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  • 1
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    Effects of reducing nutrient loads to surface waters within the Mississippi River Basin and the Gulf of Mexico: Topic 4 Report for the Integrated Assessment on Hypoxia in the Gulf of Mexico (2021)
    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14640 | 403 | 2014-02-23 00:20:32 | 14640 | United States National Ocean Service
    Details
    Publication Date: 2021-06-30
    Description: The overall goal of this assessment was to evaluate the effects of nutrient-source reductions that may be implemented in the Mississippi River Basin (MRB) to reduce the problem of low oxygen conditions (hypoxia) in the nearshore Gulf of Mexico. Such source reductions would affect the quality of surface waters—streams, rivers, and reservoirs—in the drainage basin itself, as well as nearshore Gulf waters. The task group’s work was divided into addressing the effects of nutrient-source reductions on: (1) surface waters in the MRB and (2) hypoxia in the Gulf of Mexico.
    Keywords: Ecology ; Environment ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 130
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  • 2
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    Flux and sources of nutrients in the Mississippi-Atchafalaya River Basin: Topic 3 Report for the Integrated Assessment on Hypoxia in the Gulf of Mexico. (2021)
    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14641 | 403 | 2014-02-24 00:14:08 | 14641 | United States National Ocean Service
    Details
    Publication Date: 2021-06-30
    Description: Ths report addresses the following two questions:1) What are the loads (flux) of nutrients transported from the Mississippi-Atchafalaya River Basin to the Gulf of Mexico, and where do they come from within the basin?2) What is the relative importance of specific human activities, such as agriculture, point-source discharges, and atmospheric deposition in contributing to these loads?These questions were addressed by first estimating the flux of nutrients from the Mississippi-Atchafalaya River Basin and about 50 interior basins in the Mississippi River system using measured historical streamflow and water quality data. Annual nutrient inputs and outputs to each basin were estimated using data from the National Agricultural Statistics Service, National Atmospheric Deposition Program, and point-source data provided by the USEPA. Next, a nitrogen mass balance was developed using agricultural statistics, estimates of nutrient cycling in agricultural systems, and a geographic information system. Finally, multiple regression models were developed to estimate the relative contributions of the major input sources to the flux of nitrogen and phosphorus to the Gulfof Mexico.
    Keywords: Ecology ; Environment ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 130
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  • 3
    Electronic Resource
    Electronic Resource
    Concentration of heavy metals in sediment cores from selected Wisconsin lakes (1974)
    s.l. : American Chemical Society
    Environmental science & technology 8 (1974), S. 165-170 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60087a001
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  • 4
    Electronic Resource
    Electronic Resource
    Aqua regia for quantitative recovery of mercuric sulfide from sediments (1974)
    s.l. : American Chemical Society
    Environmental science & technology 8 (1974), S. 267-268 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60088a002
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  • 5
    Electronic Resource
    Electronic Resource
    Prediction of the quality of water in a proposed impoundment in Southwestern Wisconsin, USA (1978)
    Springer
    Environmental geology 2 (1978), S. 341-349 
    Details
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The probable quality of water in a large multipurpose impoundment under construction in the driftless area of southwestern Wisconsin was determined by using stream monitoring data, statistical information, and literature values for point and nonpoint nutrient loading. The impoundment drainage basin is largely rural, and much of the area slopes steeply. Point sources of N and P (sewage treatment plants and farmyards) are small relative to nonpoint sources (runoff from agriculture and forest lands). Stream flow and nutrient concentration are positively related. The major fraction of the nutrient input is from runoff from snowmelt and from early summer storms. The calculated annual loadings of total N and total P were compared to accepted static and dynamic models to predict the resultant water quality. These comparisons indicated that the impoundment would be heavily overloaded with P and so would be highly eutrophic. Owing to the nonpoint nature of the nutrient sources, they would be difficult and expensive to control. Partly as a result of this assessment, further funding for the impoundment was withdrawn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380508
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  • 6
    Electronic Resource
    Electronic Resource
    Soil nitrogen mineralization as affected by water and temperature interactions (1987)
    Springer
    Biology and fertility of soils 5 (1987), S. 248-252 
    Details
    ISSN: 1432-0789
