management

      Pearse, C. K. (Society for Range Management, 1966-11-01)
      Range management must play an increasingly important role in the efforts of the developing countries to increase their output of livestock products. Technical assistance to guide improvement in the management and use of range and pasture resources can best be provided by international organizations. It is essential to establish a philosophy of range management based on sound ecological principles and shared by a body of dedicated range specialists in each of the countries. Gaining acceptance of such a doctrine, and building up such a body of specialists, then becomes the real objective of technical assistance in range management.
    • Expected-Use GIS maps

      Guenther, Keith S.; Guenther, Glen E.; Redick, Peggy S. (Society for Range Management, 2000-04-01)
    • Experiences on Misson Creek Angus Ranch

      Hays, Anita (Society for Range Management, 1982-10-01)
    • Experiences with 2,4-D Spraying on the Lassen National Forest

      Hormay, A. L.; Alberico, F. J.; Lord, P. B. (Society for Range Management, 1962-11-01)