Now showing items 41-60 of 1272

    • An Analysis of Several Alternatives to Oil As an Industrial Fuel 

      Kluender, Richard A.; Reisinger, Thomas W.; Farrar, Kenneth D.; Stuart, William B. (Virginia Tech. Division of Forestry and Wildlife Resources, 1981-10)
      This paper presents an analysis of some significant factors that should be evaluated when considering alternatives to oil burning boilers. Managers contemplating using or increasing the use of wood for energy should find ...
    • Main Stem Green and Dry Weights of Red Oak, White Oak, and Maple In the Appalachian Region of Virginia 

      Oderwald, Richard G.; Yaussy, Daniel A. (Virginia Tech. Division of Forestry and Wildlife Resources, 1980)
      New emphasis has been placed on the weight of whole trees and portions of trees. Weight inventories and purchase of wood by weight are becoming increasingly common for saw logs as well as pulpwood. More information needs ...
    • Evaluation of Ranked Set Sampling for Estimating Shrub Phytomass in Appalachian Oak Forests 

      Martin, Wayne L.; Sharik, Terry L.; Oderwald, Richard G.; Smith, David Wm. (Virginia Tech. Division of Forestry and Wildlife Resources, 1980)
      Ranked set sampling was introduced by McIntyre (1952) in estimating pasture yields. As described by McIntyre, the ranked set sampling procedure is implemented by first selecting a set of n elements at random from a population, ...
    • Costs of Establishing Loblolly Pine Plantations In Virginia: Methodology and Estimates 

      Thompson, Emmett F.; Shores, Michael E.; Sullivan, Alfred D. (Virginia Tech. Division of Forestry and Wildlife Resources, 1973-02)
      Forest regeneration decisions are among the most important that foresters make. In many instances, the cost of regeneration may be the largest cost item incurred in producing a timber crop. Accordingly, information on the ...
    • The 1977 Virginia Outdoor Recreation Survey 

      Spittle, Gerald D.; Buhyoff, Gregory J.; Davy, John R., Jr.; McElwee, Robert L. (Virginia Tech. Division of Forestry and Wildlife Resources, 1978)
      The Virginia Commission of Outdoor Recreation coordinated through the Planning District Commissions an inventory of statewide recreation resources between April, 1977 and September, 1977. The School of Forestry and Wildlife ...
    • Methods for Modeling Individual Tree Growth and Stand Development in Seeded Loblolly Pine Stands 

      Daniels, Richard F.; Burkhart, Harold E.; Spittle, Gerald D.; Somers, Greg L. (Virginia Tech. Division of Forestry and Wildlife Resources, 1979)
      Methods were developed to model growth and development of seeded loblolly pine (Pinus taeda L.) stands, using individual trees as the basic growth units. Aggregated spatial patterns and individual tree sizes are generated ...
    • A Qualitative Analysis of The Southern Pine Beetle's Wildlife Impact 

      Maine, John D.; Leuschner, William A.; Tipton, Alan R. (Virginia Tech. Division of Forestry and Wildlife Resources, 1980)
      Wildlife's social value has long been known. Early attempts to place dollar values on wildlife were crude (Stains and Barkalow, 1951; Collins, 1959) and often incomprehensible. For example, Collins found that each deer ...
    • The 1977 Virginia Outdoor Recreation Demand Survey 

      Roggenbuck, Joseph W. (Virginia Tech. Division of Forestry and Wildlife Resources, 1978)
      Knowledge of the present and projected public demand for outdoor recreation is a key element in the planning of a comprehensive system of outdoor recreation opportunities throughout Virginia. Public preferences for outdoor ...
    • The 1977 Virginia Outdoor Recreation Needs Assessment 

      Roggenbuck, Joseph W. (Virginia Tech. Division of Forestry and Wildlife Resources, 1978)
      This outdoor recreation needs assessment booklet, published by the School of Forestry and Wildlife Resources, Virginia Polytechnic Institute and State University, in cooperation with the Virginia Commission of Outdoor ...
    • A General Population Dynamics Theory for Largemouth Bass 

