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Articles 121 - 150 of 513
Full-Text Articles in Forest Sciences
Snowy Plover Nest Site Selection, Spatial Patterning, And Temperatures In The Southern High Plains Of Texas, David Saalfeld, Warren C. Conway, William P. Johnson, David A. Haukos
Snowy Plover Nest Site Selection, Spatial Patterning, And Temperatures In The Southern High Plains Of Texas, David Saalfeld, Warren C. Conway, William P. Johnson, David A. Haukos
Faculty Publications
Snowy plover (Charadrius nivosus) populations have declined throughout their range, in part because of habitat degradation and poor nest success, making information regarding regionally specific nest site selection and spatial patterns important when considering habitat conservation and management guidelines. We determined nest site selection characteristics (n=80) and examined spatial patterns (n=215) of snowy plover nests in saline lakes in the Southern High Plains (SHP) of Texas. At 104 nests, we examined the influence of substrate type on nest temperatures and heat mitigation. Snowy plover nests were more likely to be found near an object, on pebble substrate, and with fewer …
Increased Uniformity By Planting Clones Will Likely Have A Minimal Effect On Inventory Costs, Curtis L. Vanderschaaf, Dean W. Coble, David B. South
Increased Uniformity By Planting Clones Will Likely Have A Minimal Effect On Inventory Costs, Curtis L. Vanderschaaf, Dean W. Coble, David B. South
Faculty Publications
When conducting inventories, reducing variability among tree diameters, heights, and ultimately volumes or biomass, can reduce the number of points/plots needed to obtain a desired level of precision. We present a simple analysis examining the potential reduction in discounted inventory costs when stand variability is decreased (via improved genetics and intensive management on a uniform soil). Sampling time might be reduced if the coefficient of variation in point volume/biomass estimates is reduced to 10% (versus 25% for genetically diverse stands). However, if this level of variability could be achieved (and depending on the desired probability and allowable percent error) discounted …
A Chronicle Of Changing American Attitudes Toward Wetlands, Matthew W. Mcbroom
A Chronicle Of Changing American Attitudes Toward Wetlands, Matthew W. Mcbroom
Faculty Publications
No abstract provided.
Snapping A Pour Point For Watershed Delineation In Arcgis Hydrologic Analysis, Yanli Zhang, Matthew W. Mcbroom, Jason Grogan, I-Kuai Hung
Snapping A Pour Point For Watershed Delineation In Arcgis Hydrologic Analysis, Yanli Zhang, Matthew W. Mcbroom, Jason Grogan, I-Kuai Hung
Faculty Publications
No abstract provided.
A Landscape-Scale Approach For Modeling Habitat Suitability For The Louisiana Black Bear (Ursus Americanus Luteolus) In East Texas, Dan J. Kaminski, Christopher E. Comer
A Landscape-Scale Approach For Modeling Habitat Suitability For The Louisiana Black Bear (Ursus Americanus Luteolus) In East Texas, Dan J. Kaminski, Christopher E. Comer
Faculty Publications
No abstract provided.
Bobcats Do Not Exhibit Rub Response Despite Presence At Hair Collection Stations, Chirstopher E. Comer, Symmank M. E., James C. Kroll
Bobcats Do Not Exhibit Rub Response Despite Presence At Hair Collection Stations, Chirstopher E. Comer, Symmank M. E., James C. Kroll
Faculty Publications
We evaluated the detection rate for hair snare sampling for bobcats (Lynx rufus) using colocated hair snares and infrared-triggered cameras at 20 locations on private property in eastern Texas. Hair snares and cameras were placed together at survey stations that included both visual and olfactory attractants. In 1,680 trap-nights we photographically documented 15 visits by bobcats but collected only one bobcat hair sample. Our observations suggested limited rubbing behavior by bobcats at hair snares despite presence at hair collection stations. The explanation for this behavior remains unclear but is consistent with observations of low and variable hair trap …
Cooperative Red-Cockaded Woodpecker Translocation Strategy Throughout The Southeast, Robert J. Warren, C. Joseph Nairn
Cooperative Red-Cockaded Woodpecker Translocation Strategy Throughout The Southeast, Robert J. Warren, C. Joseph Nairn
Faculty Publications
No abstract provided.
A Current Bibliographic Resource For The Red-Cockaded Woodpecker, Federal Wildlife Service
A Current Bibliographic Resource For The Red-Cockaded Woodpecker, Federal Wildlife Service
Faculty Publications
No abstract provided.
