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Articles 181 - 208 of 208
Full-Text Articles in Entire DC Network
Root-Length Densities Of Lentil And Wheat And Measuring Infiltration In The Soil In Differentsoil Tillage, Lentil-Wheat Versa Fallow-Wheat Rotation Systems Undercentral Anatolian Conditions, Didar Eser, M. Sait Adak, Andreas Biesantz
Root-Length Densities Of Lentil And Wheat And Measuring Infiltration In The Soil In Differentsoil Tillage, Lentil-Wheat Versa Fallow-Wheat Rotation Systems Undercentral Anatolian Conditions, Didar Eser, M. Sait Adak, Andreas Biesantz
Turkish Journal of Agriculture and Forestry
The research was carried out for four years in the two locations Haymana-Ankara and Gözlü-Konya under different climate characteristics of the Central Anatolian Region. The aim of the reseach was to improve soil fertility in dry farming areas and to increase the benefit from fallow areas. Different soil tillage treatments and lentil-wheat versa fallow- wheat rotations systems resp. were examined in these experiments. According to experimental results highest root-length densities (RLD s ) of winter sown lentils were obtained in soil layers of 0-20 and 20-40 cm in comparison to deeper soil layers of 20 cm each down to 1 …
Ecology Of The Eastern Cottonmouth (Agkistrodon P. Piscivorus) At Back Bay National Wildlife Refuge: A Comparative Study Of Natural And Anthropogenic Marsh Habitats, Chad Lee Cross
Biological Sciences Theses & Dissertations
Mark-recapture sampling and radiotelemetry were used to investigate populations of the eastern cottonmouth, Agkistrodon p. piscivorus, in both natural and anthropogenic marsh habitats at Back Bay National Wildlife Refuge (BBNWR), Virginia Beach, Virginia from autumn 1995 to late spring 1998. Mark-recapture subjects were captured, marked by ventral scale-clipping, and released back into the population. A modified Schnabel Census estimator was used to estimate population sizes and corresponding densities in both marsh systems based on a total of 244 captures of 222 individuals. Most snakes were found >0.05 in from water, but it was apparent that proximity to water played …
Species Pools Of Seed Plants In Eastern Asia And North America, Shiyou Li, Kent T. Adair
Species Pools Of Seed Plants In Eastern Asia And North America, Shiyou Li, Kent T. Adair
eBooks
"In their monograph, Species Pools of seed plants in Eastern Asia and North America, Drs. Li and Adair present a comprehensive analysis of data collected during a ten-year study involving 10,000 plant species in east Asia and North America."
Plant Community Changes Over 54 Years Within The Great Basin Experimental Range, Manti-La Sal National Forest, Scott C. Walker, David K. Mann, E. Durant Mcarthur
Plant Community Changes Over 54 Years Within The Great Basin Experimental Range, Manti-La Sal National Forest, Scott C. Walker, David K. Mann, E. Durant Mcarthur
Aspen Bibliography
Plant community changes and natural succession over time impact forage values, watershed quality, wildlife habitat, and ecosystem dynamics. Comparisons were made between a vegetation map of community types completed in 1937 by the U.S. Forest Service, and vegetation maps compiled in 1990 of the same areas by satellite imagery, and through 1991 areal photo interpretation combined with ground truthing. The study area includes nearly all of the drainage in Ephraim Canyon located in central Utah which consists of 6,027 acres (2,439 ha). Elevation ranges from 6,600 to 10,400 feet (2,040 to 3,210 m). Vegetation types ranged from pinyon-juniper woodland through …
Comparative Gas-Exchange In Leaves Of Intact And Clipped, Natural And Planted Cherrybark Oak (Quercus Pagoda Raf.) Seedlings, Brian Roy Lockhart, John D. Hodges
Comparative Gas-Exchange In Leaves Of Intact And Clipped, Natural And Planted Cherrybark Oak (Quercus Pagoda Raf.) Seedlings, Brian Roy Lockhart, John D. Hodges
Journal of the Arkansas Academy of Science
Gas-exchange measurements, including CO2 -exchange rate (net photosynthesis), stomatal conductance, and transpiration, were conducted on intact and clipped cherrybark oak (Quercus pagoda Raf.) seedlings growing in the field and in a nursery bed. Seedlings in the field, released from midstory and understory woody competition, showed significant increases in gas-exchange compared to non-released seedlings due to increases in light levels reaching seedlings. Concurrently, little difference occurred in the CO2 -exchange rate between intact and clipped seedlings in the released treatment although clipped seedlings maintained a consistently greater rate of stomatal conductance. In order to reduce the high variability of light levels …
Lichen Communities On White Oaks In East-Central Illinois, Michael R. Thon
Lichen Communities On White Oaks In East-Central Illinois, Michael R. Thon
Masters Theses
