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Articles 1 - 21 of 21
Full-Text Articles in Life Sciences
Preliminary Flammability Assessment Of Sea Buckthorn From The Netherlands Compared To Known Flammable Shrubs Of The Southern And Western Us, Michael Tiller, Brian P. Oswald, Mathijs Schuijn
Preliminary Flammability Assessment Of Sea Buckthorn From The Netherlands Compared To Known Flammable Shrubs Of The Southern And Western Us, Michael Tiller, Brian P. Oswald, Mathijs Schuijn
Faculty Presentations
Sea buckthorn (Hippophae rhamnoides) is a common coastal species in The Netherlands that potentially burns with extreme energy levels. In this region of Europe that is experiencing increases in wildfire events, the need to gain a greater understanding of energy released when this species burns will improve fire behavior predictions. The objective of this study was to conduct an initial investigation into the foliage flammability of sea buckthorn to a common southern United States native shrub known for its flammability, yaupon (Ilex vomitoria), and two common dominant shrub species in California chaparral, chamise (Adenostoma fasciculatum …
Initial Investigation Of Seasonal Flammability Of Three Invasive East Texas Forest Understory Fuels Using Thermogravimetric Analysis, Michael Tiller, Brian P. Oswald, Alyx Frantzen, Warren Conway, I-Kuai Hung
Initial Investigation Of Seasonal Flammability Of Three Invasive East Texas Forest Understory Fuels Using Thermogravimetric Analysis, Michael Tiller, Brian P. Oswald, Alyx Frantzen, Warren Conway, I-Kuai Hung
Faculty Presentations
East Texas forest understory fuels have become increasingly infested with invasive species which have contributed to greater hazardous fuel loads when combined with decades of fire exclusion and passive management. This study focused on estimating seasonal changes in flammability parameters of invasive yaupon (Ilex vomitoria), Chinese privet (Ligustrum sinense), and Chinese tallow (Triadica sebifera) using thermogravimetric analysis. Foliage and stem samples were collected in the dormant (February) and growing (August) seasons. Differential thermogravimetric (DTG) and proximate analyses were used to estimate species specific flammability parameters related to relative spontaneous ignition temperature (RSIT), gas-phase maximum …
The Mcintire-Stennis Cooperative Forestry Research Program: The Driving Force Of Sustainable Forestry, Steven H. Bullard
The Mcintire-Stennis Cooperative Forestry Research Program: The Driving Force Of Sustainable Forestry, Steven H. Bullard
Faculty Presentations
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 …
Ghosts Of Nacogdoches Historical Trail, David Kulhavy, Michael Clanahan, Daniel Unger, Donald Brahman
Ghosts Of Nacogdoches Historical Trail, David Kulhavy, Michael Clanahan, Daniel Unger, Donald Brahman
Faculty Presentations
Welcome to the Ghosts of Nacogdoches Historic Trail. Open to all, this city trail is sponsored and maintained by the East Texas Area Council of the Boy Scouts of America. Throughout the United States of America the Boy Scouts encourage the hiking of National Historic Trails to increase the awareness of Boy Scouts towards the remarkable history of our country. The Ghosts of Nacogdoches Historic Trail is intended to focus narrowly on the importance of Nacogdoches as a hub of Western expansion and frontier development. An astute student will pick up the flavor of the Oldest Town in Texas and …
Assessing Impact Of Hurricane Rita On Habitat Red-Cockaded Woodpecker (Picoides Borealis) Clusters In Angelina National Forest, Texas, David Kulhavy, Jose Gonzales, Daniel Unger, I-Kuai Hung
Assessing Impact Of Hurricane Rita On Habitat Red-Cockaded Woodpecker (Picoides Borealis) Clusters In Angelina National Forest, Texas, David Kulhavy, Jose Gonzales, Daniel Unger, I-Kuai Hung
Faculty Presentations
Red-cockaded Woodpecker (RCW) habitat on the northern portion of the Angelina National Forest is composed primarily of loblolly and shortleaf pine with a significant hardwood component, especially in the midstory. Intensive management of RCW habitat in Angelina National Forest in Texas is a priority for this endangered species. The research inventoried downed timber in endangered red-cockaded woodpecker clusters on the Angelina National Forest in Texas following Hurricane Rita and utilized a geographic information system to analyze and display data to assess RCW habitat. In the Bannister Wildlife Management Unit of the Angelina National Forest, pine trees either uprooted or snapped …
Advanced Digital Image Processing Techniques For Natural Resource Assessment At Stephen F. Austin State University, Daniel Unger
Advanced Digital Image Processing Techniques For Natural Resource Assessment At Stephen F. Austin State University, Daniel Unger
Faculty Presentations
Graduate course work concentrating on land cover classification and digital image processing within the Arthur Temple College of Forestry and Agriculture at Stephen F. Austin State University is presented.