A ‘Driving Force’ In Developing The Nation’S Forests: The Mcintire-Stennis Cooperative Forestry Research Program., Steven H. Bullard, Perry J. Brown, Catalino A. Blanche, Richard W. Binker, Don H. Thompson
A ‘Driving Force’ In Developing The Nation’S Forests: The Mcintire-Stennis Cooperative Forestry Research Program., Steven H. Bullard, Perry J. Brown, Catalino A. Blanche, Richard W. Binker, Don H. Thompson
Faculty Publications
The McIntire-Stennis (M-S) Cooperative Forestry Research Program has provided fundamental support for creating and strengthening forestry research and graduate training efforts at colleges and universities across the nation for nearly 50 years. M-S funding has helped produce thousands of forestry scientists and other research professionals, and M-S–supported research has provided critical basic understanding and applied solutions to extend the benefits that flow from forests and related rangelands across the nation over time. The 1962 legislation that created the M-S program authorized funding of up to one-half of the funds appropriated for federal forestry research conducted directly by the USDA. Throughout …
Soil Erosion Modeling With The Modified Universal Soil Loss Equation, Yanli Zhang, Jason Grogan, I-Kuai Hung, Ramanathan Sugumaran
Soil Erosion Modeling With The Modified Universal Soil Loss Equation, Yanli Zhang, Jason Grogan, I-Kuai Hung, Ramanathan Sugumaran
Faculty Publications
No abstract provided.
A Mixed-Effects Height-Diameter Model For Individual Loblolly And Slash Pine Trees In East Texas, Dean W. Coble, Young Jin Lee
A Mixed-Effects Height-Diameter Model For Individual Loblolly And Slash Pine Trees In East Texas, Dean W. Coble, Young Jin Lee
Faculty Publications
A new mixed-effects model was developed that predicts individual-tree total height for loblolly (Pinus taeda) and slash pine (Pinus elliottii) as a function of individual-tree diameter (in.), dominant height (ft), quadratic mean diameter (in.), and maximum stand diameter (in.). Data from 119,983 loblolly pine and 42,697 slash pine height– diameter observations collected on 185 loblolly pine and 84 slash pine permanent plots located in plantations throughout East Texas were used for model fitting. This new model is an improvement over earlier models fit with ordinary least squares, in that it can be calibrated to a new stand with observed height– …
Spread Of Plague Among Black-Tailed Prairie Dogs Is Associated With Colony Spatial Characteristics, Christopher Frey, Tammi L. Johnson, Jack Cully Jr., Sharon K. Collinge, Chris Ray, Brett Sandercock
Spread Of Plague Among Black-Tailed Prairie Dogs Is Associated With Colony Spatial Characteristics, Christopher Frey, Tammi L. Johnson, Jack Cully Jr., Sharon K. Collinge, Chris Ray, Brett Sandercock
Faculty Publications
Sylvatic plague (Yersinia pestis) is an exotic pathogen that is highly virulent in black-tailed prairie dogs (Cynomys ludovicianus) and causes widespread colony losses and individual mortality rates >95%. We investigated colony spatial characteristics that may influence inter-colony transmission of plague at 3 prairie dog colony complexes in the Great Plains. The 4 spatial characteristics we considered include: colony size, Euclidean distance to nearest neighboring colony, colony proximity index, and distance to nearest drainage (dispersal) corridor. We used multi-state mark–recapture models to determine the relationship between these colony characteristics and probability of plague transmission among prairie dog colonies. Annual mapping of …
Stakeholders’ Attitudes Toward Black Bear In East Texas (Abstract), Williams Stephens Pat, Ray Darville, Adam Keul, Michael Legg, Christopher E. Comer
Stakeholders’ Attitudes Toward Black Bear In East Texas (Abstract), Williams Stephens Pat, Ray Darville, Adam Keul, Michael Legg, Christopher E. Comer
Faculty Publications
No abstract provided.
