Non-point source loadings of nutrients and dissolved organic carbon from an agricultural-suburban watershed in East central Florida

Dierberg, Forrest E.

doi:10.1016/0043-1354(91)90073-y

Cited by 19 publications

(11 citation statements)

References 16 publications

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“…The speciation ofP in the western catchments showed that TDP concentrations were greater than their MRP counterparts and that a large proportion of T P was in particulate form (Table 2). This implies that in these catchments, a major proportion of T P transport from agricultural land to the aquatic environments occurs in non-MRP andlor particulate forms of P. These findings are consistent with other similar studies (Sharpley & Manzel, 1987;Dierberg, 1991;Dorioz & Ferhi, 1994;Nearing etal., 1993;Sharpley & Withers, 1994;Hodgkinson &Withers, 1996). Annual MRP losses (kg Plha) represented only a small amount of the total P lost from the catchments (Table 3), dissolved andlor particulate P contributed a major share of the total annualp losses.…”

Section: Phosphorus Concentrations and Outputs In Stream Flowsupporting

confidence: 92%

Soil and land use effects on phosphorus in six streams draining small agricultural catchments in Scotland

Hooda¹,

Moynagh²,

Svoboda³

et al. 1997

Soil Use and Management

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Phosphorus concentrations and outputs have been compared and contrasted in six small agricultural catchments in the west and northeast of Scotland.The loss of P from soils to stream waters was more from catchments with intensive dairy cattle farming in the west than from the less intensively stockedlarable catchments in the northeast, with striking differences being seen between the two regions. In the northeast, intensive animal farming caused less P loss in drainage water than arable management.Larger mean annual concentrations were seen in the west (0.076-0.142 mg P04-P/l as molybdate-reactive phosphate-MRP) compared with the northeast (0.012-0.025 mg PO,-P/l), a feature caused by the combination of limited P-retention in the western Gleysols and smaller inputs to the largely-podzolic northeastern catchments. Stream concentrations were decreased by dilution during winter storm flows and increased during summer baseflow and at the beginning of soil rewetting in autumn.

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Section: Phosphorus Concentrations and Outputs In Stream Flowsupporting

confidence: 92%

Soil and land use effects on phosphorus in six streams draining small agricultural catchments in Scotland

Hooda¹,

Moynagh²,

Svoboda³

et al. 1997

Soil Use and Management

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“…DOP and DON loads are greater during winter high¯ow periods, suggesting that diuse sources are the main contributor of these fractions during that season. Also, as discussed above, DOP and DON¯uxes are closely associated with the DOC dynamics of the river system such that maximum DOP and DON concentrations and contributions to total loads might be expected at times of high¯ow, because DOC concentrations commonly exhibit a positive correlation with discharge (Dierberg, 1991;Grieve, 1994). However, the contributions of DOP and DON to monthly TP and TN loads in the study This pattern may re¯ect seasonal trends in DOC concentrations, which have been found in other catchments to peak in summer, owing to higher rates of organic matter decomposition within the river basin, and because of a concentration eect in low¯ows (Moore, 1987;Grieve, 1990).…”

Section: Seasonal Variationsmentioning

confidence: 95%

The composition of nutrient fluxes from contrasting UK river basins

et al. 1998

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Abstract:Accurate estimates of N and P loads were obtained for four contrasting UK river basins over a complete annual cycle. The fractionation of these loads into dissolved and particulate, and inorganic and organic components allowed a detailed examination of the nutrient load composition and of the factors in¯uencing both the relative and absolute magnitude of these components. The particulate phosphorus (TPP) loads account for 26±75% of the annual total phosphorus (TP) transport and are predominantly inorganic. The inorganic (PIP) and organic (POP) fractions of the TPP loads represent 20±47% and 6±28% of the annual TP transport, respectively. In contrast, the particulate nitrogen loads (TPN) represent 8% or less of the annual total nitrogen (TN) loads and are predominately organic. For dissolved P transport, the dissolved inorganic fraction (DIP) is more important, representing 15±70% of the TP loads, whereas the dissolved organic fraction (DOP) represents only 3±9% of the TP loads. The TN loads are dominated by the dissolved component and more particularly the total oxidized fraction (TON), which is composed of nitrate and nitrite and represents 76±82% of the annual TN transport. The remaining dissolved N species, ammonium (NH 4 -N) and organic N (DON) account for 0 . 3±1 . 2% and 13±16% of the annual TN transport, respectively. The TPN and TPP¯uxes closely re¯ect the suspended sediment dynamics of the study basins, which are in turn controlled by basin size and morphology. The dissolved inorganic nutrient¯uxes are in¯uenced by point source inputs to the study basins, especially for P, although the TON¯ux is primarily in¯uenced by diuse source contributions and the hydrological connectivity between the river and its catchment area. The dissolved organic fractions are closely related to the dissolved organic carbon (DOC) dynamics, which are in turn in¯uenced by land use and basin size. The magnitude of the NH 4 -N fraction was dependent on the proximity of the monitoring station to point source discharges, because of rapid nitri®cation within the water column. However, during storm events, desorption from suspended sediment may be temporarily important. Both the magnitude and relative contribution of the dierent nutrient fractions exhibit signi®cant seasonal variability in response to the hydrological regime, sediment mobilization, the degree of dilution of point source inputs and biological processes. #