Evaluating Forest Volume Estimation At Barksdale Air Force Base Using Lidar And Multispectral Imagery, Richard E. Brooks, Daniel Unger, Hans Michael Williams, I-Kuai Hung
Evaluating Forest Volume Estimation At Barksdale Air Force Base Using Lidar And Multispectral Imagery, Richard E. Brooks, Daniel Unger, Hans Michael Williams, I-Kuai Hung
Faculty Presentations
Hardwood and pine stand volume estimates compiled from past field plot samples were compared to Lidar volume estimates through the interpretation of Lidar assessed height, crown width and trees per acre to ascertain if Lidar derived volume estimates can be used in lieu of traditional volume measurements.
Assessing Ecological Functions Of Bottomland Hardwood Wetlands Using Remote Sensing And Geographic Information Systems, Rachel Mcnamee, Hans Michael Williams, Kenneth W. Farrish, I-Kuai Hung, Daniel Unger
Assessing Ecological Functions Of Bottomland Hardwood Wetlands Using Remote Sensing And Geographic Information Systems, Rachel Mcnamee, Hans Michael Williams, Kenneth W. Farrish, I-Kuai Hung, Daniel Unger
Faculty Presentations
Bottomland hardwoods are one of the most rapidly diminishing wetland ecosystems due to agricultural clearing, development, and reservoir construction. As society has become more aware of the functions of wetlands, so has the importance in conservation of these valuable resources. The objective of this study was to compare the accuracy of Remote Sensing and GIS based functional assessment to the field based Hydrogeomorphic (HGM) approach. Remote sensing models were developed using a combination of soil maps, soil information, QuickBird ® multispectral satellite imagery, LiDAR derived Digital Elevation Model (DEM), and LiDAR derived Canopy Height Model. Results, although mixed, indicated that …
Soil And Plant Characteristics Compared Between Abandoned Natural Gas Drill Pads And Adjacent Areas, Barksdale Air Force Base, Louisiana, Adam J. Miller, Hans Michael Williams, Kenneth W. Farrish, Brian P. Oswald, Daniel Unger
Soil And Plant Characteristics Compared Between Abandoned Natural Gas Drill Pads And Adjacent Areas, Barksdale Air Force Base, Louisiana, Adam J. Miller, Hans Michael Williams, Kenneth W. Farrish, Brian P. Oswald, Daniel Unger
Faculty Presentations
Natural gas demand is projected to continue to rise. To meet this demand an increase in exploration and drilling will occur. This paper identifies some long term ecological impacts that remain following the plug and abandonment of the drill pads.
