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Articles 61 - 90 of 125
Full-Text Articles in Life Sciences
Analyzing Spring Freeze Impacts On Deciduous Forest Productivity Using Modis Satellite Imagery, Karl Lintvedt
Analyzing Spring Freeze Impacts On Deciduous Forest Productivity Using Modis Satellite Imagery, Karl Lintvedt
Graduate Theses and Dissertations
The impacts of an April 2007 spring freeze event on the productivity of deciduous broadleaf forest were analyzed using geographic information system (GIS) tools. Forest productivity was modeled using the Enhanced Vegetation Index (EVI), as recorded by the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite sensor. Measures of spatial autocorrelation were used to quantify the degree of spatial congruence between a map depicting the severity of the freeze event, and maps modeling forest productivity throughout the year. The results show a geographic correlation between the unseasonably low minimum temperatures sustained during the freeze and the unusually low forest productivity that followed. …
Modeling Loblolly Pine Aboveground Live Biomass In A Mature Pine-Hardwood Stand: A Cautionary Tale, D. C. Bragg
Modeling Loblolly Pine Aboveground Live Biomass In A Mature Pine-Hardwood Stand: A Cautionary Tale, D. C. Bragg
Journal of the Arkansas Academy of Science
Carbon sequestration in forests is a growing area of interest for researchers and land managers. Calculating the quantity of carbon stored in forest biomass seems to be a straightforward task, but it is highly dependent on the function(s) used to construct the stand. For instance, there are a number of possible equations to predict aboveground live biomass for loblolly pine (Pinus taeda) growing in southeastern Arkansas. Depending on stem diameter at breast height (DBH), biomass varied considerably between four different prediction systems for loblolly pine. According to the tested models, individual tree oven-dry biomass for a 50 cm DBH loblolly …
Accuracy And User Variation Associated With Slope Measurement Using A Laser Hypsometer, C. Hastings, R. C. Weih Jr., H. O. Liechty, R. Harris
Accuracy And User Variation Associated With Slope Measurement Using A Laser Hypsometer, C. Hastings, R. C. Weih Jr., H. O. Liechty, R. Harris
Journal of the Arkansas Academy of Science
Slope measurements are often necessary for assessing features and processes within the natural environment. Land managers often use handheld equipment rather than more complicated surveying equipment in order to measure slopes and to conduct field work efficiently. One type of handheld device used to measure slope is a laser clinometer. In order to determine the accuracy and user error associated with this type of clinometer, slope measurements were taken at multiple locations using two types of equipment: 1) a Haglof Sweden Vertex III Hypsometer with a laser clinometer function and 2) a Topcon GTS-603/AF electronic survey total station which can …
Economic Contribution Of The Agricultural Sector To The Arkansas Economy In 2008, Jennie Popp, Nathan Kemper, Wayne Miller, Katherine Mcgraw, Kyle Karr
Economic Contribution Of The Agricultural Sector To The Arkansas Economy In 2008, Jennie Popp, Nathan Kemper, Wayne Miller, Katherine Mcgraw, Kyle Karr
Research Reports and Research Bulletins
This report is the fifth in a series of reports examining agriculture’s economic contribution to the Arkansas economy. Utilizing data from the United States Bureau of Economic Analysis (BEA), USDA Economics Research Service (ERS), USDA National Agricultural Statistics Service (NASS), and Minnesota IMPLAN Group, Inc. (MIG), the economic contribution of agriculture on the Arkansas economy was estimated for the most recent year available, 2008. Gross Domestic Product (GDP) by State information for Arkansas was compared with those of other states in the southeast U.S. to give a measure of the relative importance of agriculture in Arkansas.2 The total economic contribution …
Stand Conditions Immediately Following A Restoration Harvest In An Old-Growth Pine-Hardwood Remnant, Don C. Bragg
Stand Conditions Immediately Following A Restoration Harvest In An Old-Growth Pine-Hardwood Remnant, Don C. Bragg
Journal of the Arkansas Academy of Science
Portions of the Levi Wilcoxon Demonstration Forest (LWDF), a privately owned parcel of old growth pine and hardwoods in Ashley County, Arkansas, were recently treated to restore conditions similar to some historic accounts of the virgin forest. Following a hardwood-only cut, a post-harvest inventory showed that the number of tree species in the sample area declined from 24 in 2006 (the most recent pre-harvest inventory) to 12 in 2009. Loblolly (Pinus taeda L.) and shortleaf (Pinus echinata Mill.) pine now comprise 59.2% of the remaining live trees, up from 16.2% in 2006. Between 2006 and 2009, basal area dropped from …