This study was conducted as a survey of epiphytic lichen communities occurring on white oak trees at Walnut Point State Park (Douglas Co.) and Fox Ridge State Park (Coles Co.). Using a system of cover classes to estimate lichen cover, quantitative data on the distribution and abundance of epiphytic lichens was obtained. These data were used to calculate summary statistics of each community including total cover, species richness, and Shannon diversity. A total of ten taxa representing six genera were found. The foliose lichen Physcia millegrana had the highest cover in the open canopy habitats while all other taxa had …
An Ecological Study Of The Cumberland Plateau Salamander, Plethodon Kentucki Mittleman, In West Virginia, Jeffrey E. Bailey
An Ecological Study Of The Cumberland Plateau Salamander, Plethodon Kentucki Mittleman, In West Virginia, Jeffrey E. Bailey
Theses, Dissertations and Capstones
A study was conducted to determine various aspects of the ecology of Plethodon kentucki in West Virginia. Results of studies on range and distribution revealed that P. kentucki is limited to southwestern counties in West Virginia. A population of P. kentucki at Beech Fork State Park was extremely seasonal with regard to activity. Seasonal activity was not significantly correlated with air temperature, soil temperature, air relative humidity, or soil pH. Seasonal activity was significantly correlated with soil moisture. Critical Thermal Maxima and dehydration values were not significantly different between f· kentucki and its congener, P. glutinosus, thus each is equally …
Mapping Regional Forest Evapotranspiration And Photosynthesis By Coupling Satellite Data With Ecosystem Simulation, Steven W. Running, Ramakrishna R. Nemani, David L. Peterson, Larry E. Band, Donald F. Potts, Lars E. Pierce, Michael A. Spanner
Mapping Regional Forest Evapotranspiration And Photosynthesis By Coupling Satellite Data With Ecosystem Simulation, Steven W. Running, Ramakrishna R. Nemani, David L. Peterson, Larry E. Band, Donald F. Potts, Lars E. Pierce, Michael A. Spanner
Forest Management Faculty Publications
Mapping Regional Forest Evapotranspiration and Photosynthesis by Coupling Satellite Data With Ecosystem Simulation
Limnological Aspects Of Upland Island: A Wilderness Area In East Texas, J. A. Sidnell, C W. Reed, J. D. Mccullough
Limnological Aspects Of Upland Island: A Wilderness Area In East Texas, J. A. Sidnell, C W. Reed, J. D. Mccullough
Faculty Publications
No abstract provided.
Floristic Composition And Management Of East Texas Pitcher Plant Bogs, E. S. Nixon, J. R. Ward
Floristic Composition And Management Of East Texas Pitcher Plant Bogs, E. S. Nixon, J. R. Ward
Faculty Publications
No abstract provided.
A Management Plan For The Conifer Plantations At St. John's, Collegeville, Minnesota, Paul Schwietz Osb
A Management Plan For The Conifer Plantations At St. John's, Collegeville, Minnesota, Paul Schwietz Osb
Saint John’s Abbey Publications
This paper describes and analyzes the 120 acres of conifer plantations at St. John's Abbey, defines the objectives of management and proposes a 10 year plan for the maintenance and improvement of the plantations. This management plan emphasizes the non-profit corporation's sense of stewardship with multiple use goals. The protection of natural resources is assumed. Aesthetic and recreational values are high priorities, yet educational uses, wildlife protection and timber production are also important considerations. The plan also assumes that forest management at Saint John's will be self-sustaining. Thus the revenue derived from harvesting and thinning will be used to support …
The Effects Of Seed Size And Maternal Origin On The Distribution Of Individual Plant Size In Ludwigia Leptocarpa (Onagraceae), Rebecca W. Dolan
The Effects Of Seed Size And Maternal Origin On The Distribution Of Individual Plant Size In Ludwigia Leptocarpa (Onagraceae), Rebecca W. Dolan
Scholarship and Professional Work - LAS
Seed size is normally distributed for many annual species, while mature plant size is frequently positively skewed. A study was conducted to determine the influence of seed size and the role of genetic differences in determining relative seedling size for Ludwigia leptocarpa. Seed size had a significant effect on percentage germination and time of seed germination but no effect on dry weight or leaf area of seedlings. Seed size and spacing had a significant effect on seedling dry weight for plants grown under competition, while relative day of emergence had no effect. Familial (genetic) differences were found in average seed …
Nepal Studies Association Bulletin, Nos. 16-17, Nepal Studies Association, Donald A. Messerschmidt
Nepal Studies Association Bulletin, Nos. 16-17, Nepal Studies Association, Donald A. Messerschmidt
Nepal Studies Association Newsletter
No abstract provided.
