Texas

Context-Specific Effects of Severe Drought on Freshwater Mussel Communities Freshwater mussel populations are often small and fragmented due to stream and landscape degradation. Isolated populations are highly vulnerable to natural disturbance. ...more...	Genetics of Loblolly Pine Reference karyotype and cytomolecular maps are pre-requisite tools for extensive genome research. ...more...	Effects of Climate on Frog Breeding Activity Global climate change and amphibian decline are two major phenomena that have received considerable media and research attention in recent years, and both could profoundly affect biodiversity within aquatic ecosystems. ...more..
Advanced Technology Used to Monitor Forest Change Many forest changes are lost in the background at a distance, but an isolated change may be part of a broader pattern when viewed from afar. ...more...	A New Phase Change in Landscape Dynamics Most human impacts on forests and grasslands are mediated by land-use changes that occur as a result of population increases and new home construction in undeveloped areas or semi-natural landscapes. ...more...	Data Query Tool for Invasive Plant Inventory on FIA Plots In 2001, the SRS Forest Inventory and Analysis (FIA) program started systematically surveying FIA plots for the presence and relative abundance of more than 25 non-native invasive plants. ...more...
Timber Product Output (TPO) in the South in 2005 The South’s forest industry is a multi-billion dollar economic engine that employs hundreds of thousands of employees across the region. ...more...	Defining Socially-Optimal Fuel Programs One of the most important and elusive issues regarding fire management is defining the “best” amount of fuel treatments to apply to a forested landscape. ...more...	Production and Costs of Biomass Removal from National Forest Lands The National Forests in Alabama are seeking non-traditional ways to remove unmerchantable material to reduce fuels and improve forest health and wildlife habitat. ...more...
Differences between African American and Hispanic Visitation to National Forests Recent data from the Forest Service's on-site National Visitor Use Monitoring Survey (NVUM) shows that visits made by African Americans ...more...	Southern Biofuels Assessment Program Woody biomass is primarily a raw material for either structural wood-based composites or as a thermal feedstock for the generation of energy. ...more..	Recreation Visits to Wilderness and Primitive Areas Station researchers, using data from the Census, the National Visitor Use Monitoring Project, and the National Survey on Recreation and the Environment developed models to examine national participation and use of wilderness and primitive areas for outdoor recreation. ...more...
National Leader in Recreation Research For over 30 years the Forest Service and the Recreation Research Unit in Athens, Georgia has been a recognized leader in forming partnerships to address needs for information and technology to support better policy and management of public lands. ...more...

 

Other Accomplishments

• Long-term Soil Productivity Can Be Maintained Under Intensive Timber Management—Intensive harvesting can deplete soil nutrient resources and compact or disturb surface soils, causing productivity and ecosystem health to decline. (read the details)
• Applied Silvicultural Assessment for Southern Pine Beetle—SRS scientists and University cooperators are developing landscape-based computer models to quantify the likelihood of forests being attacked by southern pine beetle. (read the details)
• Forest Inventory and Analysis—Researchers in the FIA unit have been conducting annual inventories in cooperation with the Georgia Forestry Commission since 1998. (read the details)

Research Accomplishments in Texas

Context-Specific Effects of Severe Drought on Freshwater Mussel Communities

Freshwater mussel populations are often small and fragmented due to stream and landscape degradation. Isolated populations are highly vulnerable to natural disturbance. We studied five small stream sites on Bankhead National Forest heavily impacted by severe drought in 2000; one site dried almost completely and four sites experienced total or near cessation of flow. Three large stream sites retained flow and experienced minor streambed exposure. In small streams, mussel density before and after the drought declined by 65-83 percent. Most mussel species declined by similar percentages. Likelihood of survival was mostly a function of pre-drought abundance. Assemblage composition changed primarily due to loss of rare species, resulting in a shrinking species pool. We found no evidence for changes in total abundance or composition in large streams that continued to flow. Mussels are also highly sensitive to secondary effects of drought, most likely low levels of dissolved oxygen caused by low flow, warm temperatures, and high biological oxygen demand. Wendell R. Haag (whaag@fs.fed.us) and Melvin L. Warren (mwarren01@fs.fed.us)
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Genetics of Loblolly Pine

Reference karyotype and cytomolecular maps are pre-requisite tools for extensive genome research.  The karyotype describes the general features and landmarks of a species’ complement of chromosomes, while the cytomolecular map locates the landmarks to specific positions on each chromosome.  SRS scientists have developed and published the first karyotype and cytomolecular map for loblolly pine using data from multiple cells of multiple families of loblolly pine. Comprehensive genetic and physical maps along with a complete DNA sequence of loblolly pine are currently the highest priority needs within the conifer genome community.  Maps and sequences will allow genome researchers to discover at the gene level what makes a conifer different from a hardwood and to develop advanced technologies for improving the quality and quantity of wood-based products. Nurul Faridi (nfaridi@fs.fed.us) and Dana Nelson (dananelson@fs.fed.us)
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Effects of Climate on Frog Breeding Activity