Economic Contribution Of The Agricultural Sector To The Arkansas Economy In 2007 And Revised Estimates For 2006, Nathan Kemper, Jennie Popp, Wayne Miller
Economic Contribution Of The Agricultural Sector To The Arkansas Economy In 2007 And Revised Estimates For 2006, Nathan Kemper, Jennie Popp, Wayne Miller
Research Reports and Research Bulletins
This report is the fourth in a series of reports examining agriculture’s economic contribution on the Arkansas economy. Utilizing data from the United States Bureau of Economic Analysis, USDA Economics Research Service, USDA National Agricultural Statistics Service, and Minnesota IMPLAN Group, Inc., the economic contribution of agriculture on the Arkansas economy was estimated for the most recent year available, 2007. Gross Domestic Product (GDP) by State information for Arkansas was compared with those of other states in the southeast U.S. to give a measure of the relative importance of agriculture in Arkansas. The total economic contribution of agriculture (direct, indirect, …
Letter From The Dean, Lalit Verma
Letter From The Dean, Lalit Verma
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
No abstract provided.
Comparison Of Pine Height Models For The Crossett Experimental Forest, Don C. Bragg
Comparison Of Pine Height Models For The Crossett Experimental Forest, Don C. Bragg
Journal of the Arkansas Academy of Science
Many models to predict tree height from diameter have been developed, but not all are equally useful. This study compared a set of height-diameter models for loblolly (Pinus taeda) and shortleaf (Pinus echinata) pines from Ashley County, Arkansas. Almost 560 trees ranging in diameter at breast height (DBH) from 0.3 cm (both species) to 91.9 cm (for shortleaf) or 108.2 cm (for loblolly) were chosen for measurement. Height equations were then fit to four different functions (Chapman-Richards, modified logistic, exponential, and Curtis-Arney) with weighted nonlinear least squares regression using DBH as the only predictor. Models were evaluated using a series …
Compatible Stem Taper And Total Tree Volume Equations For Loblolly Pine Plantations In Southeastern Arkansas, C. Vanderschaaf
Compatible Stem Taper And Total Tree Volume Equations For Loblolly Pine Plantations In Southeastern Arkansas, C. Vanderschaaf
Journal of the Arkansas Academy of Science
A system of equations was used to produce compatible outside-bark stem taper and total tree volume equations for loblolly pine (Pinus taeda L.) plantations in southeastern Arkansas. Paired height diameter stem measurements were obtained from trees located in one 45-year-old unthinned plantation. After fitting and integrating the stem taper equation to total tree height, an individual tree constant form factor volume equation was obtained. The stem taper equation can also be integrated to any merchantable height to obtain merchantable volume. To see how the constant form factor volume equation predicts outside bark volume for trees vastly different than those used …
Historical Forest Landscape Changes In The Buffalo River Sub-Basin In Arkansas, Robert C. Weih Jr., A. Dick
Historical Forest Landscape Changes In The Buffalo River Sub-Basin In Arkansas, Robert C. Weih Jr., A. Dick
Journal of the Arkansas Academy of Science
Forested areas in the United States have been altered since the time of European settlement. For this reason, research interests have increased in comparing present day vegetation with that of the preEuroamerican era to see what changes, if any, have occurred in some of our more outstanding natural areas. Such studies have been conducted in other parts of the United States but limited research has been done in Arkansas. The General Land Office (GLO) surveys of Arkansas were originally conducted between approximately 1815 and 1850 shortly after Arkansas was acquired from France by means of the Louisiana Purchase and provides …
Impact Of The Agricultural Sector On The Arkansas Economy In 2003, Jennie Popp, Nathan Kemper, Wayne Miller
Impact Of The Agricultural Sector On The Arkansas Economy In 2003, Jennie Popp, Nathan Kemper, Wayne Miller
Research Reports and Research Bulletins
Agriculture and associated agricultural activities are major contributors to the Arkansas economy. Agriculture is defined as the sum of agricultural production and processing activities, unless otherwise specified, and includes crop and animal production and processing, agricultural support industries, forestry and forest products, and textile goods. Agriculture contributes to the economy through direct agricultural production and value-added processing, and also leads to economic activity in other parts of the economy.
