Other Environmental Sciences Commons^™

Changes In Photosynthesis Rate In Pinus Sylvestris L. And Pinus Banksiana Lamb Seedlings Subjected To Drought Stress, George A. Riggs Jr.

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Contrasts Among Bidirectional Reflectance Of Leaves, Canopies, And Soils, Elizabeth A. Walter-Shea

School of Natural Resources: Faculty Publications

No abstract provided.

Microclimate-Plant Architectural Interactions: Influence Of Leaf Width On The Mass And Energy Exchange Of A Soybean Canopy, S. B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.

Manual: Measurement Of Evapotranspiration By The Bowen Ratio Energy Balance Method, Joon Kim, Shashi Verma

School of Natural Resources: Faculty Publications

The Bowen ratio energy balance method has been widely used by many researchers to estimate the fluxes of water vapor and sensible heat between crops and atmosphere. The energy balance for the crop canopy can be expressed as Rn + G + H + LE + PS + M = 0 (1) where Rn is net radiation, G is soil surface heat flux, H is sensible heat flux and LE is latent heat flux.

Soils And The Location Of Cacao Orchards At A Maya Site In Western Belize, Daniel R. Muhs, Robert R. Kautz, J. Jefferson Mackinnon

United States Geological Survey: Staff Publications

Cacao was one of the most important crops of the lowland Maya. Ethnohistoric sources document that the Postclassic-Colonial Period Maya settlement of Tipu in western Belize was an important cacao-growing center, yet evidence of where the cacao was grown is not apparent. We analysed the suitability of floodplain, terrace, and bedrock soils for cacao cultivation. Our results indicate that the soils most likely to have been used for cacao growth were those on the modem floodplain of the Macal River, based on their suitable physical and chemical properties. In addition, buried stone walls of Late Classic or Postclassic age that …

An Evaluation Of Uranium-Series Dating Of Fossil Echinoids From Southern California Pleistocene Marine Terraces, Daniel R. Muhs, Los Angeles County Museum Of Natural History, Los Angeles, Ca

United States Geological Survey: Staff Publications

Fossil sea urchins (Strongylocentrotus) from Pleistocene marine terraces on the southern California Channel Islands have been dated by the uranium-series method in order to test the suitability of echinoids for dating marine terraces. Results indicate that urchin plates and spines do not behave as closed systems with respect to both uranium and thorium. Calculated ages based on these data do not agree with uranium-series ages (120,000 and 127,000 yrs) obtained previously from corals from the same localities. Thus, fossil sea urchins (Strongylocentrotus) are not considered suitable for uranium-series dating of Pleistocene marine terrace deposits.

Small Mammal Populations And Rodent Damage In Nebraska No-Tillage Crop Fields, Kent E. Holm

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

House Mouse Populations And Their Damage To Common Building Insulations, Daryl D. Fisher

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

A Study Of The Crayfish Orconectes Immunis In An Intermittent Nebraska Stream, John J. Shadle

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Effects Of The Plains Pocket Gopher (Geomys Bursarius) On Hay Meadows And Irrigated Alfalfa In The Nebraska Sandhills, Patrick J. Hegarty

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Vital Characteristics Of The Black-Tailed Jack Rabbit In East-Central Nebraska, Rockford G. Plettner

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Selection Criteria For Drought Resistance, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.

Partitioning Solar Radiation Into Direct And Diffuse, Visible And Near-Infrared Components, A. Weiss

School of Natural Resources: Faculty Publications

No abstract provided.

Kolmogorov Constants For Co2, Wind Velocity, Air Temperature, And Humidity Fluctuations Over A Crop Surface, S. B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.

Geohydrology Of The High Plains Aquifer In Parts Of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, And Wyoming, Edwin D. Gutentag, Frederick J. Heimes, United States Geological Survey, Richard R. Luckey, John B. Weeks

United States Geological Survey: Staff Publications

The High Plains aquifer, which underlies about 174,000 square miles in parts of eight states, is the principal source of water in one of the Nation's major agricultural areas. About 170,000 wells pump water from the aquifer to irrigate about 13 million acres in the High Plains. In 1978, the United States Geological Survey began a regional study of the High Plains aquifer to provide geohydrologic data and computer models of the aquifer needed to evaluate the effects of ground-water development. This report describes the geohydrology of the High Plains aquifer. The High Plains aquifer consists mainly of hydraulically connected …

Methiocarb And Thiram As Thirteen-Lined Ground Squirrel Repellents In Newly Planted Corn, Ann E. Koehler

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Climate Model For Winter Wheat Yield Simulation, Kenneth G. Hubbard, R.J. Hanks

School of Natural Resources: Faculty Publications

Winter wheat yields were simlulated by a model requiring climatic data as input for estimating crop evapotranspiration and phenological development. An assumed relationship between the winter wheat yields and the amount and timing of crop water use was optimized to simulate yields for two case studies: a single season, irrigated wheat study, and a multi-year, dryland wheat study. The model explained more than 90% of the variance of wheat yields in the irrigated study where total irrigation amounts varied between 0 and 55 cm. About 40% of the variance was explained for annual yields from a 21-year, dryland winter wheat …

