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Articles 29251 - 29280 of 30788
Full-Text Articles in Entire DC Network
Nitrogen And Phosphorus Constraints On Primary Production In The Great Basin Desert, J. J. Jurinak, D. W. James, A. Van Luik
Nitrogen And Phosphorus Constraints On Primary Production In The Great Basin Desert, J. J. Jurinak, D. W. James, A. Van Luik
Memorandum
No abstract provided.
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.
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.
Abundance And Distribution Of Soil Microarthropods In Rock Valley, Nevada, E. B. Edney, P. J. Franco, J. F. Mcbrayer
Abundance And Distribution Of Soil Microarthropods In Rock Valley, Nevada, E. B. Edney, P. J. Franco, J. F. Mcbrayer
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.
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.
Nitrogen Retention In Cool Desert Soils, J. J. Skujins
Nitrogen Retention In Cool Desert Soils, J. J. Skujins
Progress reports
No abstract provided.
Nitrogen Transformations In Rock Valley And Adjacent Areas Of The Mohave Desert, R. B. Hunger, A. Wallace, E. M. Romney
Nitrogen Transformations In Rock Valley And Adjacent Areas Of The Mohave Desert, R. B. Hunger, A. Wallace, E. M. Romney
Progress reports
No abstract provided.
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iv - The Effects Upon The Benthic Associations, Louise Russert Kraemer
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iv - The Effects Upon The Benthic Associations, Louise Russert Kraemer
Arkansas Water Resources Center Technical Reports
The huge and increasing volume of dredged materials being moved in and from the bottoms of waterways of the U.S. is probably well known to the reader. Lee and Plumb (1974) distinguish between the 2 forms of dredging: (1) mining the bottom sediments (as in shell dredging), and (2) developing and maintaining navigable waterways. They indicate some 380,000,000 cubic yards are dredged annually in this country; maintenance dredging accounting for about 80,000,000 cy, and new construction for about 300,000,000 cy.* These figures (based on 5 yr. averages) do not include dredging by private companies. Smith (1975) comments: "With federal dredging …
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iii-The Effects Upon The Zooplankton Associations, Edgar D. Short, Eugene H. Schmitz
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iii-The Effects Upon The Zooplankton Associations, Edgar D. Short, Eugene H. Schmitz
Arkansas Water Resources Center Technical Reports
The primary purpose of the zooplankton phase of the coordinated study was to attempt to evaluate the effects of dredging operations on the abundance, distribution, composition and complexity of the zooplankton communities within the aquatic system of the Arkansas River. The other phases of investigation include fish, macroinvertebrates, phytoplankton and some physico-chemical parameters. The lack of baseline data, needed for measurement of previous ecological conditions from which to detect past and future changes, proved to be a major impediment to any evaluation. Although the study involved only about 240 miles of the river in Arkansas, it should serve as an …
Fisheries Report No 23 - The Management Of Nature Reserves In Western Australia, Andrew A. Burbidge, Trevor Evans
Fisheries Report No 23 - The Management Of Nature Reserves In Western Australia, Andrew A. Burbidge, Trevor Evans
Fisheries Research Reports
The number and area of Nature Reserves in Western Australia has grown rapidly in recent times. At 80 June 1975 there were 491 reserves with an area of 5 103 037 hectares. By 31 December 1975, with the inclusion of reserves for the Conservation of Flora in the definition of a Nature Reserve, there were 900 reserves totalling 5 317 965 ha. With the implementation of the Environmental Protection Authority's recommendations based on the Conservation Through Reserves Committee's Report on Systems 4, 8, 9, 10, 11 and 12 the Nature Reserve System will jump to 985 reserves with an area …
Programming Phase Of Water Response Ecosystem Model: I. Introduction And Support Programs, P. W. Lommen
Programming Phase Of Water Response Ecosystem Model: I. Introduction And Support Programs, P. W. Lommen
Memorandum
No abstract provided.