Effects Of Light Regime And Season Of Clipping On The Growthof Cherrybark Oak, White Oak, Persimmon, And Sweetgum Sprouts, Robert L. Ficklin, Michael G. Shelton
Effects Of Light Regime And Season Of Clipping On The Growthof Cherrybark Oak, White Oak, Persimmon, And Sweetgum Sprouts, Robert L. Ficklin, Michael G. Shelton
Journal of the Arkansas Academy of Science
A mixture of cherrybark oak (Quercus pagoda Raf.), white oak (Q. alba L.), persimmon (Diospyros virginiana L.), and sweetgum (Liquidambar styraciflua L.) seedlings was grown in shadehouses to simulate light conditions beneath a canopy. After the first growing season, two release treatments were implemented (released and not released), and treatments were conducted during two seasons (winter and spring). All seedlings were clipped at 2.5 em from the groundline in height when treatments were imposed. Survival of persimmon and sweetgum was 100% following clipping. There appeared to be a weak seasonal effect on oak survival, especially for white oak; survival was …
Five Years Of Change In An Old-Growth Pine-Hardwood Remnant In Ashley County, Arkansas, Don C. Bragg
Five Years Of Change In An Old-Growth Pine-Hardwood Remnant In Ashley County, Arkansas, Don C. Bragg
Journal of the Arkansas Academy of Science
The Levi Wilcoxon Demonstration Forest near Hamburg, Arkansas is an industrially-owned remnant of old-growth pine and hardwoods. Some of the loblolly (Pinus taeda L.)and shortleaf (Pinus echinata Mill.)pine in this stand are over 200 years old, and numerous individuals exceed 90 cm in diameter and 30 m in height. A2000 survey of a portion of this tract found that 27 tree species contributed an average of387.5 live stems/ha and 31.8 m2 /ha of basal area. An inventory of the same plots in2006 yielded noticeable declines in density (now down to 342.5 stems/ha) and basal area (now 28.2 m2 /ha). Much …
Impact Of The Agricultural Sector On The Arkansas Economy In 2001, Jennie Popp, Gina Vickery, H. L. Goodwin Jr., Wayne Miller
Impact Of The Agricultural Sector On The Arkansas Economy In 2001, Jennie Popp, Gina Vickery, H. L. Goodwin Jr., Wayne Miller
Research Reports and Research Bulletins
Agriculture has historically been one of Arkansas’ primary economic sectors. Agriculture is defined as the sum of agricultural production and processing activities unless otherwise specified. Agriculture contributes to the economy through direct agricultural production and value-added processing which generates economic activity in other parts of the economy.
Crown Radius And Diameter At Breast Height Relationships For Six Bottomland Hardwood Species, Brian Roy Lockhart, Robert C. Weih Jr., Keith M. Smith
Crown Radius And Diameter At Breast Height Relationships For Six Bottomland Hardwood Species, Brian Roy Lockhart, Robert C. Weih Jr., Keith M. Smith
Journal of the Arkansas Academy of Science
The relationship between a tree's crown radius and diameter at breast height (DBH) has a variety of uses including forest competition studies, tree crown densities, spacing and stocking relationships, wildlife habitat suitability models, and tree volume estimations. Estimating DBH from mean crown radius (MCR) is of interest to natural resource managers because MCR can be estimated from high resolution digital imagery using remote sensing techniques. DBH is a common tree dimensional characteristic that is used to quantify tree and stand structure. This research presents MCR/DBH and DBH/MCR relationships for boxelder (Acer negundo L.), sweet pecan (Carya illinoensis (Wang) K.Koch), sugarberry …
Presettlement Pinus Tadea Mississippi Valley Alluvial Plain Of The Monroe County, Arkansas Area, Don C. Bragg
Presettlement Pinus Tadea Mississippi Valley Alluvial Plain Of The Monroe County, Arkansas Area, Don C. Bragg
Journal of the Arkansas Academy of Science
No abstract provided.