The Changing Roles Of Natural Resource Professionals: Providing Tools To Students To Teach The Public About Fire, Pat Stephens Williams, Brian Oswald, Karen Stafford, Justice Jones, David Kulhavy
The Changing Roles Of Natural Resource Professionals: Providing Tools To Students To Teach The Public About Fire, Pat Stephens Williams, Brian Oswald, Karen Stafford, Justice Jones, David Kulhavy
Faculty Publications
The Arthur Temple College of Forestry and Agriculture (ATCOFA) at Stephen F. Austin State University is taking a proactive stance toward preparing forestry students to work closely with the public on fire planning in wildland-urban interface areas. ATCOFA's incorporation of the "Changing Roles" curriculum provides lessons on how natural resource managers' roles are (1) different than they used to be, and (2) ever-evolving. The undergraduate Forestry Field Station summer program at the University's Piney Woods Conservation Center now emphasizes the importance and challenges of working with the public. The program brings practicing professionals from the Texas Forest Service to describe …
Involving The Public In Restoring The Role Of Fire In The Longleaf Pine Ecosystem Of Upland Island Wilderness, Brian P. Oswald, Ike Mcwhorter, Penny Whisenant
Involving The Public In Restoring The Role Of Fire In The Longleaf Pine Ecosystem Of Upland Island Wilderness, Brian P. Oswald, Ike Mcwhorter, Penny Whisenant
Faculty Publications
The 13,250-acre Upland Island Wilderness (UIW) in Texas was established in 1984 and is managed by the United States Forest Service (USFS). Historically, portions of it consisted of open and diverse longleaf pine (Pinus palustris) ecosystems which depend on frequent, low-intensity surface fires. As in many other relatively small wilderness areas, the vegetation and fuel conditions in the UIW underwent extensive changes after wilderness designation. Lightning-caused wildfires were no longer allowed to burn with the frequency or intensity that characterized the natural fire regime. This has resulted in an increase of shade-tolerant trees and shrubs, heavy accumulations of …
The Issue Of Saf Membership: An Elite Or Broad Organization?, T. J. Straka, G. Brown, Steven H. Bullard
The Issue Of Saf Membership: An Elite Or Broad Organization?, T. J. Straka, G. Brown, Steven H. Bullard
Faculty Publications
No abstract provided.
A Modified Stand Table Projection Model For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Micky G. Allen Ii, Dean W. Coble, Quang V. Cao, Jimmie Yeiser, I-Kuai Hung
A Modified Stand Table Projection Model For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Micky G. Allen Ii, Dean W. Coble, Quang V. Cao, Jimmie Yeiser, I-Kuai Hung
Faculty Publications
Four methodologies to project future trees per acre by diameter class were compared to develop a new modified stand table projection growth model for unmanaged loblolly pine (Pinus taeda L.) and slash pine (Pinus elliottii Engelm.) plantations in East Texas. The new models were fit to 92,882 observations from 153 permanent plots located in loblolly pine plantations and 33,792 observations from 71 permanent plots located in slash pine plantations throughout East Texas. The new models were validated with 12,750 observations from 22 permanent plots and 3,724 observations from 9 permanent plots located in loblolly and slash pine plantations, respectively. The …
A Gis Tool For Plant Spatial Pattern Analysis, Yanli Zhang, Nathan Woodward, Daniel Unger, I-Kuai Hung, Brian P. Oswald, Kenneth W. Farrish
A Gis Tool For Plant Spatial Pattern Analysis, Yanli Zhang, Nathan Woodward, Daniel Unger, I-Kuai Hung, Brian P. Oswald, Kenneth W. Farrish
Faculty Publications
A GIS program, ArcPlantPattern, was developed with Visual Basic .NET and ArcObjects as an ArcGIS extension to assist the investigation of plant distribution patterns (species composition as occurrence probability and spacing as distances among species) and to design planting plan maps for patch planting. ArcPlantPattern is the first software of its kind. It can be used for arid and semiarid lands reclamation, burned area rehabilitation, or designing landscapes with a required plant community distribution. ArcPlantPattern may also be applicable to other spatial point pattern analysis, such as geology, geography and wildlife habitat.
