The TWDEF is in the Wasatch Mountains of northern Utah about 15 km south of the Utah-Idaho border and about 65 km east of Logan. It is comprised of four sections (sec. 15, 16, 21 and 22, Township 13 North, Range 4 East, Salt Lake Meridian). Utah State University owns one of the sections; the remainder are part of the Logan Ranger District of the Cache National Forest. Access to within 8 km of the experimental forest is via Highway 89. Access to the boundary and within the forest is on unpaved but excellent forest road which bisects the forest north to south; the remainder of the forest is accessed via primitive roads and trails. Winter access is limited to skis or snow machine.

Engelmann spruce (Picea engelmannii) and subalpine fir (Abies lasiocarpa) are the dominant late successional species throughout the forest. The major early successional species include lodgepole pine (Pinus contorta var. latifolia) and aspen (Populus tremuloides), with Douglas-fir (Pseudotsuga menziesii) and limber pine (Pinus flexilis) on south-facing ridges and at lower elevations. The aspen and conifer stands are interspersed with meadows and shrub-forb-grass uplands.




A Preliminary Quantification of the Impacts of Aspen to Conifer Succession on Water Yield - I. Heat Pulse Methodology for Model Calibration, Gerald F. Gifford, William Humphries, and Richard A. Jaynes; Water Resources Bulletin

Patterns of Soil Loss and Snowmelt from an Intermountain Rangeland Site, Steven A. Loomis


Average Seasonal Phytomass: A Temporally Independent Index of Herbaceous Plant Dominance, N E. West and G A Reese; Vegetatio


Rhizosphere N2 Fixation in a Forest Ecosystem in situ Assays and Evaluation of the Acetylene Reduction Technique on the Utah State University Forest, Inger Borjesson

The Effects of Initial Size on Subsequent Performance in Container Grown Engelmann Spruce Seedlings, Franklin D. Hines


Reproductive Attributes of Some Rocky Mountain Subalpine Herbs in Successional Context, David J. Schimpf and Robert L. Bayn Jr.; Great Basin Naturalist



Belowground Herbivory: The Adaptive Geometry of Geomyid Burrows, Douglas C. Andersen; American Naturalist

Plant Spacing: A Size Sensitive Model with Implications for Competition, Robert L. Bayn Jr.


Selective Extinction and Speciation: Their Influence on the Structure and Functioning of Communities and Ecosystems, Charles W. Fowler and James A. MacMahon; American Naturalist


Erosion from Melt of a Mountain Snowpack, George E. Hart and Steven A. Loomis; Journal of Soil and Water Conservation

Correlation of Heat Pulse Velocity Measurements and Transpiration for Aspen, Engelmann Spruce and Subalpine Fir in Northern Utah, William E. Humphries

Nitrogen Accretion in a Rocky Mountain Subalpine Succession, Kathleen E. Mead


Soil Biological Properties of a Montane Forest Sere: Corroboration of Odum's Postulates, J Skujins and B Klubek; Soil Biology and Biochemistry


Drought-Induced Changes in Avian Community Structure Along a Montane Sere, Kimberly G. Smith; Ecology


Food, Predation, and Reproductive Ecology of the Dark-Eyed Junco in Northern Utah, Kimberly G. Smith and Douglas C. Andersen; The Auk


Snowshoe Hare Cover Relationships in Northern Utah, Michael L. Wolfe, Norbert V. Debyle, Clark S. Winchell, and Thomas R. McCabe; Journal of Wildlife Management



Population Dynamics and Bioenergetics of a Fossorial Herbivore, Thomomys talpoides (Rodentia: Geomyidae), in a Spruce-Fir Sere, Douglas C. Andersen and James A. MacMahon; Ecological Monographs


ATP Concentration and Soil Respiration at Reduced Water Potentials in Arid Soils, W G. Knight and J Skujins; Soil Science Society of America Journal


An Organism-Centered Approach to Some Community and Ecosystem Concepts, James A. MacMahon, David J. Schimpf, Douglas C. Andersen, Kimberly G. Smith, and Robert L. Bayn Jr.; Journal of Theoretical Biology