Identifying The Factors Distinguishing Timber Sales On Industrial And Non-Industrial Private Forest Lands In Arkansas, Sayeed R. Mehmood, Prabudhda Dahal
Identifying The Factors Distinguishing Timber Sales On Industrial And Non-Industrial Private Forest Lands In Arkansas, Sayeed R. Mehmood, Prabudhda Dahal
Journal of the Arkansas Academy of Science
Although forests provide a wide variety of products and services, timber still continues to be the most valued forest product in the marketplace. More than two-third of the nation's forests are under private control, some are owned by industries (about 10%) while a much larger portion (about 59%) is owned by individuals. This study investigates the differences between timber sales offered by industrial and non-industrial ownerships. A test of means revealed that there is a significant difference between per hectare bid for these 2 types of sales. A logistic regression model was then estimated to identify important factors characterizing this …
Effects Of Herbicide Application Of Foliar Morphology And Nutrient Concentrations In Mid-Rotation Pine Plantations, Prabudhda Dahal, Hal O. Liechty
Effects Of Herbicide Application Of Foliar Morphology And Nutrient Concentrations In Mid-Rotation Pine Plantations, Prabudhda Dahal, Hal O. Liechty
Journal of the Arkansas Academy of Science
Application of herbicide to reduce competing brush and hardwood species is a common silvicultural activity in young loblolly pine (Pinus taeda) stands. A reduction in competition generally increases the amount of available resources to the loblolly pine crop trees thereby increasing foliage biomass, fascicle dimensions, and foliar nutrient concentrations. To what extent herbicide application and competition control alters these foliar characteristics in mid-rotation stands has rarely been reported. The purpose of this paper is to evaluate whether the application of herbicide alters the morphology, mass, and/or nitrogen concentration of mid-rotation loblolly pine foliage. We aerially applied an imazapyr herbicide to …
Historical Reflections On The Arkansas Cross Timbers, Don C. Bragg
Historical Reflections On The Arkansas Cross Timbers, Don C. Bragg
Journal of the Arkansas Academy of Science
Kiichler's original map of potential natural vegetation suggested that the eastern-most extension of the "Cross Timbers" oak-dominated woodland reached into extreme western Arkansas. Recent investigations have found possible old-growth Cross Timber communities in narrow strips along steep, rocky sandstone and shale ridges near Fort Chaffee and Hackett. However, many decades of Euroamerican intervention have altered vegetation composition and structure in west-central Arkansas, making field evaluation difficult. Fortunately, historical accounts of the area provide considerable supporting documentation. General Land Office surveyors, for instance, traversed this portion of western Arkansas before 1850. They reported many ridges and slopes dominated by grassy, stunted …
Stand-Level Green Biomass Equations For Sawtimber-Sized Loblolly Pine In Arkansas, Paul F. Doruska, David W. Patterson, Travis E. Posey
Stand-Level Green Biomass Equations For Sawtimber-Sized Loblolly Pine In Arkansas, Paul F. Doruska, David W. Patterson, Travis E. Posey
Journal of the Arkansas Academy of Science
Loblolly pine (Pinus taeda L.) is commercially the most important timber species in southern Arkansas and the southern United States. Results of stand-level timber inventories have traditionally been reported in terms of volume, yet loblolly pine sawtimber is bought and sold based on biomass. A straight forward stand-level conversion from volume per hectare to biomass per hectare does not exist for Arkansas, thus complicating the valuation of standing loblolly pine sawtimber. Two equations were developed to predict stand-level, outside-bark, green biomass per unit area for loblolly pine stands in southern Arkansas. The merchantable sawlog equation presented herein explained approximately 95% …
Quantifying Forest Ground Flora Biomass Using Proximal Sensing, Paul F. Doruska, Robert C. Weih Jr., Matthew D. Lane, Don C. Bragg
Quantifying Forest Ground Flora Biomass Using Proximal Sensing, Paul F. Doruska, Robert C. Weih Jr., Matthew D. Lane, Don C. Bragg
Journal of the Arkansas Academy of Science
Current focus on forest conservation and forest sustainability has increased the level of attention given to measures of ground flora in forest ecosystems. Traditionally, such data are collected via time- and resource-intensive methods of field identification, clipping, and weighing. With increased focus on community composition and structure measures of forest ground flora, the manner in which these data are collected must change. This project uses color and color infrared digital cameras to proximally sense forest ground flora and to develop regression models to predict green and dry biomass (g/m^) from the proximally sensed data. Traditional vegetative indices such as the …
Impact Of The Agricultural Sector On The Arkansas Economy, H. L. Goodwin Jr., Jennie Popp, Wayne Miller, Gina Vickery, Z. Clayton-Niederman
Impact Of The Agricultural Sector On The Arkansas Economy, H. L. Goodwin Jr., Jennie Popp, Wayne Miller, Gina Vickery, Z. Clayton-Niederman
