Download or read book Bioavailability of Sediment Phosphorus in Geochemically Contrasting Aquatic Systems written by Adam R. Hoffman and published by . This book was released on 2008 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Phosphorus Biogeochemistry of Sub Tropical Ecosystems written by K. Ramesh Reddy and published by CRC Press. This book was released on 1999-04-29 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphorus is one of the major nutrients limiting the productivity of terrestrial, wetland and aquatic ecosystems. Over the last decade several research projects were conducted on Florida's ecosystems from state and federal agencies and private industry to address water quality issues, and to develop management practices to control nutrient loads. Phosphorus Biogeochemistry in Sub-Tropical Ecosystems is the first thorough study of the role of phosphorus in ecological health and water quality ever published. Because of its vast and extensively studied ecosystems, Florida has often served as a national laboratory on current and future trends in ecosystem management. The reader will find studies at all levels of biological organization, from the cellular to entire ecological communities. The book is a definitive study of the role and behavior of phosphorus deposition in the upland/wetland/aquatic environment. The papers presented in this book are organized in specific groups: ecological analysis and global issues, biogeochemical transformations, biogeochemical responses, transport processes, phosphorus management, and synthesis. Although Florida's ecosystems are used as a case study, the results presented have global applications.

Download or read book Proceedings of the Third International Workshop on Phosphorus in Sediments written by P.C.M. Boers and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Bioavailability of Sediment Phosphorus Inputs to the Lower Great Lakes written by Scott C. Martin and published by . This book was released on 1983 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2013 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geochemical Controls Over Phosphorus Bioavailability As A Function Of Redox Sensitive Iron Oxides written by Barczok R. Maximilian and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the geochemical controls on how phosphorus (P), a limiting or co-limiting nutrient for plants and microorganisms in many ecosystems, adsorbs to iron (oxyhydr)oxides minerals (henceforth called Fe oxides) is vital to predict the bioavailability of P in a system. Orthophosphate (henceforth called phosphate), the major ion of P utilized by biota, binds strongly to Fe oxides and is removed from solution, decreasing its bioavailability. The ability of Fe oxides to adsorb phosphate and act as a geochemical control on phosphate bioavailability depends on the crystallinity and mineralogy of the Fe oxides. Changes in hydrology and resulting shifts in redox conditions, represented by field measurements of redox potential (Eh), can directly impact phosphate bioavailability by either dissolving Fe oxides and releasing phosphate or precipitating low crystallinity Fe oxides adsorbing phosphate. Additional importance of the interaction of Fe oxides and P is their impact on the stability of soil organic carbon (OC) in Arctic permafrost soils. Permafrost ecosystems store a significant amount (~60%) of the worlds soil OC that are vulnerable to emissions to the atmosphere with increasing permafrost thaw. As such I hypothesize that shifts in soil EH caused by climatic variations such as progressing permafrost thaw and will shift Fe speciation in soil towards low crystallinity Fe oxides, such as ferrihydrite, and increase the capacity of phosphate adsorption and over a longer time period decrease bioavailability of phosphate to microorganism stabilizing soil OC. In this dissertation, I investigate 1) how EH responds to hydrological change, 2) the impact of EH and Fe oxide mineralogy on Fe oxide dissolution and transformation, as well as 3) the resulting impact of changing Fe oxide mineralogy on phosphorus bioavailability to the system, and 4) the impact of thawing permafrost on soil EH and Fe crystallinity and speciation, and the resulting impact on phosphorus sorption to Fe oxides . Methods employed to address the above mentioned research goals included 1) continuous, high resolution measurements of EH with platinum electrodes, 2) sequential extractions to quantify extractable Fe and P in soils and in field-incubated minerals, and 3) x-ray absorption fine structure (XAFS) spectroscopy to evaluate changes in Fe speciation. In Chapter 2, I present research on how soil EH responds to hydrological change in and around a vernal pond . I show how Eh can vary within a small pond temporally and spatially, and how Fe reducing conditions can persist without surface water ponding. In Chapter 3 I describe how Fe oxide speciation evolves over time towards lower crystallinity in contrasting redox conditions at the same vernal pond as in Chapter 2. I also show how Fe oxides can retain phosphate and how freshly precipitated Fe oxides adsorb phosphate potentially reducing bioavailability of P. In Chapter 4 I show how Eh differs along a permafrost gradient in Sweden. I also show how Fe speciation shifts towards the poorly crystalline Fe oxide ferrihydrite as permafrost thaw progresses. Additionally, I show the strong association of P to Fe oxides along the permafrost gradient.