The Use of Reineke's Stand-Density Index for Uneven-Aged Timber Management, Douglas H. Page

Avian Resource Partitioning Along a Montane Sere, Kimberly G. Smith


Bird Communities along a Montane Sere: Community Structure and Energetics, Kimberly G. Smith and James A. MacMahon; The Auk


Population Dynamics and Bioenergetics of a Fossorial Rodent, the Northern Pocket Gopher (Themomys talpoides), in a Spruce-Fir Ecosystem, Douglas C. Andersen


Herbivorous Mammals Along a Montane Sere: Community Structure and Energetics, Douglas C. Andersen, James A. MacMahon, and Michael L. Wolfe; Journal of Mammalogy


Evaluation of Double-Sampling Estimators of Subalpine Herbage Production, Gary A. Reese, Robert L. Bayn, and Neil E West; Journal of Range Management


Some Aspects of Succession in the Spruce-Fir Forest Zone of Northern Utah, David J. Schimpf, Jan A. Henderson, and James A. MacMahon; Great Basin Naturalist


Nongame Birds of the Rocky Mountain Spruce- Fir Forests and Their Management, Kimberly G. Smith; Workshop Proceedings: Management of Western Forests and Grasslands for Nongame Birds


Infection of Engelmann-Spruce Seed by Geniculodendron pyriforme in Western North America, M W. Wicklow-Howard; Mycologia


Pollination Dynamics in Two Subalpine Flower Meadows, Peter Andrew Beelow III


Effects of Clearcutting on Soil Water Depletion in an Engelmann Spruce Stand, George E. Hart and David A. Lomas; Water Resources Research

An Investigation of the Environmental Relationships of Selected Forest Habitat Types in Northern Utah, Penelope Morgan Lawton

Diversity and Production of Herbaceous Vegetation in a Northern Utah Subalpine Chronosequence, Gary A. Reese


Common Redpolls Using Spruce Seeds in Northern Utah, Kimberly G. Smith; The Wilson Bulletin

The Wood and Bark Biomass and Production of Populus tremuloides, Abies lasiocarpa and Picea engelmannii in Northern Utah, George Zimmermann



Observations on Reproduction, Growth, and Behavior of the Northern Pocket Gopher (Thomomys talpoides), Douglas C. Anderson; Journal of Mammalogy


Migrational Movements of Blue Jays West of the 100th Meridian, Kimberly G. Smith; North American Bird Bander


Range Extension of the Blue Jay into Western North America, Kimberly G. Smith; Bird-Banding


White-Winged Crossbills Breed in Northern Utah, Kimberly G. Smith; Western Birds

Changes in Spider Community Attributes Along a Subalpine Successional Gradient, Gerald N. Waagen


Soil Water Depletion Following Clearcutting Small Plots in a Spruce-Fir Forest in Northern Utah, David A. Lomas

Tree Leaf Biomass, and Rates of Litterfall, Decomposition and Litter Accumulation through Three Stages of a Successional Sere in Northern Utah, Steven E. Williams



Population Ecology of Snowshoe Hares in the Central Rocky Mountains, Richard A. Dolbeer and William R. Clark; Journal of Wildlife Management


A Study of the Radiation Quality Under Plant Canopies in the Wave Range 0.4 to 2.5 Microns, Nolasco G. Baldazo


Effects of Temperature, Light and Water Stress on the Germination of Several Rocky Mountain Conifers, Allen L. Christophersen

Reproduction, Survival and Density of Snowshoe Hares in Northeastern Utah, William R. Clark

Internal Water Potential of an Engelmann Spruce Stand in Relation to Soil and Atmospheric Factors, Richard L. Meyn


The Influence of Atmospheric Dust and Foliar Leachates on the Chemical Quality of Throughfall in Northern Utah, Dennis R. Parent


Soil Moisture Depletion, Actual and Potential Evapotransipration in an Engelmann Spruce-Subalpine Fir Forest, Frank D. Eaton

Influence of Size of Cone Crop on Diameter Growth of Engelmann Spruce (Picea Engelmannii Parry), Herbert Hager



Disappearance of Plant Material Under a Winter Snow Cover, A T. Bleak; Ecology