Global climate change and amphibian decline are two major phenomena that have received considerable media and research attention in recent years, and both could profoundly affect biodiversity within aquatic ecosystems.  Amphibian breeding activity is closely tied to weather.  However, the specifics of these relationships are largely unknown.  Southern Research Station scientists are currently studying the effects of rainfall and temperature on the breeding activity of 13 species of frogs in eastern Texas.  This information is critically important to predict the potential effects of a changing climate on frog populations. Given the high level of frog diversity in eastern Texas and the high seasonal variation in temperature and rainfall there, it was hypothesized that weather would be a major factor influencing frog behavior.  Indeed, weather played a critical role in frog breeding activity, with species responding in unique ways to changes in rainfall and temperature.  Based on season, weather, and frog calling activity, these 13 species were grouped into five breeding strategies: (1) summer breeders that appear to breed independent of local weather patterns; (2) summer breeders that are dependent on local rainfall to initiate breeding; (3) winter breeders that are dependent on warmer periods for breeding; (4) year-round breeders that rely on rainfall events in the summer and warm periods in the winter; and (5) species that are dependent on flood events (rainfall greater than 4 inches) to stimulate breeding. Daniel Saenz (dsaenz@fs.fed.us)
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Advanced Technology Used to Monitor Forest Change

Many forest changes are lost in the background at a distance, but an isolated change may be part of a broader pattern when viewed from afar. Finding a proper balance between detail and perspective challenges those who monitor forest conditions over broad areas. Station scientists at the Eastern Forest Environmental Threat Assessment Center have teamed up with NASA’s Stennis Space Center, Oak Ridge National Laboratory, and other FS technology centers to develop an early warning system that uses multiple sensors operating at multiple scales. Advanced computer algorithms on supercomputers create a composite map every eight days.  Every 500 square-meter pixel in the map is categorized using explicit information about topography and climate in addition to MODIS values.  By comparing a pixel with its previous states, one can detect unexpected transitions. Multiple shifts or a recognizable pattern could trigger additional examination by specialized airborne sensors or ground crews.   NASA is currently testing hyperspectral sensors for this purpose. William H. Hargrove (whargrove@fs.fed.us)
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A New Phase Change in Landscape Dynamics

Most human impacts on forests and grasslands are mediated by land-use changes that occur as a result of population increases and new home construction in undeveloped areas or semi-natural landscapes.  In order to understand these changes and predict future impacts on amenities like biodiversity and water quality, landscape ecologists need reliable reference standards to compare with observed patterns. Such standards need to take into account certain types of phase changes (abrupt shifts in the state of an ecosystem) that can occur as land-use intensifies in a given area.  In the past, percolation theory has provided a rigorous basis for interpreting changes in popular measures of habitat quality such as average forest patch size and forest connectivity across a landscape.  Southern Research Station scientists at the Eastern Forest Environmental Threat Assessment Center (EFETAC) and the European Commission have identified a new type of phase change that occurs as habitat edges switch abruptly from interior to exterior edges.  This contextual phase change occurs at levels of land-use change that are much lower than that reflected in percolation indices, which improves the sensitivity with which land-use changes in forested and grassland landscapes are measured. Kurt Riitters (kriitters@fs.fed.us)
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Data Query Tool for Invasive Plant Inventory on FIA Plots

In 2001, the SRS Forest Inventory and Analysis (FIA) program started systematically surveying FIA plots for the presence and relative abundance of more than 25 non-native invasive plants. Because this information has been collected regionally, the data have not been publicly available through the national FIA data Web site. However, a new tool that has been made available through the SRS FIA Web site (http://srsfia2.fs.fed.us)/nonnative_invasive/Southern_Nonnative_Invasives.htm) now enables users of FIA data to access data on non-native invasive plant occurrence on forestland by county.  Other details also are provided to enable knowledgeable individuals to map, model, and analyze these regional observations in combination with tree, forest condition, and plot attributes from the national FIA Web site.  Potential users include the US Geological Survey’s National Biological Information Infrastructure and the National Institute of Invasive Species Science, FS Forest Health Protection and other Federal agencies, The Nature Conservancy’s NatureServe, and State and regional exotic pest plant councils. Ray Sheffield (rsheffield@fs.fed.us) and Ted Ridley (tridley@fs.fed.us)
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Timber Product Output (TPO) in the South in 2005