Download or read book Phosphorus in Freshwater Ecosystems written by Gunnar Persson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a symposium held in Uppsala, Sweden, September 25-28, 1985

Download or read book Phosphorus in Fresh Water and the Marine Environment written by S. H. Jenkins and published by Elsevier. This book was released on 2013-10-22 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphorus in Fresh Water and the Marine Environment investigates sources of phosphorus in fresh water and the marine environment and the problems it causes. The importance of phosphate precipitation as an inbuilt safety device against overproduction of algae in the oceans is discussed, along with the deposition and absorption of phosphates in sediments. The source of the phosphorus in lakes and rivers is considered in relation to population density and distribution. This book is comprised of 26 chapters and begins with a discussion on natural phosphate sources in relation to phosphate budgets, paying particular attention to eutrophication and soil erosion. The significance of man-made sources of phosphorus, such as fertilizers and farming, detergents and sewage, is then examined. Subsequent chapters focus on the role of phosphorus in the growth of plants and animals in rivers, lakes, and the sea; the hydrogeochemical cycling of phosphorus; phosphorus analysis in sea water; and safety evaluation of substitutes for phosphates in detergents. The microbiology of an activated sludge wastewater treatment plant chemically treated for phosphorus removal is also explored. This monograph will be of interest to policymakers concerned with water pollution control.

Download or read book Treatise on Estuarine and Coastal Science written by and published by Academic Press. This book was released on 2012-03-06 with total page 4604 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of estuaries and coasts has seen enormous growth in recent years, since changes in these areas have a large effect on the food chain, as well as on the physics and chemistry of the ocean. As the coasts and river banks around the world become more densely populated, the pressure on these ecosystems intensifies, putting a new focus on environmental, socio-economic and policy issues. Written by a team of international expert scientists, under the guidance of Chief Editors Eric Wolanski and Donald McClusky, the Treatise on Estuarine and Coastal Science, Ten Volume Set examines topics in depth, and aims to provide a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Most up-to-date reference for system-based coastal and estuarine science and management, from the inland watershed to the ocean shelf Chief editors have assembled a world-class team of volume editors and contributing authors Approach focuses on the physical, biological, chemistry, ecosystem, human, ecological and economics processes, to show how to best use multidisciplinary science to ensure earth's sustainability Provides a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Features up-to-date chapters covering a full range of topics

Download or read book The Bioavailability of Sediment and Dissolved Organic Phosphorus Inputs to Lake Tahoe written by Joseph W. Ferguson and published by . This book was released on 2005 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bioavailability of Contaminants in Soils and Sediments written by National Research Council and published by National Academies Press. This book was released on 2003-05-03 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioavailability refers to the extent to which humans and ecological receptors are exposed to contaminants in soil or sediment. The concept of bioavailability has recently piqued the interest of the hazardous waste industry as an important consideration in deciding how much waste to clean up. The rationale is that if contaminants in soil and sediment are not bioavailable, then more contaminant mass can be left in place without creating additional risk. A new NRC report notes that the potential for the consideration of bioavailability to influence decision-making is greatest where certain chemical, environmental, and regulatory factors align. The current use of bioavailability in risk assessment and hazardous waste cleanup regulations is demystified, and acceptable tools and models for bioavailability assessment are discussed and ranked according to seven criteria. Finally, the intimate link between bioavailability and bioremediation is explored. The report concludes with suggestions for moving bioavailability forward in the regulatory arena for both soil and sediment cleanup.