Spatial And Temporal Variations In Long-Term Normal Percent Possible Solar Radiation Levels In The United States, Robert C. Balling, Randall S. Cerveny

School of Natural Resources: Faculty Publications

The purpose of this study was to analyze the time and space variations in long-term monthly-averaged daily percent possible solar radiation levels in the United States. Both principal components analysis and harmonic analysis were used to identify the influences of various synoptic-scale climatological phenomena on solar radiation receipt. Generally, an annual cycle was found with maximum percent possible radiation levels occurring in July. In many regions the temporal variance structure deviated from this general annual cycle. The results, which are useful in both theoretical and practical studies, lead to a better understanding of the climatology of solar radiation in the …

Bird Dispersal Recordings: An Overview, Robert H. Schmidt, Ron J. Johnson

School of Natural Resources: Faculty Publications

Copyright® 1983 by ASTM International. Used by permission.

Turbulent Exchange Of Carbon Dioxide, Water Vapor, Heat And Momentum Over Crop Surfaces, Dean E. Anderson

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

A Hydrochemical Reconnaissance Study Of The Walker River Basin, California And Nevada, Larry Benson, R. J. Spencer

United States Geological Survey: Staff Publications

During 1975 and 1976, a large number of water and sediment samples were collected from the Walker River Basin. Additional surface water samples were collected during 1980 and 1981. Data are given herein for chemical analyses of snowmelt, tributary, river, spring, well, lake, reservoir, lake sediment pore fluid, tufa, lake and river sediment samples. These data provide the basis for consideration of processes which govern the chemical evolution of large closed basin hydrologic systems in the Basin and Range Province of the Southwestern United States.

The Walker River Basin, a part of the Basin and Range Province, is located i~ …

Institutional Arrangements For Flood Plain Management In Ontario An Analysis Of The West Ferris Flood Plain Management Study, Dan Shrubsole

Theses and Dissertations (Comprehensive)

The intent of this study is to investigate how river basin study delays could be avoided or shortened. Mitchell and Gardner (1983) identified the need for this type of research in order to make watershed planning credible. This study specifically focuses on how the institutional arrangement for flood plain management may be improved to provide more efficient and effective management, present institutional arrangement for flood plain management in Ontario. The research was divided into two phases. The first phase was a literature review pertaining to comprehensive river basin management, institutional arrangements for water management, and general planning. This review led …

Variation Of Whole Body Components As An Indicator Of Habitat Quality In Geomys Bursarius And Peromyscus Maniculatus, Joseph W. Nietfeldt

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Mass And Energy Exchanges Of Soybeans: Microclimate–Plant Architectural Interactions, Dennis D. Baldocchi

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Influence Of Windbreak-Shelter On Soybean Growth Canopy Structure, And Light Relations, S.N. Ogbuehi, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.

Agricultural Meteorology In China, Norman J. Rosenberg

School of Natural Resources: Faculty Publications

During nearly five weeks in China (May-June 1981), the author visited scientific institutions and experiment stations engaged in agricultural meteorology and climatology research and teaching. The facilities, studies, and research programs at each institution are described and the scientific work in these fields is evaluated. Agricultural meteorology and climatology are faced with some unique problems and opportunities in China and progress in these fields may be of critical importance to that nation in coming years. The author includes culinary notes and comments on protocol in China.

A Digital Archive Of Northern Hemisphere Snow Cover, November 1966 Through December 1980, Kenneth F. Dewey, Richard R. Heim Jr.

School of Natural Resources: Faculty Publications

The purpose of this article is to acquaint the research community with a new data base—a digitized archive of Northern Hemisphere snow cover. Historically, those researchers who needed snow cover data for climatic and atmospheric boundary layer studies have had to rely on the irregularly spaced (and in some regions, sparse) grid of point observations. Northern Hemisphere Weekly Snow and Ice Cover Charts, which are created from analyzed satellite imagery at the National Earth Satellite Service (NESS), have been available on an operational basis since late 1966. Each of these weekly charts for the period November 1966 through December 1980 …

Influence Of Windbreak-Shelter On Soybean Production Under Rainfed Conditions, S.N. Ogbuehi, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.

Influence Of Windbreak-Shelter On Soybean Production Under Rainfed Conditions, S.N. Ogbuehi, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.

Forestry For Wildlife Habitat Improvement. Nebraska Cooperative Extension Service Ec 81-1747, Ec 80-1747, Frank A. Hershey, Howard L. Wiegers

School of Natural Resources: Faculty Publications

Wildlife cannot exist without food and protective cover. Natural and planted woodlands contribute significantly to these essentials. This circular describes habitat needs of wildlife, recommends forestry practices for habitat improvement, and gives examples of practices to improve habitat for pheasant, quail, and deer.

Variety, rather than uniformity of vegetation, benefits most wildlife species. Management which results in a diverse plant community with many stages of growth can increase the numbers and species of wildlife. Techniques which create improved conditions for woodland wildlife are fundamentally the same as those designed to grow good timber.