Trends in nutrient concentrations, loads, and yields in streams in the Sacramento, San Joaquin, and Santa Ana Basins, California, 1975-2004

Kratzer, Charles R.; Kent, Robert; Seleh, Dina K.; Knifong, Donna L.; Dileanis, Peter D.; Orlando, James L.

doi:10.3133/sir20105228

Cited by 14 publications

(25 citation statements)

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“…Since 1989, several programs have focused on riparian restorations in the Central Valley of California with improving water quality as an important ecosystem service goal (Furman 1989;CDWR 2009;Griggs 2009). Agricultural discharge transported through sediments, groundwater and surface runoff is a major concern in the SJR (Kratzer et al 2011;Clayton and Muleta 2012) due to the potential for wide spread hypoxia in the downstream Sacramento-San Joaquin Delta-Estuary (Jassby and Van Nieuwenhuyse 2005;Zamora et al 2012). Nitrate concentrations in surface waters of the SJR can range up to 4 mg NO 3 --N L -1 , whereas groundwater within these riparian zones have reported nitrate concentrations as high as 14 mg L -1 (Zamora et al 2012) and up to 30 mg L -1 in groundwater from nearby dairy fields (Esser et al 2009).…”

Section: Anthropogenic Activity Has Drastically Altered the Global Nimentioning

confidence: 99%

Nitrous oxide fluxes and dissolved N gases (N2 and N2O) within riparian zones along the agriculturally impacted San Joaquin River

Hinshaw

Dahlgren

2016

Nutr Cycl Agroecosyst

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TitleNitrous oxide fluxes and dissolved N gases (N2 and N2O) within riparian zones along the agriculturally impacted San Joaquin River ? and NO 3 -, while benthic N 2 O fluxes were regulated by variations in dissolved oxygen and river flow. Higher fluxes in the riparian soils in 2011 were attributed to several months of flooding that significantly impacted groundwater tables and nutrient availability. Dissolved N 2 O from groundwater within the riparian zones was not found to be a significant factor contributing to atmospheric fluxes. These results suggest that riparian zones within the agriculturally impacted San Joaquin River were a significant source of N 2 O when elevated NO 3 -was present. Different controlling factors for fluxes within benthic sediments suggested that riparian vegetation did not play a role in NO 3 -concentrations or fluxes within the surface water.

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Section: Anthropogenic Activity Has Drastically Altered the Global Nimentioning

confidence: 99%

Nitrous oxide fluxes and dissolved N gases (N2 and N2O) within riparian zones along the agriculturally impacted San Joaquin River

Hinshaw

Dahlgren

2016

Nutr Cycl Agroecosyst

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“…The Sacramento and San Joaquin rivers deliver the largest loads of nutrients to the Delta, with municipal and agricultural discharge contributing the bulk of these loads (Kratzer et al 2011). Agricultural discharges include both irrigation return flows that transport fertilizer and soil-derived nutrients and discharge from dairies and feedlots.…”

Section: Nutrient Inputs Into the Delta From Tributary Rivers And Thementioning

confidence: 99%

“…Although the Sacramento River delivers the largest nutrient loads to the Delta, loading from the San Joaquin River is particularly large, given its size. This is most evident in summer, when the San Joaquin contributes almost half the total nitrogen load to the Delta despite flows less than 20% of the Sacramento (Kratzer et al 2011). However, water exports from the south Delta divert much of the San Joaquin River water, reducing the effect of these nutrients on the greater Delta (Schlegel and Domagalski 2015).…”

Section: Nutrient Inputs Into the Delta From Tributary Rivers And Thementioning

confidence: 99%

“…Trends in nutrient inputs to the Delta via the Sacramento and San Joaquin rivers have been assessed (Kratzer and Shelton 1998;Cloern 2001;Kratzer et al 2004;Kratzer et al 2011;Schlegel and Domagalski 2015). It is important to note that these compilations use as their furthest-downstream reporting station Freeport on the Sacramento River, and Vernalis on the San Joaquin River, which are upstream of the major wastewater treatment plants that serve the Sacramento region and Stockton, respectively.…”

Section: Concentrations and Trendsmentioning

confidence: 99%

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Nutrient Dynamics of the Delta: Effects on Primary Producers