Herbaceous Production In Burned-Cut Burned-Uncut And Control Areas Of A Chamaecyparis Thyoides (L.) Bsp (Cupressaceae) Stand In The Great Dismal Swamp, Caroline Elisabeth Mckinley
Herbaceous Production In Burned-Cut Burned-Uncut And Control Areas Of A Chamaecyparis Thyoides (L.) Bsp (Cupressaceae) Stand In The Great Dismal Swamp, Caroline Elisabeth Mckinley
Biological Sciences Theses & Dissertations
The herbaceous layer of an Atlantic white cedar (Chamaecyparis thyoides) stand in the Great Dismal Swamp was sampled to estimate the productivity of two burned areas and a control area. The herbaceous vegetation was sampled along three transects utilizing the harvest method and productivity values were estimated using peak biomass values for each individual species. The burned-cut area had the highest productivity (3623 kg ha-l yr-1) and was characterized by species of the Asteraceae, Poaceae, and Cyperaceae. The burned-uncut area had a productivity value of 1636 kg ha-1 yr-1 with similar species of the Asteraceae …
Vascular Vegetation And Flora Of Remnant Forest In The Ohio River Floodplain Between The Great Kanawha And Big Sandy Rivers, West Virginia, John Carl Furry
Vascular Vegetation And Flora Of Remnant Forest In The Ohio River Floodplain Between The Great Kanawha And Big Sandy Rivers, West Virginia, John Carl Furry
Theses, Dissertations and Capstones
A total of 246 species of vascular plants representing 75 families were recorded from six physiographically defined forest types in the Ohio River floodplain between the Greet Kanawha end Big Sandy Rivers, West Virginia. Distinct woodlands were those associated with the River flats, River front, bottoms of secondary streams, stream banks, the high floodplain end swamps. Only two species, Acer saccharinum and Platenus occidentalis representing 0.81 percent of the total species encountered, were present in all forest types; 105 species (42.7 percent) were restricted to one forest type. Fifty-five species were new additions to the flora of one or more …
Breeding Birds And Vegetation Of The Central Illinois Floodplain Forest, Daniel Edward Varland
Breeding Birds And Vegetation Of The Central Illinois Floodplain Forest, Daniel Edward Varland
Masters Theses
No abstract provided.
Nepal Studies Association Bulletin, No. 8, Nepal Studies Association, Donald A. Messerschmidt
Nepal Studies Association Bulletin, No. 8, Nepal Studies Association, Donald A. Messerschmidt
Nepal Studies Association Newsletter
No abstract provided.
Studies On The Causes Of Tree Distribution In A Forest Type In The Dismal Swamp National Wildlife Refuge, Thomas A. Janszen
Studies On The Causes Of Tree Distribution In A Forest Type In The Dismal Swamp National Wildlife Refuge, Thomas A. Janszen
Biological Sciences Theses & Dissertations
Vegetational composition and environmental parameters were analyzed in a forest type of the Dismal Swamp. A 0.5 ha forest stand was divided into 200 5 x 5 meter contiguous quadrats and the tree size classes were precisely mapped. Fifty soil samples were analyzed for texture, pH, and major nutrients. A topographic map was constructed with precision to 0.01 ft. Analysis of variance tests showed non-randomness to exist in soil texture and nutrient content while homogeneity tests showed non-randomness in distribution of some woody species. Factor analysis indicated no significant correlations between soil quality, topography, and woody species. Findings indicate that …
Nepal Studies Association Newsletter, Issue 1, Nepal Studies Association
Nepal Studies Association Newsletter, Issue 1, Nepal Studies Association
Nepal Studies Association Newsletter
No abstract provided.
