Other Environmental Sciences Commons^™

Effects Of Ultraviolet Radiation On Attached Diatom Growth And Distribution, Heather Lynn Emsley Hatsell

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

No abstract provided.

Impacts Of Air Temperature Variations On The Boro Rice Phenology In Bangladesh: Implications For Irrigation Requirements, Rezaul Mahmood

School of Natural Resources: Faculty Publications

Air temperature significantly affects crop phenology. Numerous experiments have shown that prevailing air temperature determines the length of crop growth stages. Irrigation field requirements depend on the length of the crop growth stages. In the present study, a physically based parametric model, YIELD, has been applied to estimate the impacts of fluctuating air temperature (due to inter-annual climatic variability and global warming) on evapotranspiration water requirements and the length of growth stages of the irrigated boro rice in Bangladesh. The YIELD model is crop specific and crop-growth-stage specific which is a compromise between area-specific regression models and complex crop growth …

Spectral Information Content Of The Boreal Forest, Elizabeth A. Walter-Shea

School of Natural Resources: Faculty Publications

No abstract provided.

Internal Anatomy Of The Snout And Paranasal Sinuses Of Hyaenodon (Mammalia, Creodonta), R. M. Joeckel, H.W. Bond, G.W. Kabalka

School of Natural Resources: Faculty Publications

No abstract provided.

Water-Balance Modeling In A Changing Environment: Reductions In Unconfined Aquifer Levels In The Area Between The Danube And Tisza Rivers In Hungary, Jozsef Szilagyi, Charles Vorosmarty

School of Natural Resources: Faculty Publications

No abstract provided.

Ecological Water Treatment System For Removal Of Phosphorus And Nitrogen From Polluted Water, Ray W. Drenner, Donald J. Day, Stacy J. Basham, J. Durward Smith, Susan I. Jensen

School of Natural Resources: Faculty Publications

We propose that phosphorus and nitrogen can be removed from polluted water using an ecological water treatment system consisting of periphyton and fish. In the proposed system, polluted water flows through a series of vessels, and the nutrients are taken up by periphyton growing on porous screens. Algal-grazing fish feed on the periphyton and either assimilate or egest the nutrients in mucus-bound feces that settle from the water into a sediment trap. Both the fish and their feces can be harvested as nutrient sinks. In this study we examined the effects of an algal-grazing cichlid (Tilapia mossambica) and …

Domestic Well Water Quality In Rural Nebraska: Focus On Nitrate-Nitrogen, Pesticides And Coliform Bacteria, D. C. Gosselin, J. Headrick, R. Tremblay, X. H. Chen, S. E. Summerside

School of Natural Resources: Faculty Publications

No abstract provided.

Radiation And Gas Exchange Of Understory Species At Boreas: Research Annual Performance Report For Period June 15, 1997- June 14, 1998, E. A. Walter-Shea, T. J. Arkebauer

School of Natural Resources: Documents and Reviews

No abstract provided.

Histomorphological Responses Of Red Shiner (Cyprinella Lutrensis) To Atrazine, Terbufos, And Their Mixture, Ibrahim A. Messaad

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

Alterations of normal histomorphology of fish tissues, behavior, and thermal tolerance are recognized by environmental toxicologists and fish biologists as powerful tools indicating diverse biochemical and physiological changes. Toxicity of atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine), terbufos (S-(((1,1-dimethyl-ethyl)thio)methyl)O,O-diethyl phosphorodithioate), and their mixture to red shiner (Cyprinella lutrensis) at 23$\sp\circ$C and 30$\sp\circ$C was investigated in 14-d bioassays after 14-d acclimation. During the bioassays, fish behavior, indications of toxicosis, and external anomalies were observed. After the bioassays, the critical thermal maximum (CTM) was determined. Fish also were preserved for examinations of gill, liver, and kidney tissues using scanning electron microscopy (SEM) and light microscopy (LM). SEM …

The Effects Of Wet Meadow Fragmentation On Grassland Birds, Christopher J. Helzer

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

No abstract provided.

Propagation Of Juniperus For Conservation Plantings In The Great Plains, Scott Allen Lee

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

No abstract provided.

The Biology Of Alewife Alosa Pseudoharengus In Lake Ogallala, Nebraska, Eric A. Laux

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

No abstract provided.

