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Author: Chesapeake Bay Program (U.S.). Nutrient Subcommittee. Agricultural Nutrient Reduction Workgroup
Publisher:
ISBN:
Category : Nutrient pollution of water
Languages : en
Pages : 11
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Book Description
Author: Chesapeake Bay Program (U.S.). Nutrient Subcommittee. Agricultural Nutrient Reduction Workgroup
Publisher:
ISBN:
Category : Nutrient pollution of water
Languages : en
Pages : 11
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Book Description
Author: Andrew N. Sharpley
Publisher: CRC Press
ISBN: 9781566704946
Category : Technology & Engineering
Languages : en
Pages : 256
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Book Description
Using the Chesapeake Bay as a case study, Agriculture and Phosphorus Management discusses the impact and management of phosphorus in watersheds. Although urban and other sources contribute phosphorus to the Bay, the papers presented focus on how its role in agriculture impacts water quality. They review the new guidelines and legislation slated for implementation by 2002 directed towards sustainable nutrient management and strategies for implementing them. Phosphorus, an essential element for plant and animal growth, has long been recognized as necessary to eliminate deficiencies and to maintain profitable crop and livestock production. It can increase the biological productivity of surface waters by accelerating eutrophication. Human activities accelerate the rate of eutrophication - principally by increasing the rate at which phosphorus enters the aquatic system. Written by experts from a range of disciplines Agriculture and Phosphorus Management provides a deeper understanding of the diverse, dynamic, and complex factors controlling the impact of agricultural phosphorus management on production and water quality. Each contributor addresses the questions: what do we know, what do we still need to know, where are the major gaps in our knowledge, and how does the information relate to phosphorus management strategies in the Bay Watershed, and other watersheds? As a result this series of papers provides a unique collection of information of regional, national, and international significance and gives prioritized phosphorus management options for not only the Chesapeake Bay Watershed, but for watersheds around the world.
Author: United States. Environmental Protection Agency
Publisher:
ISBN:
Category : Environmental protection
Languages : en
Pages : 222
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Book Description
Author: Sunendra R. Joshi
Publisher:
ISBN: 9781369351491
Category :
Languages : en
Pages : 189
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Book Description
The Chesapeake Bay and its watershed suffer from varying degrees of water quality issues fueled by both point and non--point nutrient sources. Methodological limitations on source tracking and identification of the specific phosphorus (P) pools that can be biologically cycled (or remain recalcitrant) in both the short and long terms are the major obstacles preventing accurate assessment of the nutrient loads that could impact water quality. This research utilized phosphate oxygen isotope ratios, mineralogical (XRD and micro-XRD), microscopic (SEM), elemental, and spectroscopic (31P NMR and 57Fe Mössbauer) methods to characterize P speciation and investigate mechanisms and pathways of P transformations in the Chesapeake Bay and its watershed. In an agricultural soil, short-term transformation of externally applied P to a less or non-bioavailable P pool was tracked by using 18O labeled phosphate. This enabled identification of sources and precipitation pathways of acid extractable P pools. In East Creek, a tidal tributary of the Chesapeake Bay, impact of P loading primarily from agricultural runoff was reflected on the pathways and intensity of P cycling: both input flux higher than microbial cycling and remineralization (degradation of organic P) contributed to higher pore water Pi in the headwater region. In the wetland region, on the other hand, porewater Pi was completed cycled. In the Chesapeake Bay sediments, ferric Fe-bound and authigenic P pools were the two major P sinks, regardless of bottom water hypoxia. Regeneration of Pi from organic matter degradation was found to be the predominant, if not sole, pathway for authigenic P precipitation. Overall, this work generated new insights into the sources, stability, and transformations of various P pools in soils, waters, and sediments under different biogeochemical conditions. These findings are expected to be useful to watershed nutrient management plans as well as to widen source- and pathway- based research in the Chesapeake Bay and other watersheds.
