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An Assessment of the Use of Seeding, Mowing, and Burning in the Restoration of an Oldfield to Tallgrass Prairie in Lewisville, Texas
An examination of the effectiveness of seeding, burning, and mowing in the reestablishment of tallgrass prairie species on overgrazed and abandoned pastureland. The study site is a 20 acre tract on U.S. Corps of Engineers land below Lake Lewisville in Denton County, Texas. The site was partitioned into thirty-nine 40 by 40 meter plots with seeding (carried out in 1996) and management treatment (burning, mowing, and no maintenance carried out in 1998) randomly applied following a two level design. For each plot, nine stratified-random 0.1 m2 subplots were examined and shoot counts for each species recorded. The effects of the treatments on individual species and species richness were analyzed with a two-way ANOVA followed by a SNK multiple range test, both on ranked data. Community level analysis was conducted with both a MANOVA on ranked data and a Canonical Correspondence Analysis on raw data. Results indicate that seeding positively affected species richness, particularly when combined with either burning or mowing in the early spring. Mowing also significantly increased species richness in areas that were not seeded, while burning negatively affected species richness on unseeded plots. Treatments significantly affected community composition with treatments having the most clear effect on spring and …
Date:
August 1999
Creator:
Windhager, Steven
System:
The UNT Digital Library
Assessing the Spatial and Temporal Distribution of MTBE and BTEX Compounds in Lake Lewisville, Texas February 1999 - February 2000
The spatial and temporal distribution of Methyl Tertiary-Butyl Ether (MTBE) and BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) compounds were assessed in a multipurpose reservoir, Lake Lewisville, Texas between February 1999 and February 2000. Concentrations of MTBE ranged from 0.0 - 16.7 mg/L. Levels of MTBE in the lake were related to watercraft. BTEX concentrations were never detected above 2.0 mg/L during the sampling period. Finished drinking water from Denton and the Upper Trinity Regional Water District (UTRWD) Treatment Plants were also tested for MTBE and BTEX. MTBE and BTEX were not detected in UTRWD water samples. Denton's finished water samples never exceeded 2.2 mg/L for MTBE and BTEX was not detected except for one replicate of 1.1 mg/L toluene.
Date:
August 2000
Creator:
Lee, Anne W.
System:
The UNT Digital Library
Characterizing the Municipal Solid Waste Stream in Denton, Texas
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Use of this item is restricted to the UNT Community
Forty-two commercially collected dumpsters from DentonÂ’s Municipal Solid Waste Stream were emptied, sorted and weighed to characterize the material types and make preliminary recycling policy recommendations. The general composition of DentonÂ’s solid waste stream was not significantly different from the composition of the nationÂ’s solid waste stream. Fifty-eight percent of the observed waste stream was recyclable. Paper made up the largest portion of recyclable materials and the "grocery" source category had more paper than any of the other five categories. Based on these findings, an incrementally aggressive approach is recommended to reduce certain types of wastes observed in the waste stream. This would include a Pay-As-You-Throw Program followed by an Intermediate Processing Center that can be converted to a Materials Recovery Facility.
Date:
August 2000
Creator:
Brady, Patricia D.
System:
The UNT Digital Library
Recovery of the Fish Population of a Municipal Wastewater Dominated, North Texas Creek After a Major Chlorine Disturbance
This study evaluated the effects of a major chlorine disturbance on fish communities in Pecan creek by the City of Denton's Pecan Creek Water Reclamation Plant. Fish communities in Pecan Creek were sampled using a depletion methodology during February, April, July, and November, 1999. February and April sampling events showed that the fish communities were severely impacted by the chlorine. Sampling during July and November showed fish communities recovered in Pecan Creek. The first-twenty minutes of shocking and seining data were analyzed to mirror an equal effort methodology. This methodology was compared to the depletion methodology to see if the equal effort methodology could adequately monitor the recovery of Pecan Creek after the chlorine disturbance. It was determined that the equal effort methodology was capable of monitoring the recovery of Pecan Creek, but could not accurately represent the fisheries community as well as the depletion method. These data using the twenty-minute study were compared to a previous study. Results of this study were similar to those found in a previous study, although fish communities were more severely impacted and took longer to recover.
Date:
August 2002
Creator:
Maschmann, Gerald F.
System:
The UNT Digital Library
Bacterial Survey of Representative Denton County Wells with Special Reference to Sanitation
This thesis aimed to study the seventy-two representative wells of Denton County and to determine the possibilities of infection with typhoid organism. The sanitary survey and the test for Colon-Aerogenes bacteria show that 55% of the 72 wells studied are unsanitary, 27% are sanitary, and 18% are doubtful.
Date:
June 1937
Creator:
Roberts, Sally Stevens
System:
The UNT Digital Library
County Level Population Estimation Using Knowledge-Based Image Classification and Regression Models
This paper presents methods and results of county-level population estimation using Landsat Thematic Mapper (TM) images of Denton County and Collin County in Texas. Landsat TM images acquired in March 2000 were classified into residential and non-residential classes using maximum likelihood classification and knowledge-based classification methods. Accuracy assessment results from the classified image produced using knowledge-based classification and traditional supervised classification (maximum likelihood classification) methods suggest that knowledge-based classification is more effective than traditional supervised classification methods. Furthermore, using randomly selected samples of census block groups, ordinary least squares (OLS) and geographically weighted regression (GWR) models were created for total population estimation. The overall accuracy of the models is over 96% at the county level. The results also suggest that underestimation normally occurs in block groups with high population density, whereas overestimation occurs in block groups with low population density.