Vegetation Survey Of Floodplain Forests Along The Wabash River, Philip E. Phillippe
Vegetation Survey Of Floodplain Forests Along The Wabash River, Philip E. Phillippe
Masters Theses
No abstract provided.
Woody Vegetation Survey Of Rocky Branch Nature Preserve, Clark County, Illinois, James T. Hughes
Woody Vegetation Survey Of Rocky Branch Nature Preserve, Clark County, Illinois, James T. Hughes
Masters Theses
No abstract provided.
An Ecological Study Of Aspen Forest Communities, Kimball T. Harper
An Ecological Study Of Aspen Forest Communities, Kimball T. Harper
Aspen Bibliography
No abstract provided.
Forestry Bulletin No. 1: Reference Of Values In Studies Affecting The Southern Pines, An Annotated List, R C. Thatcher
Forestry Bulletin No. 1: Reference Of Values In Studies Affecting The Southern Pines, An Annotated List, R C. Thatcher
Forestry Bulletins No. 1-25, 1957-1972
Annotated bibliography of works coving studies of insects affecting the southern pines.
An Ecological Study Of The Upland Conifers Of Itasca State Park, Vernance Beste
An Ecological Study Of The Upland Conifers Of Itasca State Park, Vernance Beste
Journal of the Minnesota Academy of Science
No abstract provided.
Bulletin No. 9: Six Points Of Especial Botanical Interest In Connecticut, Richard H. Goodwin, Frank E. Egler, William A. Niering, Charles E. Olmsted, David M. Smith, Henry W. Hicock, Herbert I. Winer, Edward C. Childs
Bulletin No. 9: Six Points Of Especial Botanical Interest In Connecticut, Richard H. Goodwin, Frank E. Egler, William A. Niering, Charles E. Olmsted, David M. Smith, Henry W. Hicock, Herbert I. Winer, Edward C. Childs
Bulletins
The areas described are the Barn Island Marshes, the Connecticut Arboretum, the North Haven Sand Plains, Catlin Wood, Cathedral Pines and the Bigelow Pond Hemlocks. 32 pp.
Enemies Of Aspen, Clyde M. Christensen, Ralph L. Anderson, A. C. Hodson, Paul O. Rudolf
Enemies Of Aspen, Clyde M. Christensen, Ralph L. Anderson, A. C. Hodson, Paul O. Rudolf
Aspen Bibliography
So long as aspen was considered primarily a weed species, there was little concern over the enemies which might injure or destroy it. Sometimes these enemies were actually considered "blessings in disguise. Now, however, that aspen not only is the most abundant "but also one of the most widely utilized tree species in the Lake States, there is increasing interest in anything that may affect its future supply. For that reason this brief summary of information on the enemies of aspen has been assembled.
Trenched Plots Under Forest Canopies, James W. Toumey, Raymond Kienholz
Trenched Plots Under Forest Canopies, James W. Toumey, Raymond Kienholz
Yale School of the Environment Bulletin Series
The relative importance of light and soil moisture in particular is better known than that of other environmental factors. We are coming to believe that the nature and condition of the reproduction and other surface vegetation beneath living canopies are not due to any single factor such as light or soil moisture, but to a complex of factors.
Further Studies In The Ecotone Between Prairie And Woodland, R. J. Pool, J. E. Weaver, F. C. Jean
Further Studies In The Ecotone Between Prairie And Woodland, R. J. Pool, J. E. Weaver, F. C. Jean
University Studies (University of Nebraska) (1888–1984)
A series of intensive investigations of the ecological features of the tension zone between prairie and woodland in the Mississippi valley was begun by Weaver and Thiel in 1915. These studies were continued for two seasons in Minnesota and were also extended to the prairies of eastern Nebraska in 1916. These investigations represent the first attempt to attack the prairie-forest problem on a comprehensive scale by means of the quantitative methods of modern ecology. Some of the results secured from these studies have been published as the first paper of a series planned to deal with critical investigations in the …