The South’s forest industry is a multi-billion dollar economic engine that employs hundreds of thousands of employees across the region.  In most southern States, forest industry ranks in the top three manufacturers of industrial products.  The southern States account for nearly 60 percent of the Nation’s total timber product output.  The SRS Forest Inventory and Analysis (FIA) unit and the State forestry agencies across the South have completed the 2005 forest industry surveys for roundwood harvest and consumption in the southern US. The study shows that industrial TPO in the southern States jumped from 8.2 to 8.7 billion cubic feet between 2003 and 2005. Softwood product output was up 6 percent to 6.4 billion cubic feet and accounted for nearly three-quarters of total product output.  In August, the 2005 TPO data was made available at the FIA website, at http://srsfia2.fs.fed.us)/php/tpo2/tpo.php. This information will be used not only by the State forestry agencies but also by forest industry analysts and economists, university personnel, and individuals interested in how the forest resource is being utilized. The annual Southern Pulpwood report for 2005 has been published.  Individual State-level TPO assessments for 2005 will be published during the next FY. Tony Johnson (tjohnson09@fs.fed.us)
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Defining Socially-Optimal Fuel Programs

One of the most important and elusive issues regarding fire management is defining the “best” amount of fuel treatments to apply to a forested landscape.  The definition of optimal treatments is difficult because: (1) the effectiveness of treatments are difficult to measure and vary over time, (2) treatment costs are variable and are influenced by the scale of operations, (3) the damages from fire, which span timber, human health, tourism, and personal property losses, are complex and depend on the region, and (4) future fire occurrences are inherently uncertain. Station researchers have, over the course of five years, completed a series of studies to address each of the elements of this large question, and for the first time, have provided a complete answer. Using data on forest resources, meteorology, fire occurrence, and economic impacts within a probabilistic modeling framework, they have built a state-of-the-science assessment of prescribed burning to address how prescribed fire programs affect total social welfare at a broad scale. Their capstone analysis, applied to Volusia County in Florida, defines the optimal prescribed burning regime for a broad range of potential fire scenarios. The results indicate that, not only does the current prescribed burning regime generate gains in social welfare, but that these gains would exceed the costs of burning for a considerable expansion in the prescribed burning program.  While landowners currently burn about 4-5 percent of forests per year, the socially optimal treatment is approximately 13 percent of forests per year. Jeff Prestemon (jprestemon@fs.fed.us)
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Production and Costs of Biomass Removal from National Forest Lands

The National Forests in Alabama are seeking non-traditional ways to remove unmerchantable material to reduce fuels and improve forest health and wildlife habitat.  Two Districts, the Shoal Creek and the Oakmulgee, have implemented biomass removal projects to explore new methods of accomplishing their land management goals.  In 2006, biomass was chipped and delivered to a pulp mill for fuel chips.  Building on the success of that project, a new collaborative project was initiated with support from the FPL Biomass Grants program.  The new study is examining thinning and processing as feedstock for co-milling in coal-fired power plants.  A key obstacle has been to find appropriate in-woods processing equipment that would produce acceptable chip material for the power plant.  A prototype chipping machine was developed by a manufacturer specifically to create small “chips”.  Southern Station researchers are studying the production rates and costs of chipping and grinding this unmerchantable material into an energy product with the new machine as a potential cost-effective alternative to mulching, piling, or burning the material. Dana Mitchell (danamitchell@fs.fed.us)
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Examination of Differences between African American Visitation to National Forests in the South and Hispanic Visitation to National Forests in the Southwest

Recent data from the Forest Service’s on-site National Visitor Use Monitoring Survey (NVUM) shows that visits made by African Americans to national forests in the South account for very low visitation percentages in the region. This is surprising given that African Americans are highly concentrated in the South, and that both rural and urban black populations live proximal to national forests in several southern States.  In contrast, Hispanic visits to national forests in the Southwest are high, relative to their population proportion. We examined additional national level household data from the National Survey on Recreation and the Environment (NSRE) relating to awareness of Federal lands and management to help understand the discrepancy between Hispanic and Black recreational use of Federal lands.  We hypothesized that awareness of Federal agencies, knowledge of management objectives, and attitudes about user fees would explain Black/Hispanic visitation differences; however, strong differences remained after accounting for these factors. To help understand these differences, more precise data may be obtained from both institutional and personal factors, including regional differences in agency support for visitor diversity; sub-cultural values as they relate to wild land places; and private land ownership in each region for the respective groups. C. Y. Johnson (cjohnson09@fs.fed.us)
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Southern Biofuels Assessment Program