Date:
August 2010
Creator:
Nepali, Anjeev
System:
The UNT Digital Library
A Survey of the Physical Education Programs for Girls in the Affiliated Schools within a Radius of Sixty Miles of Denton Texas
A survey of the physical education programs for high school girls near Denton, Texas to determine the extent of compliance with state law for physical education, the facilities for the program, training of the teachers, type of physical education program, and teaching load of physical education teachers.
Date:
June 1939
Creator:
Morriss, May
System:
The UNT Digital Library
A Correlation of Humus with Water Content and Crop Rotation in San Saba and Denton Clays, Denton County, Texas
A study of the humus content and the water content of San Saba clay and Denton clay. Studies show that the physical properties of soil are conducive to moisture retention and the availability of moisture to plants.
Date:
August 1939
Creator:
Culwell, John Walton
System:
The UNT Digital Library
Evaluation of School Units that Affected the Community
This study examines a change from traditional to modern teaching in the Denton, Texas public schools. Issues faced by adminitation and teachers in three examined elementary schools provide information about the implementation of a plan focused on the particular needs of children in the community.
Date:
June 1939
Creator:
Yarbrough, James Lafayette
System:
The UNT Digital Library
Correlation of Humus and Water Content on Saba Clay, Denton, Texas
This study is an attempt to determine the relationship between humus and the water found in it and how both effect soil in Denton county, Texas.
Date:
August 1938
Creator:
Wilson, Clyde Byron
System:
The UNT Digital Library
A Chemical Analysis of Yellow Dent Corn
This study examines history, climate, and distribution in relation to the chemical content of yellow dent corn.
Date:
August 1939
Creator:
Hamby, R. B.
System:
The UNT Digital Library
An Evaluation of the Hebron School, Hebron, Texas
This thesis presents the results of an examination of the Hebron, Texas public schools. Specific criteria, such as home life and socioeconomic background, were used to consider the abilities and needs of students. The resulting information made it possible to determine the ability of schools to impact the lives of students.
Date:
August 1939
Creator:
Masters, Walter F.
System:
The UNT Digital Library
The Influence of Goal Seeking on Pupil Achievement in the Second Grade
This thesis is a comparison and result evaluation of arithmetic, handwriting, spelling, and reading goals by students in the second grade at Sam Houston Elementary School in Denton, Texas.
Date:
August 1940
Creator:
Gibbins, Una
System:
The UNT Digital Library
Some Problems of Conflict Between High School Pupils and their Parents
This thesis presents the findings of research conducted to discover the common sources of conflict between parents and teenagers. Data for the findings came from questionnaires completed by high school students in Denton and Greenville, Texas.
Date:
August 1940
Creator:
Gray, William Excell
System:
The UNT Digital Library
A Personnel Study of Members of Football Teams of the North Texas State Teachers College from 1930-31 through 1938
This study presents indicates the education, sport, and extra-curricular activities that football players participated in from 1930 to 1938.
Date:
August 1940
Creator:
Killian, L. W.
System:
The UNT Digital Library
A Chemical Investigation of Lake Dallas to Determine the Factors Influencing Plankton Growth.
A study to determine the organic content of Lake Dallas, and study the influence on plankton growth.
Date:
August 1939
Creator:
Welch, Herschel
System:
The UNT Digital Library
The Relation Between Certain Home Factors and the Social and Academic Progress of the Second-Grade Pupils in the Robert E. Lee School, Denton, Texas
The correlation between home environment and educational performance is addressed in this study.
Date:
August 1940
Creator:
Parnell, J. D.
System:
The UNT Digital Library
A Critical Analysis of a Method of Understanding Children
This study was undertaken in order to improve the human relations in the classroom.
Date:
1946
Creator:
Minick, Winnie Mallow
System:
The UNT Digital Library
The Incidence of Colon Bacteria on the Hands of North Texas State Teachers College Students
This investigation has for its aim the determination, in a measure, of the degree of personal sanitation existent among students at North Texas State Teachers College, Denton, Texas.
Date:
1946
Creator:
Hooper, Eugene
System:
The UNT Digital Library
Composition and Distribution of the Vegetation in Farm Pastures in Denton County, Texas
This investigation has for its aim the determination and the evaluation of the vegetational composition in certain farm pastures in Denton County, Texas.
Date:
1946
Creator:
Parker, Robert S.
System:
The UNT Digital Library
Responsibility of the Secondary School for the Social Development of its Students
The problem in this study is twofold. First, there will be an attempt to determine the values that organizations in the secondary school have for the development of its students. Second, a survey will be made of the four-year accredited high schools in District Five of Texas to determine how and to what extent they are realizing their responsibilities in this respect.
Date:
1947
Creator:
Baxter, Billie Otella
System:
The UNT Digital Library
Nitrogen Metabolism of College Women on Self-Selected Diets
The purpose of the present study is to determine the nitrogen intake and output (in both urine and feces) of two groups of Texas college women living in the Home Management House at North Texas State College.
Date:
1947
Creator:
Boshart, Gayle Jewel
System:
The UNT Digital Library
Study of Some Factors Related to Mutual Friendship on the High School Level
This study has been made for the purpose of determining the similarities and dissimilarities in certain factors related to mutual friendships.
Date:
1945
Creator:
Averitt, Lois Jane
System:
The UNT Digital Library
Dark Adaptation of Second and Third Grade Children
The purpose of the study is to determine the dark adaptation of second grade children in Denton, Texas.
Date:
1940
Creator:
Rohrer, Lois Young
System:
The UNT Digital Library