      Jester, Douglas B., Jr.; Garling, Donald L, Jr.; Tipton, Alan R.; Lackey, Robert T. (Virginia Tech. Division of Forestry and Wildlife Resources, 1977)
      In this report, we develop a general theory of the relationship between life history and population structure for largemouth bass. In its most usable form the model is represented by a stochastic integral equation that is ...
    • Aids for Unit Planning on the Appalachian National Forests 

      Burkhart, Harold E.; Leuschner, William A.; Stuck, R. Dean; Porter, John R.; Reynolds, Marion R. (Virginia Tech. Division of Forestry and Wildlife Resources, 1976)
      This report summarizes the results of studies conducted in response to a cooperative agreement between the Southern Region, U.S. Forest Service and the Department of Forestry and Forest Products, Virginia Polytechnic ...
    • Virginia’s Forest Products Industry 

      Wisdom, Harold W.; Hudspeth, Timothy G. (Virginia Tech. Division of Forestry and Wildlife Resources, 1978)
      This report presents the results of an economic analysis of Virginia's forest products industry. The report is based on a special survey of wood use by the state's primary wood-using industries in 1976.
    • Simulation of Individual Tree Growth and Stand Development in Managed Loblolly Pine Plantations 

      Daniels, Richard F.; Burkhart, Harold E. (Virginia Tech. Division of Forestry and Wildlife Resources, 1975)
      A FORTRAN based simulator, PTAEDA, was developed to model growth in managed loblolly pine (Pin us taeda L.) plantations, using individual trees as the basic growth units. In PTAEDA, trees are assigned coordinate locations ...
    • Yields of Old-Field Loblolly Pine Plantations 

      Burkhart, Harold E.; Parker, Robert C.; Strub, Mike R.; Oderwald, Richard G. (Virginia Tech. Division of Forestry and Wildlife Resources, 1972-12)
      Loblolly pine (Pinus taeda L.) is one of the most important commercial species to the forest industries in the South, with a range extending through the Piedmont and the Atlantic and Gulf Coastal Plains from Maryland to ...
    • The Macroecology of Chemical Communication in Lizards: Do Climatic Factors Drive the Evolution of Signalling Glands? 

      Jara, Manuel; Frias-De-Diego, Alba; Garcia-Roa, Roberto; Saldarriaga-Cordoba, Monica; Harvey, Lilly P.; Hickcox, Rachel P.; Pincheira-Donoso, Daniel (2018)
      Chemical communication plays a pivotal role in shaping sexual and ecological interactions among animals. In lizards, fundamental mechanisms of sexual selection such as female mate choice have rarely been shown to be ...
    • Short- and long-term hydrologic controls on smouldering fire in wetland soils 

      Schulte, Morgan L.; McLaughlin, Daniel L.; Wurster, Frederic C.; Varner, J. Morgan; Stewart, Ryan D.; Aust, W. Mike; Jones, C. Nathan; Gile, Bridget (2019-02-21)
      Smouldering fire vulnerability in organic-rich, wetland soils is regulated by hydrologic regimes over short (by antecedent wetness) and long (through influences on soil properties) timescales. An integrative understanding ...
    • RNA interference suppression of AGAMOUS and SEEDSTICK alters floral organ identity and impairs floral organ determinacy, ovule differentiation, and seed-hair development in Populus 

      Lu, Haiwei; Klocko, Amy L.; Brunner, Amy M.; Ma, Cathleen; Magnuson, Anna C.; Howe, Glenn T.; An, Xinmin; Strauss, Steven H. (2019-04)
      The role of the floral homeotic gene AGAMOUS (AG) and its close homologues in development of anemophilous, unisexual catkins has not previously been studied. We transformed two RNA interference (RNAi) constructs, PTG and ...
    • Nitrogen deposition and climate change effects on tree species composition and ecosystem services for a forest cohort 

      Van Houtven, George; Phelan, Jennifer; Clark, Christopher; Sabo, Robert D.; Buckley, John; Thomas, R. Quinn; Horn, Kevin; LeDuc, Stephen D. (2019-05)
      The composition of forests in the northeastern United States and the ecosystem services they provide to future generations will depend on several factors. In this paper, we isolate the effects of two environmental drivers, ...