Download or read book Controls on Bioavailability of Phosphorus in the Coastal Ocean A Coupled Geochemical and Enzymatic Approach written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary goal of this study was to determine whether phosphate limitation of phytoplankton occurs in the coastal ocean. Three cruises on the Eel River Shelf, northern California were completed in spring, summer 1996 and winter 1997 from which hydrographic and nutrient inventory data from 3 to 5 shore-perpendicular transects were collected. These geochemical data were coupled with enzymatic assay data for Alkaline Phosphatase (APase), an inducible enzyme indicative of phosphate limitation, to evaluate the importance and spatial distribution of phosphate limitation. Nutrient-nutrient plots (e.g.; DIN versus DIP) indicate a shift from N-limitation in spring to P-limitation in summer. Those stations which exhibit lowest DIP in summer also have high APase activities, suggesting that the algal populations at these sites were phosphate limited. These findings indicate that the prevailing dogma of ubiquitous nitrogen (N) limitation of biological productivity in the coastal ocean is overly simplistic. A high degree of spatial variability in surface-water chl-a, dissolved nutrient concentrations, and APase was observed in spring and summer, illustrating the patchy nature of coastal phytoplankton blooms and the importance of high-density sampling grids to effectively characterize the overall biomass and nutrient limitation conditions of such system.

Download or read book Biological availability of sediment phosphorus inputs to the lower Great Lakes written by Scott C. Martin and published by . This book was released on 1985 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of Phosphorus Sources and Bioavailability at Different Hydrodynamic Gradients in Coastal Environments written by Qiang Li and published by . This book was released on 2020 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphorus (P) over-loading is a leading cause of surface water eutrophication and bottom water hypoxia. Response to P loading on water quality varies with watershed size and other physico-chemical and biological parameters. As the watershed size increases, nutrient loading augments and often results in complex and non-linear response to loading and corresponding biogeochemical interactions. The limited understanding between different P pools and their bioavailability from sources to sinks has limited the development of appropriate nutrient management strategies aimed to improve water quality. To address this knowledge gap, this dissertation research investigated P sources and transformation pathways at small (~62 km2) Love Creek watershed in Rehoboth Bay and part of larger Susquehanna River estuary (~777 km2) in Chesapeake Bay. In both watersheds, multiple stable isotopes and geochemical proxies were applied to analyze colloidal, dissolved, and soil/sediment P pools and associated elements along the continuum from the sources and sinks.

Download or read book Proceedings of the First International Workshop on Sediment Phosphorus written by Roland Psenner and published by E. Schweizerbartsche Verlagsbuchhandlung. This book was released on 1988 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evidence for sulphate controlled phosphorus release from sediments of aquatic systems written by N.F. CARACO and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Abiotic Controls of Fine Sediment on the Form and Mobility of Phosphorus in a Gravel bed River During Low Flow written by Caitlin Watt and published by . This book was released on 2018 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Landscape scale disturbance in forested source water regions can accelerate the transfer of fine sediment and associated phosphorus (P) to receiving streams and degrade water quality in downstream environments for human and ecosystem use. The abiotic controls of deposited riverbed and suspended fine sediment on the form and mobility of P were examined in an oligotrophic gravel-bed river undergoing cumulative downstream sediment pressures from disturbance (e.g., harvesting, wildfire and sewage effluent) in Alberta, Canada. The spatial distribution of particulate P forms (NAIP, AP, OP) and major element composition were assessed across six study sites in the Crowsnest River that receive tributary inputs from watersheds that have experienced a range of landscape disturbance types. Pore-water soluble reactive P (SRP) concentration profiles within the gravel-bed were measured with pore-water peepers. Diffusive fluxes from the sediment to the water column were related to landscape disturbances, substrate properties, dissolved oxygen concentrations, and fine sediment sorption characteristics. A series of batch experiments were conducted to determine the Equilibrium Phosphate Concentration (EPC0) and evaluate the potential of fine sediment to influence P concentrations in the overlying water column. Results of the study demonstrated varying sensitivities to landscape disturbances due to the heterogeneous nature of gravel-bed substrate and morphology. Macro- to micro-scale processes influenced the form and mobility of P, however fine sediments in the riverbed irrespective of landscape disturbance demonstrated the potential of the riverbed to release SRP to the water column. Sewage inputs had the greatest impact on SRP fluxes from the riverbed and bioavailability of P in suspended sediments. The most bioavailable form of particulate P (NAIP) was associated with metal oxide and organic carbon coatings on sediment. Lower dissolved oxygen concentrations are likely responsible for driving the release of P from redox sensitive metals. Bioavailable particulate P and the release of SRP can influence in-stream water quality and ecological communities, and over longer time scales can propagate effects downstream to reservoirs and impact drinking water supplies. This thesis provides new knowledge regarding the impacts of both landscape disturbance and site-specific abiotic processes that influence the form and mobility of P in a gravel-bed river during the biologically sensitive period of summer low flow.