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System - Volume Ii - Effects Upon The Phytoplankton Associations, Myra Mcnutt, Richard L. Meyer
An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System - Volume Ii - Effects Upon The Phytoplankton Associations, Myra Mcnutt, Richard L. Meyer
Arkansas Water Resources Center Technical Reports
Phytoplankton are a major source of primary production in aquatic ecosystems and constitute one of the most important assemblages of the biotic community. These organisms are the basic level of the trophic pyramid upon which other organisms are dependent. The development, maintenance, and environmental influence of phytoplankton in and on the aquatic ecosystem has been a subject of interest and concern for many years. Most of the studies concerning the nature and distribution of phytoplankton have been confined to lacustrine systems. Hutchinson (1967), citing several lake studies, sutmarized various aspects of the physical and chemical factors associated with phytoplankton. These …
Fisheries Report No 25 - The Western Australian Amateur Fishery For Australian Herring (Arripis Georgianus) - Results Of The 1973 Creel Census, R C.J. Lenanton, N. G. Hall
Fisheries Report No 25 - The Western Australian Amateur Fishery For Australian Herring (Arripis Georgianus) - Results Of The 1973 Creel Census, R C.J. Lenanton, N. G. Hall
Fisheries Research Reports
Historically, the Western Australian production of Australian herring (Arrtpts georgtanus) has fluctuated from year to year in response to changing market demand. Prior to 1968, the annual catch taken by professional fishermen was relatively stable, ranging from 200 000 kg (approx. 500 000 pounds) to 450 000 kg (approx. 1 000 000 pounds). From 1968, commercial production has risen to a peak of 1 187 440 kg (2 617 857 pounds) recorded in 1972/73 (Table I). An increase in demand for herring as bait for the rock lobster fishery is considered to be the major factor involved in this observed …
Effects Of Rodents Of Germination Of Desert Annuals, O.J. Reichman
Effects Of Rodents Of Germination Of Desert Annuals, O.J. Reichman
Memorandum
No abstract provided.
Programming Phase Of Water Response Ecosystem Model: I. Introduction And Support Programs, P. W. Lommen
Programming Phase Of Water Response Ecosystem Model: I. Introduction And Support Programs, P. W. Lommen
Progress reports
No abstract provided.
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
Progress reports
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
Progress reports
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.
Primary Production And Carbon Allocation In Creosotebush: The Effect Of Leaf Age On Net Gas Exchange Capacity, J. P. Syvertsen, G. L. Cunningham
Primary Production And Carbon Allocation In Creosotebush: The Effect Of Leaf Age On Net Gas Exchange Capacity, J. P. Syvertsen, G. L. Cunningham
Memorandum
No abstract provided.
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.
The Influence Of Digging Rodents On Primary Production In Rock Valley, L. F. Soholt, W. K. Irwin
The Influence Of Digging Rodents On Primary Production In Rock Valley, L. F. Soholt, W. K. Irwin
Memorandum
No abstract provided.
Development Concept Plan For Bullfrog Basin: Glen Canyon National Recreation Area, Department Of Interior; National Park Service; United States
Development Concept Plan For Bullfrog Basin: Glen Canyon National Recreation Area, Department Of Interior; National Park Service; United States
Elusive Documents
No abstract provided.
Bear River Basin Environmental Assessment Biotic Resources: Flora- Fauna Appendix Iii, Wyoming Water Planning Program
Bear River Basin Environmental Assessment Biotic Resources: Flora- Fauna Appendix Iii, Wyoming Water Planning Program
Elusive Documents
No abstract provided.
Bear River Basin Environmental Assessment Projections: Summary Report, Wyoming Water Planning Program
Bear River Basin Environmental Assessment Projections: Summary Report, Wyoming Water Planning Program
Elusive Documents
No abstract provided.
Curlew Valley Validation Site Report, J.A. Macmahon
Jornada Validation Site Report, W.G. Whitford
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.
Rock Valley Validation Site Report, F.B. Turner
Tucson Basin Validation Site Report, J.L. Thames