Estimating Waterfowl Densities In A Flooded Forest: A Comparison Of Methods, R. Montague Whiting Jr., J. Paul Cornes
Estimating Waterfowl Densities In A Flooded Forest: A Comparison Of Methods, R. Montague Whiting Jr., J. Paul Cornes
Faculty Presentations
During winter, aerial surveys are used to estimate densities of ducks that occupy open-water habitats. However, such surveys are ineffective for sampling forest-dwelling species, especially Aix sponsa (Wood Ducks), Anas platyrhynchos (Mallards), and Lophodytes cucullatus (Hooded Mergansers). We evaluated fixed-radius plot (FRP) and Reynolds and Goodrum variable-radius plot (VRP) methods for estimating waterfowl densities in a flooded hardwood bottomland. We constructed 15 elevated blinds on the Angelina River flood plain in eastern Texas and established a 1-ha FRP around each blind; color-coded markers were placed at fixed intervals from each blind. Observers surveyed waterfowl from blinds for 21 mornings during …
Landscape Analysis Of George W. Pirtle Scout Reservation, David Kulhavy, Daniel Unger, Frank B. Shockley, Josh Bardwell
Landscape Analysis Of George W. Pirtle Scout Reservation, David Kulhavy, Daniel Unger, Frank B. Shockley, Josh Bardwell
Faculty Presentations
To assist in detecting change over time for the forested landscape of George W. Pirtle Scout Reservation, Panola County, Texas, digital ortho-photography imagery (acquired 1996 and 2004) were used to designate forest cover types and hazard rating for forest insects and diseases. Status of camp grounds was ascertained and recommendations made for management using the GIS database created for the camp.
Correlation Between Pollen Dispersion And Forest Spatial Distribution Patterns In The Southeastern United States, I-Kuai Hung
Correlation Between Pollen Dispersion And Forest Spatial Distribution Patterns In The Southeastern United States, I-Kuai Hung
Faculty Presentations
The pollen that falls to the surface at any given point is called the pollen rain. For most regions of the world the pollen rain provides a fairly reliable record of the plants that produce and disperse airborne pollen within a radius of about 30 km from the sampled location. To some extent the local pollen rain can also reflect limited information about the insect-pollinated plants living in a region. For some regions of North America, existing studies of the pollen rain and the regional vegetation associated with those data demonstrate a reliable relationship between these two vegetation aspects. For …
Accuracy Assessment Of Classified Maps Derived From High And Midspatial Resolution Multispectral Data, Daniel Unger, Sean O'Melveny
Accuracy Assessment Of Classified Maps Derived From High And Midspatial Resolution Multispectral Data, Daniel Unger, Sean O'Melveny
Faculty Presentations
No abstract provided.
Comparing The Accuracy Of Multi-Source Data Integration For Two Supervised Image Classification Methods: Maximum Likelihood And Artificial Neural Network, Hillary Tribby, Daniel Unger
Comparing The Accuracy Of Multi-Source Data Integration For Two Supervised Image Classification Methods: Maximum Likelihood And Artificial Neural Network, Hillary Tribby, Daniel Unger
Faculty Presentations
No abstract provided.
Multi-Source Image Classification, Hillary Tribby, James Kroll, Daniel Unger, I-Kuai Hung, Hans Michael Williams
Multi-Source Image Classification, Hillary Tribby, James Kroll, Daniel Unger, I-Kuai Hung, Hans Michael Williams
Faculty Presentations
Since multi-source image classifications have the ability to exceed single source processes, such as traditional unsupervised classification methods, this paper will present the integration of four types of data: Lidar, elevation, multispectral and thermal. Using multi-source data and maximum likelihood classification methodology, as well as all possible permutations of data types, this paper will discuss ways to increase accuracy assessments of forested areas in east Texas and find the best combination of data sources.
