Science Inventory

Search Criteria: the term 'nitrogen OR phosphorus OR nutrient' in any part of any record.
  • Archive Status = Active

  •   (Sorted by Relevance Rank)
    Records 1 to 25 of 595

    Nitrogen uptake and allocation estimates for Spartina alterniflora and Distichlis spicata (JOURNAL)
    Salt marshes have the potential to intercept nitrogen that could otherwise impact coastal water quality. Salt marsh plants play a central role in nutrient interception by retaining N in above- and belowground tissues. We examine N uptake and allocation in two dominant salt marsh ...
    Seasonal disconnect between hydrology and retention drives riverine nitrogen export Willamette River Basin, Oregon (PRESENTATION)
    Watershed nutrient balance studies traditionally focus on annual timescales to examine factors controlling landscape level nutrient inputs, processing, and export. In areas with strongly seasonal precipitation, leaching losses may be greater during wet seasons when hydrologic fo...
    Long-term trends in total inorganic nitrogen and sulfur deposition in the US from 1990 to 2010 (JOURNAL)
    Excess deposition (including both wet and dry deposition) of nitrogen and sulfur are detrimental to ecosystems. Recent studies have investigated the spatial patterns and temporal trends of nitrogen and sulfur wet deposition, but few studies have focused on dry deposition due to t...
    Integrated Science Assessment (ISA) for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter Ecological Criteria (Second External Review Draft) (ASSESSMENT DOCUMENT)
    This draft Integrated Science Assessment (ISA) represents a concise synthesis and evaluation of the most policy-relevant science and will ultimately provide the scientific bases for EPA’s decision on retaining or revising the current secondary standards for NO<sub>2</sub>, SO<sub...
    Contributions to the Nutrient Toolbox: Identifying Drivers, Nutrient Sources, and Attribution of Exceedances (PRESENTATION)
    Nutrients are a leading cause of impairments in the United States, and as a result tools are needed to identify drivers of nutrients and response variables (such as chlorophyll a), nutrient sources, and identify causes of exceedances of water quality thresholds. This presentatio...
    Quantifying Periphyton Community Responses to Nutrients in a Southeast Coastal Plain Watershed using a Molecular Approach (PRESENTATION)
    Nutrient (nitrogen and phosphorus) pollution is a water quality issue in the US, including within the southeastern states that comprise US EPA Region 4. Biotic condition of southeastern streams with respect to nutrients has been evaluated using biological indicators based on mac...
    Comparative Emergy Evaluation of Nutrient Removal and Nutrient Recovery Technologies and the Implications to Nutrient Management (PRESENTATION)
    The urbanization of the modern community creates large population centers that generate concentrated wastewater. A large expenditure on wastewater treatment has to be invested to make a modern city function without human and environmental health problems. Society relies on syste...
    Nitrogen input inventory in the Nooksack-Fraser Transboundary Region: Key component of an international nitrogen management study (PRESENTATION)
    The Nooksack-Abbotsford-Sumas (NAS) Transboundary Watershed, spanning which spans a portion of the western interface of British Columbia, Washington State, and the Lummi Nation and the Nooksack Tribal lands , supports agriculture, estuarine fisheries, diverse wildlife, and urban ...
    Latitudinal gradients in oceanic and watershed nitrogen sources to Pacific coast estuaries of North America (PRESENTATION)
    To assess the relative importance of terrestrial versus oceanic nutrient sources, we assembled natural abundance nitrogen stable isotope (&delta;15N) data for nitrate, green macroalgae, seagrass (Zostera marina) and mussels in the nearshore and in estuaries along the west coast o...
    Unexpected Responses of autotrophs to nutrient loading: Influence of water residence time on eutrophication expression (PRESENTATION)
    Water residence time may critically influence the expression of estuarine eutrophication symptoms such as phytoplankton blooms, anoxia/hypoxia, build-up of organic matter, and altered community composition. While a conceptual model was developed in the late 1990&rsquo;s; pioneer...
    Comparative analysis of long-term chlorophyll data with generalized additive model - San Francisco Bay and St. Lucie Estuary (PRESENTATION)
    The health of estuarine ecosystems is often influenced by hydraulic and nutrient loading from upstream watersheds. We examined four decades of monitoring data of nutrient export into the Indian River Lagoon and San Francisco Bay, both of which have received considerable attentio...
    Organic nitrogen in aerosols at a forest site in southern Appalachia (PRESENTATION)
    This study investigates the composition of organic particulate matter (PM2.5) in a remote montane forest in the southeastern U.S., focusing on the role of organic nitrogen (N) in sulfur-containing secondary organic aerosol (SOA) and aerosols associated with biomass burning. Meas...
    Linking terrestrial phosphorus inputs to riverine export across the United States (JOURNAL)