Research Reports and Research Bulletins
Agriculture historically has been one of the primary sectors of the Arkansas economy. Agriculture is defined as the sum of agricultural, forestry, and fisheries production and processing activities unless otherwise specified. Not only does agriculture contribute to the economy through direct agricultural production and added value processing, it also plays an important role through the economy’s other sectors. Utilizing data from the United States Bureau of Economic Affairs and the State of Arkansas, the economic impact of agriculture on the Arkansas economy was estimated for the latest year available, 1999. Gross State Product (GSP) information for Arkansas was compared with …
Beetle Diversity In An Eastern Cottonwood (Populus Deltoides Bartr.) Plantation And Adjacent Bottomland Hardwood Forest In Southeastern Arkansas, Michael D. Warriner, T. Evan Nebeker, Steven A. Tucker
Beetle Diversity In An Eastern Cottonwood (Populus Deltoides Bartr.) Plantation And Adjacent Bottomland Hardwood Forest In Southeastern Arkansas, Michael D. Warriner, T. Evan Nebeker, Steven A. Tucker
Journal of the Arkansas Academy of Science
Within the Lower Mississippi Alluvial Valley (LMAV),some lands cleared of bottomland hardwood forests have the potential to return to forest as a result of private sector and government interests in Populus cultivation. Specifically, monoculture plantings of eastern cottonwood (Populus deltoides Bartr.) represent an important component of many recent afforestation efforts in the region. The impact establishment of such monocultures will have on native insect communities in the LMAV is relatively unknown. To evaluate this, beetle (Coleoptera) diversity, abundance, and functional distribution were examined within an intensively managed eastern cottonwood plantation and nearby bottomland hardwood forest in southeastern Arkansas. Beetles were …
Checklist Of Major Plant Species In Ashley County, Arkansas Noted By General Land Office Surveyors, Don C. Bragg
Checklist Of Major Plant Species In Ashley County, Arkansas Noted By General Land Office Surveyors, Don C. Bragg
Journal of the Arkansas Academy of Science
The original General Land Office (GLO) survey notes for the Ashley County, Arkansas, area were examined to determine the plant taxa mentioned during the 1818 to 1855 surveys. While some challenges in identifying species were encountered, at least 39 families and approximately 100 species were identified with reasonable certainty. Most references were for trees used to witness corners or lines. Prominent arboreal genera recorded in these early survey records included Quercus, Pinus, Carya, Liquidambar, Nyssa, Ulmus, Acer, Fraxinus, and Taxodium. A number of shrubs, vines, graminoids, and herbaceous species were also reported, including notable genera like Vaccinium, Lindera, Crataegus, Myrica, …
Decomposition Rate Comparisons Between Frequently Burned And Unburned Areas Of Uneven-Aged Loblolly Pine Stands In Southeastern Arkansas, Michele Renschin, Hal O. Leichty, Michael G. Shelton
Decomposition Rate Comparisons Between Frequently Burned And Unburned Areas Of Uneven-Aged Loblolly Pine Stands In Southeastern Arkansas, Michele Renschin, Hal O. Leichty, Michael G. Shelton
Journal of the Arkansas Academy of Science
Although fire has been used extensively over long periods of time in loblolly pine (Pinus taeda L.) ecosystems, little is known concerning the effects of frequent fire use on nutrient cycling and decomposition. To better understand the long-term effects of fire on these processes, foliar litter decomposition rates were quantified in a study investigating prescribed fire and uneven-aged loblollypine management in the Upper Coastal Plain in Arkansas. Part of the study area had been burned on a 2- to 3-year cycle since 1981, whereas another portion had not received any prescribed fires. Decomposition rates were determined by placing foliar litter …
Method To Predict The Potential Regional Long-Term Timber Supply Using Gis And Other Publicly Available Data, Jeffery Earl, Richard A. Kluender, Robert Brewington
Method To Predict The Potential Regional Long-Term Timber Supply Using Gis And Other Publicly Available Data, Jeffery Earl, Richard A. Kluender, Robert Brewington
Journal of the Arkansas Academy of Science
While the global demand for wood products is on the rise, timber production has shifted from the Pacific Northwest to the southeastern United States in recent times. The increase in harvesting makes accurate assessment of the South's wood supply essential. Anew method is proposed for looking at the potential supply of raw woody material. The test area was three southeastern Arkansas counties. A geographic information system (GIS) using ArcView software incorporates two sources of public information. First, Forest Inventory and Analysis (FIA) data from the USDA Forest Service were queried to find land areas and volumes by timber type, as …
Evaluation Of Three Types Of Forest Openings As Habitat For Wild Turkeys, Thomas A. Nelson
Evaluation Of Three Types Of Forest Openings As Habitat For Wild Turkeys, Thomas A. Nelson
Journal of the Arkansas Academy of Science
No abstract provided.