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“…Most surface-water nutrient studies have been done on a river-basin or smaller areal scale. Some of these studies were intended to evaluate the relation of nutrient runoff to various land uses or to determine the effects of various land-use practices (for example, Bormann and others, 1968;Dierberg, 1991;Stottlemyer andTroendle, 1992;and Fishel and others, 1993). Other studies were intended to determine nutrient inputs to lakes, reservoirs, bays, or estuaries (for example, Edmondson and Lehman, 1981;Rosensteel and Strom, 1991;Hager and Schemel, 1992;and Jaworski and others, 1992).…”

Section: Nutrients In Surface Water Of the United Statesmentioning

confidence: 99%

Nutrients in ground water and surface water of the United States; an analysis of data through 1992

1995

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FOREWORDThe mission of the U.S. Geological Survey (USGS) is to assess the quantity and quality of the earth resources of the Nation and to provide information that will assist resource managers and policymakers at Federal, State, and local levels in making sound decisions. Assessment of water-quality conditions and trends is an important part of this overall mission.One of the greatest challenges faced by waterresources scientists is acquiring reliable information that will guide the use and protection of the Nation's water resources. That challenge is being addressed by Federal, State, interstate, and local water-resource agencies and by many academic institutions. These organizations are collecting water-quality data for a host of purposes that include: compliance with permits and water-supply standards; development of remediation plans for a specific contamination problem; operational decisions on industrial, wastewater, or water-supply facilities; and research on factors that affect water quality. An additional need for water-quality information is to provide a basis on which regional and national-level policy decisions can be based. Wise decisions must be based on sound information. As a society, we need to know whether certain types of water-quality problems are isolated or ubiquitous, whether there are significant differences in conditions among regions, whether the conditions are changing over time, and why these conditions change from place to place and over time. The information can be used to help determine the efficacy of existing, water-quality policies and to help analysts determine the need for and likely consequences of new policies.To address these needs, the Congress appropriated funds in 1986 for the USGS to begin a pilot program in seven project areas to develop and refine the National Water-Quality Assessment (NAWQA) Program. In 1991, the USGS began full implementation of the program. The NAWQA Program builds upon an existing base of water-quality studies of the USGS, as well as those of other Federal, State, and local agencies. The objectives of the NAWQA Program are to:Describe current water-quality conditions for a large part of the Nation's freshwater streams, rivers, and aquifers.Describe how water quality is changing over time.Improve understanding of the primary natural and human factors that affect water-quality conditions. This information will help support the development and evaluation of management, regulatory, and monitoring decisions by other Federal, State, and local agencies to protect, use, and enhance water resources. The goals of the NAWQA Program are being achieved through ongoing and proposed investigations of 60 of the Nation's most important river basins and aquifer systems, which are referred to as study units. These study units are distributed throughout the Nation and cover a diversity of hydrogeologic settings. More than two-thirds of the Nation's freshwater use occurs within the 60 study units and more than two-thirds of the people served by public water-supply sy...

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Non-point source loadings of nutrients and dissolved organic carbon from an agricultural-suburban watershed in East central Florida

Cited by 19 publications

References 16 publications

Soil and land use effects on phosphorus in six streams draining small agricultural catchments in Scotland

Soil and land use effects on phosphorus in six streams draining small agricultural catchments in Scotland

The composition of nutrient fluxes from contrasting UK river basins

Nutrients in ground water and surface water of the United States; an analysis of data through 1992

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