Woody biomass is primarily a raw material for either structural wood-based composites or as a thermal feedstock for the generation of energy. One of the ways energy can be recovered from wood is by a thermochemical process in which wood particles are subjected to extremely high temperatures in an anaerobic environment. This process yields synthesis gas (“syngas”) that is a mixture of methane, hydrogen, carbon monoxide, and carbon dioxide.  Syngas can be used as a gaseous fuel or as the starting material in a secondary reaction that yields liquid transportation fuels such as ethanol, gasoline, or diesel. There exists two basic obstacles to the production of bioenergy from woody biomass:  (1) the lack of information regarding the chemical and physical composition of woody biomass from southern forests and plantations; (2) lack of efficient conversion technologies. Southern Research Station scientists are undergoing an extensive study over the next 5-year period that will investigate three areas of bioenergy research. The first area will be woody raw material characterization, done in conjunction with other work such as forest genetics, tree breeding and physiology research with genomics technology to determine the effects of specific genes and gene combinations on bioenergy traits and overall feedstock performance.  Secondly, we will evaluate the efficacy of various conversion techniques (gasification, pyrolysis, fermentation) in relation to the chemical/physical composition of the woody biomass. Finally, we will evaluate the impact of biomass removals on fuels loading, soil quality, water quality, and forest ecosystem health. Les Groom (lgroom@fs.fed.us)
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Recreation Visits to Wilderness and Primitive Areas

Station researchers, using data from the Census, the National Visitor Use Monitoring Project, and the National Survey on Recreation and the Environment developed models to examine national participation and use of wilderness and primitive areas for outdoor recreation. Their findings corroborated previous studies suggesting that racial minorities, immigrants, urbanites, and females participate less in primitive area recreation. In related work, they examined the relationship between visitation and personal, structural, and psychological constraints to wildland recreation use. Seventeen structural, personal, and psychological constraints related to health, facilities, socioeconomic standing, and other personal factors were examined using regression methods. Results revealed minorities, women, lower levels of income and education, and elderly populations were more likely to perceive they were significantly constrained from visiting wilderness.  Using Census data and estimated models, the researchers projected future participation and use in order to assess recreation pressure on wildlands.  In general, their findings indicate that over the next 40 years, wildland recreation users and use will increase but at a rate less than general population growth.  In fact, per capita participation in wildland recreation is expected to drop more than 15 percent.  Nevertheless, when combined with a nearly 50 percent increase expected in the general population, a net increase in participants of about 25 percent and about a 20 percent increase in wildland site visits annually.  Furthermore, if management and acculturation can influence a reduction in perceived constraints by certain demographics, the increases are likely to be greater. The increase in site visits combined with a dwindling amount of wildland acreage due to development pressures  will present challenges to land managers and to the Agency’s goal of providing  high-quality outdoor recreation opportunities while sustaining natural system quality. J. M. Bowker (mbowker@fs.fed.us)
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National Leader in Recreation Research

For over 30 years the Forest Service and the Recreation Research Unit in Athens, Georgia has been a recognized leader in forming partnerships to address needs for information and technology to support better policy and management of public lands.  This on-going partnership has involved multiple Federal agencies, State associations, private associations and universities.  Projects have included the Federal Estate Visitors Survey, the Public Area Recreation Visitors Survey, the Customer Use Survey, the National Visitor Use Monitoring Survey, the National Recreation Survey, and most recently the National Survey on Recreation and the Environment (NSRE).  The NSRE involves the Forest Service, National Oceanic and Atmospheric Administration, the Environmental Protection Agency, the United States Coast Guard, the National Park Service, the Bureau of Land Management, other Federal agencies, the National Association of Recreation Resource Planners, the University of Georgia, the University of Tennessee, and the State University of New York. H. Ken Cordell (kcordell@fs.fed.us)
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Other Accomplishments

Long-term Soil Productivity Can Be Maintained Under Intensive Timber Management

Intensive harvesting can deplete soil nutrient resources and compact or disturb surface soils, causing productivity and ecosystem health to decline. However it hasn’t been clear what levels are critical for various soils. Recent results in long-term soil productivity research in several Southern states (including Texas) indicate that soil compaction may not reduce productivity on moderately well drained soils in the Western Gulf coastal plain. Although productivity of infertile soils may be reduced by whole-tree harvesting, applying fertilizer improved site productivity and was energy efficient.

Applied Silvicultural Assessment for Southern Pine Beetle

SRS scientists and University cooperators are developing landscape-based computer models to quantify the likelihood of forests being attacked by southern pine beetle. The models draw on our understanding of how modern silvicultural practices in southern pine stands affect susceptibility to this bark beetle at the landscape scale. These web-based tools will allow landowners and foresters to make better decisions about the intensity and timing of silvicultural practices to minimize hazard and risk from southern pine beetle.
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Forest Inventory and Analysis

Researchers in the FIA unit have been conducting annual inventories in cooperation with the Georgia Forestry Commission since 1998. A total of $549,898 was provided to the State for annual inventory field data collection. A five-year report is being developed. Inventory data is available electronically through 2005.
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