Open Access. Powered by Scholars. Published by Universities.®
- Keyword
- Publication
- Publication Type
Articles 1 - 30 of 59
Full-Text Articles in Life Sciences
Leaf Epidermal Transmittance Of Ultraviolet Radiation And Its Implication For Plant Sensitivity To Ultraviolet-Radiation Injury, Ronald Robberecht
Leaf Epidermal Transmittance Of Ultraviolet Radiation And Its Implication For Plant Sensitivity To Ultraviolet-Radiation Injury, Ronald Robberecht
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Leaf epidermal transmittance of ultraviolet radiation (280-400 nm) was examined in several plant species to determine the capability of the epidermis to attenuate solar ultraviolet radiation. Epidermal samples were mechanically isolated and examined with a spectroradiometer/integrating sphere for transmittance. A survey of 25 species exposed to natural insolation was conducted. Although the species differed in life form, habitat type, and epidermal characteristics, epidermal transmittance was generally less than 10%. Ultraviolet radiation was attenuated 95 to 99% in more than half of the species. In 16 species, flavonoid and related pigments in the epidermis accounted for 20 to 57% of the …
Feeding Behavior Of Pen Reared Mule Deer Under Winter Range Conditions, Michael A. Smith
Feeding Behavior Of Pen Reared Mule Deer Under Winter Range Conditions, Michael A. Smith
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This study examined the feeding responses of mule deer to a system of spring livestock grazing. The specific purposes were 1) to determine botanical composition of diets selected by mule deer on a winter range subjected to previous spring grazing by sheep compared to one with no sheep grazing and 2) to develop a basis for predicting selection of individual plants by deer, based on physical characteristics of the plants and the species and physical proximity of associated plants.
The study was conducted within the framework of a completely randomized experimental design with two treatments. Variables controlled for each unit …
Forage Selection And Nutrition Of Sheep And Goats Grazing In The Tunisian Pre-Sahara, Rudolfo Ricardo Griego
Forage Selection And Nutrition Of Sheep And Goats Grazing In The Tunisian Pre-Sahara, Rudolfo Ricardo Griego
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Nomadic pastoralism has been the traditional method of utilizing grazing resources in arid and semi-arid regions of Africa. However, increased sedentarization accompanied by growing human and animal populations during the past two decades is thought to be accelerating the desertification process, or desert expansion. The specific interactions of the grazing animal with this process has been speculated upon but not studied in detail. A comparative study was initiated during the spring grazing season of 1974 to determine sheep and goat nutritional and production responses, as well as patterns of vegetative selection and utilization under the pastoral system currently employed in …
Programming Phase Of Water Response Ecosystem Model: Iii. Animal Submodel, J. E. Heasley
Programming Phase Of Water Response Ecosystem Model: Iii. Animal Submodel, J. E. Heasley
Memorandum
No abstract provided.
Programming Phase Of Water Response Ecosystem Model: V. Annual Plant Submodel, B. J. Gilbert
Programming Phase Of Water Response Ecosystem Model: V. Annual Plant Submodel, B. J. Gilbert
Memorandum
No abstract provided.
Programming Phase Of Water Response Ecosystem Model: Perennial Plant, Nitrogen And Decomposition Submodels, P. W. Lommen, D. C. Wilkin
Programming Phase Of Water Response Ecosystem Model: Perennial Plant, Nitrogen And Decomposition Submodels, P. W. Lommen, D. C. Wilkin
Memorandum
No abstract provided.
Plant Productivity And Nutrient Interrelationships Of Perennials In The Mohave Desert, A. T. Vollmer, A. Wallace, J. W. Cha, T. Hartsock
Plant Productivity And Nutrient Interrelationships Of Perennials In The Mohave Desert, A. T. Vollmer, A. Wallace, J. W. Cha, T. Hartsock
Memorandum
No abstract provided.
A Simulation Model Of Primary Production And Carbon Allocation In The Creosotebush, Larrrea Tridentata (Dc) Cav., G. L. Cunningham, J. F. Reynolds
A Simulation Model Of Primary Production And Carbon Allocation In The Creosotebush, Larrrea Tridentata (Dc) Cav., G. L. Cunningham, J. F. Reynolds
Memorandum
No abstract provided.
Tucson Basin Validation Site Report, J. L. Thames
Gas Exchange, Translocation, Root Growth And Soil Respiration Of Great Basin Plants, M. M. Caldwell, L. B. Camp, R. S. Holthausen, H. Neuber
Gas Exchange, Translocation, Root Growth And Soil Respiration Of Great Basin Plants, M. M. Caldwell, L. B. Camp, R. S. Holthausen, H. Neuber
Memorandum
No abstract provided.
Jornada Validation Site Report, W. G. Whitford
Gas Exchange And Productivity Of Sonoran Desert Shrubs, S. R. Szarek, R. M. Woodhouse
Gas Exchange And Productivity Of Sonoran Desert Shrubs, S. R. Szarek, R. M. Woodhouse
Memorandum
No abstract provided.