Author:
Publisher:
ISBN:
Category : Nutrient pollution of water
Languages : en
Pages : 16
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309210828
Category : Political Science
Languages : en
Pages : 258
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Book Description
The Chesapeake Bay is North America's largest and most biologically diverse estuary, as well as an important commercial and recreational resource. However, excessive amounts of nitrogen, phosphorus, and sediment from human activities and land development have disrupted the ecosystem, causing harmful algae blooms, degraded habitats, and diminished populations of many species of fish and shellfish. In 1983, the Chesapeake Bay Program (CBP) was established, based on a cooperative partnership among the U.S. Environmental Protection Agency (EPA), the state of Maryland, and the commonwealths of Pennsylvania and Virginia, and the District of Columbia, to address the extent, complexity, and sources of pollutants entering the Bay. In 2008, the CBP launched a series of initiatives to increase the transparency of the program and heighten its accountability and in 2009 an executive order injected new energy into the restoration. In addition, as part of the effect to improve the pace of progress and increase accountability in the Bay restoration, a two-year milestone strategy was introduced aimed at reducing overall pollution in the Bay by focusing on incremental, short-term commitments from each of the Bay jurisdictions. The National Research Council (NRC) established the Committee on the Evaluation of Chesapeake Bay Program Implementation for Nutrient Reduction in Improve Water Quality in 2009 in response to a request from the EPA. The committee was charged to assess the framework used by the states and the CBP for tracking nutrient and sediment control practices that are implemented in the Chesapeake Bay watershed and to evaluate the two-year milestone strategy. The committee was also to assess existing adaptive management strategies and to recommend improvements that could help CBP to meet its nutrient and sediment reduction goals. The committee did not attempt to identify every possible strategy that could be implemented but instead focused on approaches that are not being implemented to their full potential or that may have substantial, unrealized potential in the Bay watershed. Because many of these strategies have policy or societal implications that could not be fully evaluated by the committee, the strategies are not prioritized but are offered to encourage further consideration and exploration among the CBP partners and stakeholders.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309069483
Category : Science
Languages : en
Pages : 422
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Book Description
Environmental problems in coastal ecosystems can sometimes be attributed to excess nutrients flowing from upstream watersheds into estuarine settings. This nutrient over-enrichment can result in toxic algal blooms, shellfish poisoning, coral reef destruction, and other harmful outcomes. All U.S. coasts show signs of nutrient over-enrichment, and scientists predict worsening problems in the years ahead. Clean Coastal Waters explains technical aspects of nutrient over-enrichment and proposes both immediate local action by coastal managers and a longer-term national strategy incorporating policy design, classification of affected sites, law and regulation, coordination, and communication. Highlighting the Gulf of Mexico's "Dead Zone," the Pfiesteria outbreak in a tributary of Chesapeake Bay, and other cases, the book explains how nutrients work in the environment, why nitrogen is important, how enrichment turns into over-enrichment, and why some environments are especially susceptible. Economic as well as ecological impacts are examined. In addressing abatement strategies, the committee discusses the importance of monitoring sites, developing useful models of over-enrichment, and setting water quality goals. The book also reviews voluntary programs, mandatory controls, tax incentives, and other policy options for reducing the flow of nutrients from agricultural operations and other sources.
Author: National Research Council
Publisher: National Academies Press
ISBN: 030913000X
Category : Nature
Languages : en
Pages : 90
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Book Description
A large area of coastal waters in the northern Gulf of Mexico experiences seasonal conditions of low levels of dissolved oxygen, a condition known as hypoxia. Excess discharge of nutrients into the Gulf of Mexico from the Mississippi and Atchafalaya rivers causes nutrient overenrichment in the gulf's coastal waters and stimulates the growth of large algae blooms. When these algae die, the process of decomposition depletes dissolved oxygen from the water column and creates hypoxic conditions. In considering how to implement provisions of the Clean Water Act to strengthen nutrient reduction objectives across the Mississippi River basin, the U.S. Environmental Protection Agency (EPA) requested advice from the National Research Council. This book represents the results of the committee's investigations and deliberations, and recommends that the EPA and U.S. Department of Agriculture should jointly establish a Nutrient Control Implementation Initiative to learn more about the effectiveness of actions meant to improve water quality throughout the Mississippi River basin and into the northern Gulf of Mexico. Other recommendations include how to move forward on the larger process of allocating nutrient loading caps-which entails delegating responsibilities for reducing nutrient pollutants such as nitrogen and phosphorus-across the basin.
Author: Scott W. Ator
Publisher: Geological Survey (USGS)
ISBN: 9781411332621
Category : Chesapeake Bay Watershed
Languages : en
Pages : 27
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Book Description
Spatially Referenced Regression on Watershed Attributes (SPARROW) was used to provide empirical estimates of the sources, fate, and transport of total nitrogen (TN) and total phosphorus (TP) in the Chesapeake Bay watershed, and the mean annual TN and TP flux to the bay and in each of 80,579 nontidal tributary stream reaches. Restoration efforts in recent decades have been insufficient to meet established standards for water quality and ecological conditions in Chesapeake Bay. The bay watershed includes 166,000 square kilometers of mixed land uses, multiple nutrient sources, and variable hydrogeologic, soil, and weather conditions, and bay restoration is complicated by the multitude of nutrient sources and complex interacting factors affecting the occurrence, fate, and transport of nitrogen and phosphorus from source areas to streams and the estuary. Effective and efficient nutrient management at the regional scale in support of Chesapeake Bay restoration requires a comprehensive understanding of the sources, fate, and transport of nitrogen and phosphorus in the watershed, which is only available through regional models. The current models, Chesapeake Bay nutrient SPARROW models, version 4 (CBTN_v4 and CBTP_v4), were constructed at a finer spatial resolution than previous SPARROW models for the Chesapeake Bay watershed (versions 1, 2, and 3), and include an updated timeframe and modified sources and other explantory terms.
Author: National Geographic Learning (Firm)
Publisher: National Geographic Learning
ISBN: 9781285359038
Category : Chesapeake Bay (Md. and Va.)
Languages : en
Pages : 0
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Book Description
A collection of articles linked together by the topic of resources of the Chesapeake Bay