Using Gis For Selecting Trees For Thinning, I-Kuai Hung, Benjamin C. Mcnally, Kenneth W. Farrish, Brian P. Oswald
Using Gis For Selecting Trees For Thinning, I-Kuai Hung, Benjamin C. Mcnally, Kenneth W. Farrish, Brian P. Oswald
Faculty Presentations
Thinning removes trees within a stand to regulate the level of site occupancy and subsequent stand development. Before thinning is applied, foresters determine the amount of residual growing stock, the spatial distribution of the residual trees, and the criteria used to select trees to cut. In this study, a portion of a loblolly pine (Pinus taeda) plantation was surveyed through a complete tree tally with the coordinates of each individual tree recorded. The dataset was then processed in a GIS program composed in Arc Marco Language (AML) applying a moving circular quadrat system superimposed over the study area. In each …
Forest Landscape Changes In East Texas From 1974 To 2002, I-Kuai Hung, Jeffrey M. Williams, James Kroll, Daniel Unger
Forest Landscape Changes In East Texas From 1974 To 2002, I-Kuai Hung, Jeffrey M. Williams, James Kroll, Daniel Unger
Faculty Presentations
Timber production has been one of the most important industries in east Texas since the mid 19th century. For over 100 years, timber has represented one-third of all agricultural income in this region. In order to review forest landscape changes over time -- resulting from many years of management and investment -- historical satellite remote sensing data from 1974 to 2002 were used to determine landscape patterns and changes in four counties of east Texas : Angelina, Nacogdoches , San Augustine, and Shelby . Land cover was classified either as forest or non-forest and a land cover map was generated …
Geospatial Analysis Of Reflectance And Ndvi Values In The Angelina Forest Ecosystem, Peter P. Siska, I-Kuai Hung
Geospatial Analysis Of Reflectance And Ndvi Values In The Angelina Forest Ecosystem, Peter P. Siska, I-Kuai Hung
Faculty Presentations
The aerial photographs and subsequently remote sensed imagery have been used for decades in classified landcover mapping, forest inventory, management, and evaluation of renewable resources. However, the implementation of geostatistical methods in remote sensing is of a newer date. In this study the variogram modeling is used to analyze the spatial structure of a forest canopy. The biomass and wood production can be evaluated in the studied area using NDVI (normalized difference vegetation index) values and kriging. The study area is located within the Angelina National Forest in the Neches River Basin. The Angelina Forest is an important part of …
Geospatial Analysis Of Reflectance And Ndvi Values In The Angelina Forest Ecosystem, I-Kuai Hung
Geospatial Analysis Of Reflectance And Ndvi Values In The Angelina Forest Ecosystem, I-Kuai Hung
Faculty Presentations
The aerial photographs and subsequently remote sensed imagery have been used for decades in classified landcover mapping, forest inventory, management, and evaluation of renewable resources. However, the implementation of geostatistical methods in remote sensing is of a newer date. In this study the variogram modeling is used to analyze the spatial structure of a forest canopy. The biomass and wood production can be evaluated in the studied area using NDVI (normalized difference vegetation index) values and kriging. The study area is located within the Angelina National Forest in the Neches River Basin. The Angelina Forest is an important part of …
Seasonal Comparison Of Remotely Sensed Relative Forest Ecosystem Temperature Zones With Topography And Forest Biomass In The Clear Springs Wilderness Area Of The Shawnee National Forest, Daniel Unger
Faculty Presentations
The use of thermal infrared data to delineate seasonal relative forest ecosystem temperature zones as a tool for forest ecological studies was analyzed. Analysis involved: (1) delineating relative seasonal forest ecosystem temperature zones within the Clear Springs Wilderness Area of the Shawnee National Forest using Landsat Thematic Mapper thermal infrared data; and, (2) quantifying the effect of topography and forest biomass on relative forest ecosystem temperature zones within seasons. Results indicate that slope was statistically uncorrelated with relative temperature zones within any season, aspect was statistically correlated with relative temperature zones during fall and winter, and forest biomass was statistically …
Comparison Of Presettlement And Present Vegetation Cover Of Marion County, Illinois Using A Geographic Information System, Daniel Unger
Comparison Of Presettlement And Present Vegetation Cover Of Marion County, Illinois Using A Geographic Information System, Daniel Unger
Faculty Presentations
The vegetation types of Marion County, Illinois prior to European settlement, which were derived from soil association surveys, were compared to a satellite map of current vegetation types to quantify their change over time. GIS analysis indicates that 10% of presettlement prairie is currently grassland, 2% of presettlement prairie has been converted to forest, 32% of original prairie has been converted to agriculture and urban use, 17% of presettlement forest remains intact, grassland comprises 18% of presettlement forest while 21% of presettlement forest has been converted to agricultural and urban use.