Improving The Validation Of Model-Simulated Crop Yield Response To Climate Change: An Application To The Epic Model* Jour. Ser. No. 11339 Nebraska Ag. Res. Div., William E. Easterling, Xiafen Chen, Cynthia Hays, James R, Brandle, Hehui Zang

School of Natural Resources: Faculty Publications

Crop models have been used extensively to simulate yield response to various scenarios of climate change. Such simulations have been inadequately validated, limiting their utility in policy analysis. In this research, it is argued that the performance of crop models during recent years of extreme weather conditions relative to current normals may give a better indication of the validity of model simulations of crop yields in response to climate change than performance during the full range of climate conditions (as is done now). Twenty years of the climate record (1971-1990) are separated into different growing season temperature and precipitation classes …

Growth And Yield Of Snap Beans (Phaseolus Vulgaris L.) As Affected By Shelterbelts And Planting Dates, Mohd Nazip Suratman

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

No abstract provided.

Thermal Tolerances Of Platte River Fishes: Field And Laboratory Studies, Brett P. Fessell

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

No abstract provided.

Chronic Effects Of Baseflow Levels Of Atrazine On Platte River Algae, Karen J. Nelson

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

No abstract provided.

Influence Of Prey Availability On Walleye (Stizostedion Vitreum), Mark T. Porath

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

No abstract provided.

Surface Exchange Of Water Vapour Between An Open Sphagnum Fen And The Atmosphere, S. B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.

Conifer Shoot Bidirectional Scattering: Methodology And Preliminary Results, E.A. Walter-Shea, M.A. Mesarch

School of Natural Resources: Faculty Publications

No abstract provided.

The Local Effect Of Intermittency On The Inertial Subrange Energy Spectrum Of The Atmospheric Surface Layer, Jozsef Szilagyi, Gabriel G. Katul, Marc B. Parlange, John D. Albertson, Anthony T. Cahill

School of Natural Resources: Faculty Publications

No abstract provided.

Csrees Department Of Forestry, Fisheries & Wildlife Comprehensive Review, University Of Nebraska - Lincoln

School of Natural Resources: Documents and Reviews

No abstract provided.

Scale Issues In Soil Moisture Modelling: Problems And Prospects, Rezaul Mahmood

School of Natural Resources: Faculty Publications

Soil moisture storage is an important component of the hydrological cycle and plays a key role in land-surface-atmosphere interaction. The soil-moisture storage equation in this study considers precipitation as an input and soil moisture as a residual term for runoff and evapotranspiration. A number of models have been developed to estimate soil moisture storage and the components of the soil-moisture storage equation. A detailed discussion of the implication of the scale of application of these models reports that it is not possible to extrapolate processes and their estimates from the small to the large scale. It is also noted that …

Department Of Agricultural Meteorology Csrees Comprehensive Review

School of Natural Resources: Documents and Reviews

No abstract provided.

Application And Evaluation Of A Biotic Index To Sand Hills And Streams Of Nebraska, Gregory T. Michl

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

No abstract provided.

Riparian Habitats Of The Central Platte As A Corridor For Dispersal Of Small Mammals In Nebraska, Thomas D. Silvia

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

No abstract provided.

A Model To Evaluate Windbreak Protection Efficiency, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.

The Economic Impact Of Field Shelterbelts In The Northern Great Plains, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.

Toward An Integrated Regional Research Program On Global Change And The Nation's Major Grasslands: Second Annual Report, Great Plains Regional Center-Nigec

School of Natural Resources: Faculty Publications

I DIRECTOR'S REPORT:

A GPRC Research Framework and Thrusts

B FY94 GPRC Grant Competition

C Synopsis of Current Projects 1 Thrust 1: Impacts of Climate Change 2 Thrust 2: Measuring and Modeling Net Carbon Exchange 3 Other Projects

D Summary and Recommendations of FY94 GPRC PI's Workshop 1 Biogeochemical Cycling Group 2 Climate Scenarios Group 3 Managed and Unmanaged Ecosystem Impacts Group 4 Scaling Group 5 Actions Prompted by the Workshop

E Research Integration with ARM-CART: Eco-ARM

F Future Directions for the GPRC

Appendix I-A: Biogeochemical Cycling Group Workshop Report • Appendix I-B: Climate Change Scenarios Group Workshop Report • …

Tectonic And Paleoclimatic Significance Of A Locally Prominent Upper Pennsylvanian (Virgilian/Stephanian) Weathering Profile, Iowa And Nebraska, U.S.A, R.M. Joeckel

School of Natural Resources: Faculty Publications

No abstract provided.

Paleosols Below The Ames Marine Unit (Upper Pennsylvanian, Virgilian, Conemaugh Group) In The Appalachian Basin, U.S.A.: Variability On An Ancient Depositional Landscape., R.M. Joeckel

School of Natural Resources: Faculty Publications

No abstract provided.