Red-Cockaded Woodpecker Cavity Tree Damage By Hurricane Rita: An Evaluation Of Contributing Factors, Ben Bainbridge, Kristen A. Baum, Daniel Saenz, Cory K. Adams
Red-Cockaded Woodpecker Cavity Tree Damage By Hurricane Rita: An Evaluation Of Contributing Factors, Ben Bainbridge, Kristen A. Baum, Daniel Saenz, Cory K. Adams
Faculty Publications
Picoides borealis (Red-cockaded Woodpecker) is an endangered species inhabiting pine savannas of the southeastern United States. Because the intensity of hurricanes striking the southeastern United States is likely to increase as global temperatures rise, it is important to identify factors contributing to hurricane damage to Red-cockaded Woodpecker cavity-trees. Our objectives were to examine the effects of landscape-level factors on wind damage to cavity-trees and assess the relative risk of wind damage for different tree species and trees with different types of cavities. We evaluated wind damage to cavity-trees from Hurricane Rita on the Angelina, Sabine, and Davy Crockett national forests …
Basic Concepts In Forest Valuation And Investment Analysis: Edition 3.0, Steven H. Bullard, Thomas J. Straka
Basic Concepts In Forest Valuation And Investment Analysis: Edition 3.0, Steven H. Bullard, Thomas J. Straka
Faculty Publications
This book was originally intended to supplement lectures in forestry economics at the undergraduate level. It’s currently used for that purpose in ‘Forest Resource Economics’ courses at several universities. The book is also intended, however, to serve as a basic reference for foresters with experience in valuation and investment analysis concepts and methods. It has proven to be a valuable resource in forest valuation and investment analysis workshops for practicing foresters, landowners, and others interested in forestry investments.
Web-Based Spatial Decision Support System And Watershed Management With A Case Study, Yanli Zhang, Matthew W. Mcbroom, J. Degroote, R. L. Kauten, P. K. Barten
Web-Based Spatial Decision Support System And Watershed Management With A Case Study, Yanli Zhang, Matthew W. Mcbroom, J. Degroote, R. L. Kauten, P. K. Barten
Faculty Publications
In order to maintain a proper balance between development pressure and water resources protection, and also to improve public participation, efficient tools and techniques for soil and water conservation projects are needed. This paper describes the development and application of a web-based watershed management spatial decision support system, WebWMPI. The WebWMPI uses the Watershed Management Priority Indices (WMPI) approach which is a prioritizing method for watershed management planning and it integrates land use/cover, hydrological data, soils, slope, roads, and other spatial data. The land is divided into three categories: Conservation Priority Index (CPI) land, Restoration Priority Index (RPI) land, and …
Cooper’S Hawk Nest Site Characteristics In The Pineywoods Region, Richard R. Schaefer, D. Craig Rudolph, Josh B. Pierce, Jesse F. Fagan
Cooper’S Hawk Nest Site Characteristics In The Pineywoods Region, Richard R. Schaefer, D. Craig Rudolph, Josh B. Pierce, Jesse F. Fagan
Faculty Publications
Early accounts describe the Cooper’s Hawk (Accipiter cooperi) as a species in decline in much of North America during the early twentieth century (Bent 1937), particularly when in close proximity to humans (Eaton 1914). This decreasing population trend continued to be recognized later in the century in both Texas (Oberholser 1974) and Louisiana (Lowery 1974). Shooting and trapping during the first half of the 1900s, and pesticide use (especially DDT) after World War II are suggested as primary causes of the decline (Henny and Wight 1972, Bednarz et al. 1990). The Migratory Bird Treaty Act of 1972 and the ban …
Geolite, An Arcgis Extension To Assist In Lidar Data Processing, Yanli Zhang, Jason Grogan, I-Kuai Hung, Ramanathan Sugumaran
Geolite, An Arcgis Extension To Assist In Lidar Data Processing, Yanli Zhang, Jason Grogan, I-Kuai Hung, Ramanathan Sugumaran
Faculty Publications
No abstract provided.
Evaluating Tiffs (Toolbox For Lidar Data Filtering And Forest Studies) In Deriving Forest Measurements From Lidar Data, John Chapman, I-Kuai Hung, Jeff Tippen
Evaluating Tiffs (Toolbox For Lidar Data Filtering And Forest Studies) In Deriving Forest Measurements From Lidar Data, John Chapman, I-Kuai Hung, Jeff Tippen
Faculty Publications
Recent advances in LiDAR (Light Detection and Ranging) technology have allowed for the remote sensing of important forest characteristics to be more reliable and commercially available. Studies have shown that this technology can adequately estimate forest characteristics such as individual tree locations, tree heights, and crown diameters. These values are then used to estimate biophysical properties of forests, such as basal area and timber volume. This study assessed the capability of a commercially available program, Tiffs (Toolbox for Lidar Data Filtering and Forest Studies), to accurately estimate forest characteristics, as compared to data collected at the plot level using traditional …
Soil Viewer Extension Brings Soil Data To Your Gis, Jason Grogan, I-Kuai Hung, Yanli Zhang
Soil Viewer Extension Brings Soil Data To Your Gis, Jason Grogan, I-Kuai Hung, Yanli Zhang
Faculty Publications
No abstract provided.