Dahm¹,

Parker²,

Adelson³

et al. 2016

SFEWS

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Increasing clarity of Delta waters, the emergence of harmful algal blooms, the proliferation of aquatic water weeds, and the altered food web of the Delta have brought nutrient dynamics to the forefront. This paper focuses on the sources of nutrients, the transformation and uptake of nutrients, and the links of nutrients to primary producers. The largest loads of nutrients to the Delta come from the Sacramento River with the San Joaquin River seasonally important, especially in the summer. Nutrient concentrations reflect riverine inputs in winter and internal biological processes during periods of lower flow with internal nitrogen losses within the Delta estimated at approximately 30% annually. Light regime, grazing pressure, and nutrient availability influence rates of primary production at different times and locations within the Delta. The roles of the chemical form of dissolved inorganic nitrogen in growth rates of primary producers in the Delta and the structure of the open-water algal community are currently topics of much interest and considerable debate. Harmful algal blooms have been noted since the late 1990s, and the extent of invasive aquatic macrophytes (both submerged and free-floating forms) has increased especially during years of drought. Elevated nutrient loads must be considered in terms of their ability to support this excess biomass. Modern sensor technology and networks are now deployed that make high-frequency measurements of nitrate, ammonium, and phosphate. Data from such instruments allow a much more detailed assessment of the spatial and temporal dynamics of nutrients. Four fruitful directions for future research include utilizing continuous sensor data to estimate rates of primary production and ecosystem respiration, linking hydrodynamic models of the Delta with the transport and fate of dissolved nutrients, studying nutrient dynamics in various habitat types, and exploring the use of stable isotopes to trace the movement and fate of effluent-derived nutrients.

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“…Nutrient concentrations have been increasing in the SFE over time due to agricultural and urban runoff, and increased WWTP discharges, but discharge from Sacramento Regional WWTP is the main source of NH + 4 in the upper SFE (Jassby, 2008). The Sacramento Regional WWTP currently employs secondary treatment that does not include a nitrification step, and thus the majority of N in the final effluent is in the form of NH (Kratzer et al 2001;Foe et al, 2010). NH + 4 discharge from WWTPs is of particular concern in the SFE because several studies have indicated that elevated concentrations of NH + 4 may be causing changes in phytoplankton species abundance and productivity (Dugdale et al, 2007(Dugdale et al, , 2012Glibert et al, 2011;Parker et al, 2012b).…”

Section: Introductionmentioning

confidence: 99%

Use of Flow Cytometry and Stable Isotope Analysis to Determine Phytoplankton Uptake of Wastewater Derived Ammonium in a Nutrient-rich River

Schmidt¹

University of San Francisco Scholarship Repository

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Abstract. Anthropogenic alteration of the form and concentration of nitrogen (N) in aquatic ecosystems is widespread. Understanding availability and uptake of different N sources at the base of aquatic food webs is critical to establishment of effective nutrient management programs. Stable isotopes of N ( 14 N, 15 N) are often used to trace the sources of N fueling aquatic primary production, but effective use of this approach requires obtaining a reliable isotopic ratio for phytoplankton.In this study, we tested the use of flow cytometry to isolate phytoplankton from bulk particulate organic matter (POM) in a portion of the Sacramento River, California, during riverscale nutrient manipulation experiments that involved halting wastewater discharges high in ammonium (NH + 4 ). Field samples were collected using a Lagrangian approach, allowing us to measure changes in phytoplankton N source in the presence and absence of wastewater-derived NH

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Trends in nutrient concentrations, loads, and yields in streams in the Sacramento, San Joaquin, and Santa Ana Basins, California, 1975-2004

Cited by 14 publications

References 0 publications

Nitrous oxide fluxes and dissolved N gases (N2 and N2O) within riparian zones along the agriculturally impacted San Joaquin River

Nitrous oxide fluxes and dissolved N gases (N2 and N2O) within riparian zones along the agriculturally impacted San Joaquin River

Nutrient Dynamics of the Delta: Effects on Primary Producers

Use of Flow Cytometry and Stable Isotope Analysis to Determine Phytoplankton Uptake of Wastewater Derived Ammonium in a Nutrient-rich River

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