    Keywords: Hydrothermal factor-Q10 ; Organic matter decomposition ; Arrhenius equation ; Simulation models ; Nitrogen mineralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The hypothesis that water and temperature interact to influence the rate of soil N mineralization was studied in laboratory incubation experiments with two contrasting soils. Small sample rings (10 mm tall, 50 mm diameter) were packed to uniform bulk density with 1–2 mm aggregates of Plano silt loam and Wacousta silty clay loam. Samples were brought to five different water potentials (−0.1, −0.33, −0.5, −1.0, −3.0 bars) using pressure-plate techniques, and the undisturbed sample rings were then incubated at 10–35°C for 3, 10 or 14 days. The concentration of soil exchangeable NH4 +-N and NO3 −-N was measured at the end of each incubation period on replicate samples. The Q10 of N mineralization was approximately 2 for all tested water potentials. Soil N mineralization was linearly related to water content or log water potential, but no water-temperature interaction was evident. The Q10 was constant with water content, and the scaled water content-N mineralization relationship was constant with temperature. We recommend the use of scaling approaches for assessing interactive effects between water and other environmental factors on N turnover in soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256909
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  • 7
    Electronic Resource
    Electronic Resource
    Nitrogen nutrition of Myriophyllum spicatum: variation of plant tissue nitrogen concentration with season and site in Lake Wingra (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 6 (1976), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Samples of water, sediment and Myriophyllum spicatum were collected from four weedbed sites in Lake Wingra, a small hypereutrophic hardwater lake in Madison, Wisconsin, several times during the 1972 and 1973 growing seasons, and analysed for various forms of N. The concentrations of inorganic N in the lake water were quite similar at all sites. The differences in the total N content of the Myriophyllum tissue from site to site directly related to the levels of available sediment N, indicating a dependence upon the sediment as a N source. Myriophyllum tissue N concentrations (ash and moisture-free basis) were highest in spring, decreased steadily during the summer, and increased again in the fall. Myriophyllum apparently grows very little during the winter, but continues to accumulate N. The death and decay of a considerable portion of the Myriophyllum in the fall contributes insignificant amounts of N directly to the lake water. Nitrogen does not appear to be limiting Myriophyllum spicatum growth in Lake Wingra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1976.tb01597.x
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  • 8
    Electronic Resource
    Electronic Resource
    Nitrogen nutrition of Myriophyllum spicatum: uptake and translocation of 15N by shoots and roots (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 6 (1976), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Intact Myriophyllum spicatum plants were grown in compartmentalized containers in a growth room so that the roots were separated from the shoots by a watertight partition. Nitrogen 15N was added to the water or sediment to trace the uptake of inorganic N by the plant shoots or roots. Myriophyllum spicatum is capable of taking up inorganic N through both roots and shoots. Plant N requirements can apparently be met by root uptake alone. However, when about 0·1 mg/l of NH4-N were present in the water, foliar uptake supplied more N to the plants than did root uptake. Foliar uptake of NH4-N was found to be several times faster than that of NO3-N when both forms of N were present in the water. Only about 1% of the N taken up by the roots was subsequently released to the water through the foliage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1976.tb01598.x
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  • 9
    Electronic Resource
    Electronic Resource
    Agriculture and the Citizen. Colin R.W. Spedding. (1998)
    Springer
    Crop science 38 (1998), S. 277-277 
    Details
    ISSN: 1435-0653
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 10
    Electronic Resource
    Electronic Resource
    Nitrogen and phosphorus release from decaying water milfoil (1973)
    Springer
    Hydrobiologia 42 (1973), S. 509-525 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To evaluate the net N and P contribution to water from herbicide-killed aquatic weeds, water milfoil containing 1.5% N and 0.30% P was killed with endothal and allowed to decompose, in the dark, in water only or sediment-water systems. Changes with time in dry weight, total N and P, and organic C in the plant material, and organic and inorganic forms of N and P in the water were determined. Plant decompostion was limited by N. Inorganic N was released by the sediment, and decomposition was more rapid when sediment was present. A smaller N requirement for decomposition under conditions of low O2 was postulated as a possible explanation of the more rapid decomposition observed in the absence of aeration. The presence of plant P in excess of decomposition requirements resulted in rapid accumulation of organic P, followed by inorganic P, in the water. Organic N appeared in the water early in the experiments, but was depleted rapidly, and inorganic N was apparently immobilized as soon as it was formed. In the presence of sediment, organic N and inorganic P levels were much lower. On treating of water milfoil with herbicide, rapid P release can be expected. This P can either be utilized in further biomass production or be sorbed by the sediment. Insufficient data were available to reach definite conclusions regarding N. It would appear, however, that N release from decaying weeds is much slower than P.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00047023
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