Assessing The Efficacy Of Modis Satellite-Derived Start Of Growing Season For Jurisdictional Determination Of East Texas Bottomland Hardwood Wetlands, Karen Malone, Hans Michael Williams, I-Kuai Hung, Daniel Unger
Assessing The Efficacy Of Modis Satellite-Derived Start Of Growing Season For Jurisdictional Determination Of East Texas Bottomland Hardwood Wetlands, Karen Malone, Hans Michael Williams, I-Kuai Hung, Daniel Unger
Faculty Publications
Introduction: Crucial to the determination of a jurisdictional wetland is the definition of “growing season”. Satellite imagery is being utilized in other ecological applications, but is lagging in wetland growing season determination. Both cost and temporal limitations historically have restrained use of satellite imagery in assessing the start up of the growing season. Multiple commercial satellites are available that provide high resolution imagery, but the cost are prohibitive for most studies. The National Aeronautics and Space Administration (NASA) and the U.S. Geological Survey (USGS) jointly manage the Landsat and the Moderate-resolution Imaging Spectroradiometer (MODIS) satellite programs. Landsat Enhanced Thematic Mapper …
Aboveground Biomass Estimation For Three Common Woody Species In The Post Oak Savannah Of Texas, Brian P. Oswald, R R. Botting, Dean W. Coble, Ken W. Farrish
Aboveground Biomass Estimation For Three Common Woody Species In The Post Oak Savannah Of Texas, Brian P. Oswald, R R. Botting, Dean W. Coble, Ken W. Farrish
Faculty Publications
The Post Oak Savannah occupies about 3.4 million hectares of gently rolling to hilly lands in east central Texas. Large post oak (Quercus stellata Wangenh.) blackjack oak (Quercus marilandica Munchh.), Eastern redcedar (Juniperus virginiana L.) and honey mesquite (Juniperus virginiana L.) usually form the overstory, often above thickets of yaupon (Ilex vomitoria), winged elm (Ulmus alata), gum bumelia (Sideroxylon lanuginosum Michx. Subsp. Oblongifolium (Nutt) T.D. Penn.), and live oak (Quercus virginiana Mill.). Historically limited to rocky hillsides …
Collecting Multiple Point Features Referenced To A Single Geographic Position In Arcpad, Jason Grogan, I-Kuai Hung, Yanli Zhang
Collecting Multiple Point Features Referenced To A Single Geographic Position In Arcpad, Jason Grogan, I-Kuai Hung, Yanli Zhang
Faculty Publications
No abstract provided.
Relationships Between Herbaceous Diversity And Biomass In Two Habitats In Arid Mediterranean Rangeland, Mohammad N. Alhamad, Brian P. Oswald, Mohammad M. Bataineh, Mohammad A. Alrababah, Mohammad M. Gharaibeh
Relationships Between Herbaceous Diversity And Biomass In Two Habitats In Arid Mediterranean Rangeland, Mohammad N. Alhamad, Brian P. Oswald, Mohammad M. Bataineh, Mohammad A. Alrababah, Mohammad M. Gharaibeh
Faculty Publications
Plant diversity patterns vary across the landscape. This study was conducted to answer the question: What is the pattern of species diversity (α and β) along an abstract productivity/cover gradient at two topographical positions (Wadi (a depression with overland flow) and hilltop) of a Mediterranean herbaceous plant community in Jordan? Results indicated that the less productive hilltop localities exhibited higher species richness than the more productive Wadi localities. Species richness exhibited a unimodal relationship with aboveground biomass within Wadis whereas a positive linear relationship was revealed for hilltops. Within Wadis, abundant species did not show a significant relationship with productivity …
Self-Referencing Site Index Equations For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Dean W. Coble, Young Jin Lee
Self-Referencing Site Index Equations For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Dean W. Coble, Young Jin Lee
Faculty Publications
The Schnute growth function was used in this study to model site index for unmanaged or low-intensity managed loblolly pine (Pinus taeda, L.) and slash pine (Pinus elliottii, Engelm.) plantations in east Texas. The algebraic difference approach was used to derive an anamorphic base-age invariant site function that was fi t as a fi xed base-age anamorphic site function (base age = 25 years). The dataset was comprised of 1,135 and 502 serially correlated height-age observations of loblolly and slash pine, respectively, which were collected over a 20-year-period as a part of the East Texas Pine Plantation Research Project (ETPPRP). …