Plant Demographic Studies Of Desert Annual Communities In Northern Utah Dominated By Non-Native Weedy Species, D. R. Duba, B. E. Norton
Plant Demographic Studies Of Desert Annual Communities In Northern Utah Dominated By Non-Native Weedy Species, D. R. Duba, B. E. Norton
Memorandum
No abstract provided.
Estimation Of Functional Root Biomass And Root And Shoot Response Of Atriplex Confertifolia To Summer Rain, K. C. Hodgkinson, P. S. Johnson, B. E. Norton
Estimation Of Functional Root Biomass And Root And Shoot Response Of Atriplex Confertifolia To Summer Rain, K. C. Hodgkinson, P. S. Johnson, B. E. Norton
Memorandum
No abstract provided.
Plant Food Preferences Of Two Sympatric Rodents And Their Potential Impact On A Great Basin Shrub Community, E. L. Becker Ii, D. F. Balph
Plant Food Preferences Of Two Sympatric Rodents And Their Potential Impact On A Great Basin Shrub Community, E. L. Becker Ii, D. F. Balph
Memorandum
No abstract provided.
Effects Of Rodents On Germination Of Desert Annuals, O. J. Reichman
Effects Of Rodents On Germination Of Desert Annuals, O. J. Reichman
Memorandum
No abstract provided.
Nitrogen Dynamics In Stands Dominated By Some Major Cool Desert Shrubs. V. Studies On Denitrification And Nitrogen Fixation: Comparison Of Biological Process In Western Deserts, J. J. Skujins
Memorandum
No abstract provided.
Nitrogen Retention In Cool Desert Soils, J. J. Skujins
Nitrogen Retention In Cool Desert Soils, J. J. Skujins
Memorandum
No abstract provided.
Decomposition And Mineralization In An Artemisia Tridentata Community In Northern Nevada, P. L. Comanor
Decomposition And Mineralization In An Artemisia Tridentata Community In Northern Nevada, P. L. Comanor
Memorandum
No abstract provided.
Measurement Of Evapotranspiration With A Monolith Lysimeter, D. W. Young, D. D. Evans, T. W. Sammis, C. Constant
Measurement Of Evapotranspiration With A Monolith Lysimeter, D. W. Young, D. D. Evans, T. W. Sammis, C. Constant
Memorandum
No abstract provided.
Seasonal Use Of Soil Moisture By Larrea Tridentata And Ambrosia Deltoidea, D. R. Cable
Seasonal Use Of Soil Moisture By Larrea Tridentata And Ambrosia Deltoidea, D. R. Cable
Memorandum
No abstract provided.
Tucson Basin Validation Site Report, J.L. Thames
Responses And Interactions In Desert Plants As Influenced By Irrigation And Nitrogen Applications, R.B. Hunter, E. M. Romney, A. Wallace, H.O. Hill, T.A. Ackerman, J.E. Kinnear
Responses And Interactions In Desert Plants As Influenced By Irrigation And Nitrogen Applications, R.B. Hunter, E. M. Romney, A. Wallace, H.O. Hill, T.A. Ackerman, J.E. Kinnear
Memorandum
No abstract provided.
Biology Of Nematodes In Desert Ecosystems, D.W. Freckman, R. Mankau
Biology Of Nematodes In Desert Ecosystems, D.W. Freckman, R. Mankau
Memorandum
No abstract provided.
Abundance And Distribution Of Soil Micro-Arthropods In Rock Valley, Nevada, E.B. Edney, P.J. Franco, J.F. Mcbrayer
Abundance And Distribution Of Soil Micro-Arthropods In Rock Valley, Nevada, E.B. Edney, P.J. Franco, J.F. Mcbrayer
Memorandum
No abstract provided.
Plant Productivity And Nutrient Inter-Relationships Of Perennials In The Mohave Desert, A.T. Vollmer, A. Wallace, J.W. Cha, T. Hartsock
Plant Productivity And Nutrient Inter-Relationships Of Perennials In The Mohave Desert, A.T. Vollmer, A. Wallace, J.W. Cha, T. Hartsock
Memorandum
No abstract provided.
Demographic Studies Of Sagebrush Insects As Functions Of Various Environmental Factors, T.H. Hsiao, A.K. Temte
Demographic Studies Of Sagebrush Insects As Functions Of Various Environmental Factors, T.H. Hsiao, A.K. Temte
Memorandum
No abstract provided.
Rock Valley Validation Site Report, F. B. Turner
Growth Of Perennials In Response To Varying Moisture And Defoliation Regimes, J. A. Macmahon, B. E. Norton, B. M. Capen
Growth Of Perennials In Response To Varying Moisture And Defoliation Regimes, J. A. Macmahon, B. E. Norton, B. M. Capen
Memorandum
No abstract provided.
Phenology And Function Of Sonoran Desert Annuals In Relation To Environmental Changes, D. T. Patten, W. L. Mckenzie
Phenology And Function Of Sonoran Desert Annuals In Relation To Environmental Changes, D. T. Patten, W. L. Mckenzie
Memorandum
No abstract provided.