The Role of Fine Sediment in Phosphorus Dynamics and Stream Productivity in Rocky Mountain Headwater Streams PDF Download
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Author: Kirk Fraser Hawthorn Publisher: ISBN: Category : Eutrophication Languages : en Pages : 116
Book Description
Headwater streams in Alberta's Rocky Mountains are important in regulating aquatic ecosystem function and a range of downstream water resources but are vulnerable to stresses imposed by disturbances including those exerted by logging. The objectives of this research were to determine if the legacy of past forest harvesting impacts could be detected in altered sediment-nutrient dynamics and primary productivity in headwaters in the Rocky Mountains of southwestern Alberta. A descriptive, process-based case study was conducted in an undisturbed-disturbed watershed pair where one watershed had undergone extensive harvesting ending in 1990. The disturbed watershed was found to have higher concentrations of suspended solids and fine streambed material, and considerably greater levels of aqueous and particulate phosphorus (P). Primary productivity was much higher in the disturbed system, likely caused by elevated P levels. This study illustrates the potential for logging disturbance to produce long-lived impacts on stream ecology in critical headwater regions.
Author: Kirk Fraser Hawthorn Publisher: ISBN: Category : Eutrophication Languages : en Pages : 116
Book Description
Headwater streams in Alberta's Rocky Mountains are important in regulating aquatic ecosystem function and a range of downstream water resources but are vulnerable to stresses imposed by disturbances including those exerted by logging. The objectives of this research were to determine if the legacy of past forest harvesting impacts could be detected in altered sediment-nutrient dynamics and primary productivity in headwaters in the Rocky Mountains of southwestern Alberta. A descriptive, process-based case study was conducted in an undisturbed-disturbed watershed pair where one watershed had undergone extensive harvesting ending in 1990. The disturbed watershed was found to have higher concentrations of suspended solids and fine streambed material, and considerably greater levels of aqueous and particulate phosphorus (P). Primary productivity was much higher in the disturbed system, likely caused by elevated P levels. This study illustrates the potential for logging disturbance to produce long-lived impacts on stream ecology in critical headwater regions.
Author: Angela Byrne Publisher: ISBN: Category : Eutrophication Languages : en Pages : 62
Book Description
Land use modifications have led to both the intensification of agricultural land and the urbanization that we have been seeing throughout New Zealand since colonization. These land use trends can significantly impact on freshwater stream ecology, with additional nutrients, contaminants and sediments often having degrading effects through loading and deposition. These factors can essentially lead to the streams becoming eutrophic, lacking oxygen and possessing increased aquatic growth. Monitoring these nutrient and sediment controls is vital for understanding stream processes and how these can be affected. This study reflects on nutrient concentrations, like phosphorus and nitrogen, which have shown levels of excess nutrients across many stream environments. Phosphorus will be more greatly covered, identifying nutrient fluxes with the water column and within the sediment, finding the point where phosphorus is neither adsorbed or desorbed, how the phosphorus is bound within sediments, and at what nutrient uptake capacity varying streams have leading to their saturation point of phosphorus. Keywords: nutrients loading, sediment deposition, freshwater streams, land use change, equilibrium point, phosphorus fractionation, uptake capacity
Author: National Research Council Publisher: National Academies Press ISBN: 0309082951 Category : Science Languages : en Pages : 449
Book Description
The Clean Water Act (CWA) requires that wetlands be protected from degradation because of their important ecological functions including maintenance of high water quality and provision of fish and wildlife habitat. However, this protection generally does not encompass riparian areasâ€"the lands bordering rivers and lakesâ€"even though they often provide the same functions as wetlands. Growing recognition of the similarities in wetland and riparian area functioning and the differences in their legal protection led the NRC in 1999 to undertake a study of riparian areas, which has culminated in Riparian Areas: Functioning and Strategies for Management. The report is intended to heighten awareness of riparian areas commensurate with their ecological and societal values. The primary conclusion is that, because riparian areas perform a disproportionate number of biological and physical functions on a unit area basis, restoration of riparian functions along America's waterbodies should be a national goal.
Author: Paul C. M. Boers Publisher: Springer Science & Business Media ISBN: Category : Nature Languages : en Pages : 404
Book Description
This Workshop was organized to assess the status of knowledge on the behaviour of phosphorus in sediments and to define gaps and reassess research strategies, particularly with respect to prevalent methodology and future approach; and to define gaps and reassess research strategies for water management measures in aquatic ecosystems, especially in relation to the release of phosphorus from the sediments and its impact on the functioning of the whole system.
Author: National Research Council Publisher: National Academies Press ISBN: 9780309045346 Category : Technology & Engineering Languages : en Pages : 580
Book Description
Aldo Leopold, father of the "land ethic," once said, "The time has come for science to busy itself with the earth itself. The first step is to reconstruct a sample of what we had to begin with." The concept he expressedâ€"restorationâ€"is defined in this comprehensive new volume that examines the prospects for repairing the damage society has done to the nation's aquatic resources: lakes, rivers and streams, and wetlands. Restoration of Aquatic Ecosystems outlines a national strategy for aquatic restoration, with practical recommendations, and features case studies of aquatic restoration activities around the country. The committee examines: Key concepts and techniques used in restoration. Common factors in successful restoration efforts. Threats to the health of the nation's aquatic ecosystems. Approaches to evaluation before, during, and after a restoration project. The emerging specialties of restoration and landscape ecology.
Author: Kirk Fraser Hawthorn
Author: Kirk Fraser Hawthorn
Author: Angela Byrne
Author: Robert C. Musselman
Author: National Research Council
Author: Judith L. Meyer
Author: William F. James
Author: Paul C. M. Boers
Author: Rebecca A. Reed
Author: National Research Council
Author: Thomas Charles Young