    Humans have greatly accelerated phosphorus (P) flows from land to aquatic ecosystems, causing eutrophication, harmful algal blooms, and hypoxia. A variety of statistical and mechanistic models have been used to explore the relationship between P management on land and P losses to...
    Modeling Historical and Projected Future Atmospheric Nitrogen Loading to the Chesapeake Bay Watershed (PRESENTATION)
    Land use and climate change are expected to alter key processes in the Chesapeake Bay watershed and can potentially exacerbate the impact of excess nitrogen. Atmospheric sources are one of the largest loadings of nitrogen to the Chesapeake Bay watershed. In this study, we explore...
    Modeling the Air-Vegetation-Soil Exchange of Reactive Nitrogen (PRESENTATION)
    Nitrogen is an essential building block of all proteins and thus an essential nutrient for all life. However, in excess reactive nitrogen can lead to poor air or water quality, loss of biodiversity, and impact respiratory and cardiac health. Human activity has perturbed this cycl...
    Projections of Atmospheric Nutrient Deposition to the Chesapeake Bay Watershed (PRESENTATION)
    Atmospheric deposition remains one of the largest loadings of nutrients to the Chesapeake Bay watershed. The interplay between future land use, climate, and emission changes, however, will cause shifts in the future nutrient deposition regime (e.g., oxidized vs. reduced nitrogen...
    Attributes of Successful Nutrient Management? - Implications for Recovery of Indian River Lagoon (PRESENTATION)
    This presentation was an invited keynote address, which was based on a published paper: Gross, C. and J. D. Hagy, 3rd (2017). &quot;Attributes of successful actions to restore lakes and estuaries degraded by nutrient pollution.&quot; J Environ Manage 187: 122-136. As more succes...
    New, national bottom-up estimate for tree-based biological nitrogen fixation in the US (PRESENTATION)
    Nitrogen is a limiting nutrient in many ecosystems, but is also a chief pollutant from human activity. Quantifying human impacts on the nitrogen cycle and investigating natural ecosystem nitrogen cycling both require an understanding of the magnitude of nitrogen inputs from biolo...
    Nitrogen input inventory in the Nooksack-Abbotsford-Sumas Transboundary Region: Key component of an international nitrogen management study. (PRESENTATION)
    Background/Question/Methods: Nitrogen (N) is an essential biological element, so optimizing N use for food production while minimizing the release of N and co-pollutants to the environment is an important challenge. The Nooksack-lower Fraser Valley, spanning a portion of the w...
    Development of an epiphyte indicator of nutrient enrichment: A critical evaluation of observational and experimental studies (JOURNAL)
    An extensive review of the literature on epiphytes on submerged aquatic vegetation (SAV), primarily seagrasses but including some brackish and freshwater rooted macrophytes, was conducted in order to evaluate the evidence for response of epiphyte metrics to increased nutrients. ...
    Nitrogen input inventory in the Nooksack-Abbotsford-Sumas Transboundary Region: Key component of an international nitrogen management study (PRESENTATION)
    Nitrogen (N) is an essential biological element, so optimizing N use for food production while minimizing the release of N and co-pollutants to the environment is an important challenge. The Nooksack-Abbotsford-Sumas Transboundary (NAS) Region, spanning a portion of the western...
    Trends in nitrogen isotope ratios of juvenile winter flounder reflect changing nitrogen inputs to Rhode Island, USA estuarine systems (JOURNAL)
    Nitrogen isotope ratios (d 15N) in juvenile winter flounder, Pseudopleuronectes americanus, were used to examine changes in nitrogen inputs to several Rhode Island, USA estuarine systems. Fish were collected over two three-year periods with a ten-year interval between sampling pe...
    Using Stable Isotopes to Assess Connectivity: the Importance of Oceanic and Watershed Nitrogen Sources for Estuarine Primary Producers (PRESENTATION)
    Estuaries located at the interface of terrestrial and oceanic ecosystems receive nutrients from both ecosystems. Stable isotopes of primary producers and consumers are often used as an indicator of nutrient sources. We assembled natural abundance nitrogen stable isotope (δ15N) d...
    Modeling and Recent Shift in the Composition of Atmospheric Reactive Nitrogen (PRESENTATION)
    Nitrogen is an essential building block of all proteins and thus an essential nutrient for all life. Reactive nitrogen, which is naturally produced via enzymatic reactions, forest fires and lightning, is continually recycled and cascades through air, water, and soil media. Human ...
    Chronic Nitrogen Deposition Influences the Chemical Dynamics of Leaf Litter and Fine Roots During Decomposition (JOURNAL)
    Atmospheric nitrogen deposition induces a forest carbon sink across broad parts of the Northern Hemisphere; this carbon sink may partly result from slower litter decomposition. Although microbial responses to experimental nitrogen deposition have been well-studied, evidence linki...