Effects Of Retained Pine And Hardwood Basal Areas On Percent Cover Of Plants Utilized By Bobwhite Quail, David G. Peitz, Philip A. Tappe, Michael G. Shelton
Effects Of Retained Pine And Hardwood Basal Areas On Percent Cover Of Plants Utilized By Bobwhite Quail, David G. Peitz, Philip A. Tappe, Michael G. Shelton
Journal of the Arkansas Academy of Science
Percent cover of seven forage species utilized by bobwhite quail (Colinus virginianus) was determined before thinning and 2 and 4 years after thinning a 35-year-old loblolly pine-hardwood stand. Combinations of three loblolly pine (15, 18, and 21 m2/ha) and three hardwood (0, 3.5, and 7 m2/ha) basal areas were replicated three times. Percent cover was determined for American beautyberry (Callicarpa americana), blackberry (Rubus spp.), tick trefoil (Desmodium spp.), lespedeza (Lespedeza spp.), panic grass (Panicum spp.), yellow wood sorrel (Oxalis stricta), and three-seeded mercury (Acalypha spp.). Percent cover of American beautyberry and blackberry increased with time. Tick trefoil and panic grass …
Variability In Forest Floor Mass And Nutrient Concentration Of Mature Pine-Hardwoods In The Ouachita Mountains, Hal O. Liechty, Michael G. Shelton, Edwin R. Lawson
Variability In Forest Floor Mass And Nutrient Concentration Of Mature Pine-Hardwoods In The Ouachita Mountains, Hal O. Liechty, Michael G. Shelton, Edwin R. Lawson
Journal of the Arkansas Academy of Science
Prior to timber harvesting, forest floor mass and nutrient concentrations in forest floor and mineral soil were determined in 24 mature, shortleaf pine (Pinus echinata Mill.)-hardwood stands occurring within the northern, eastern, southern and western sub-ecoregions of the Ouachita Mountains. The forest floor samples were collected at each of three locations representing the lower, mid, and upper slope positions within each stand. Samples of the L-(litter) and F-layers (fermentation) were collected separately. Materials from the L-layer were differentiated into hardwood foliage, pine foliage, and woody/reproductive components. Mass and nutrient concentrations of the various forest floor components were compared among slope …
Integrating Gis And Remote Sensing With Ecosystem Research, Suzanne Wiley, Robert C. Weih Jr.
Integrating Gis And Remote Sensing With Ecosystem Research, Suzanne Wiley, Robert C. Weih Jr.
Journal of the Arkansas Academy of Science
In the Phase II Ecosystem Management Research Program in the Ouachita and Ozark National Forests, an interdisciplinary group of scientists are evaluating the effects and trade-offs of partial cutting methods in a replicated stand level study. Information from approximately 2,000 plots is being collected by more than fifty researchers during this five-year project with plans to continue data collection long term. To evaluate the effects of different management strategies and their interactions with forest resources, data must be brought into a common format and made available to all researchers. To this end, a data support system was developed which utilizes …