Nitrogen Uptake and Release in a Forested Watershed, Lake Tahoe Basin, California

Coats, Robert; Leonard, Robert L.; Goldman, Charles R.

doi:10.2307/1941064

Cited by 59 publications

(44 citation statements)

References 13 publications

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“…Even so, Coats et al (1976) reported NO 3 --N loading into the lake from Ward Creek to be fairly small. It would appear that release of NO 3 --N from such disturbances as home construction can be mitigated fairly rapidly with prompt revegetation of the site.…”

Section: Chaptermentioning

confidence: 96%

“…Examples include Glancy (1969Glancy ( , 1982, Dugan and McGauhey (1974), Goldman (1974), Kroll (1976), Leonard et al (1979), California Department of Conservation (1969), Perkins et al (1975), Coats et al (1976), California Tahoe Conservancy (1987, Garcia (1988), Loeb (1990), Woyshner and Hecht (1990), Reuter et al (1990), , Lowry et al (1994). No attempt is made here to summarize all the data available on this topic.…”

Section: What Is the Evidence Linking Tributary Sediment And Nutrientmentioning

confidence: 99%

“…Nitrate content in runoff from open areas has been found in greater quantities than in surface runoff from wooded sites (Figure 4-13). In contrast, conifer stands in the Tahoe basin have been found to be efficient at removing nitrate from precipitation (Naslas et al 1994;Coats et al 1976). When a wooded site was disturbed through litter removal or soil raking, the nitrate discharge increased, but not to the level of the open sites.…”

Section: Plot Conditionmentioning

confidence: 99%

“…Vegetation consists of conifers, meadow plants, and mountain alder. Coats et al (1976) studied Ward Creek to evaluate the effect of soil disturbance on nitrogen concentrations in tributary discharge water. At the time of the study the watershed was relatively undeveloped, but logging and road construction had disturbed large areas.…”

Section: Watershed Processes Affecting Nutrient Cycling and Transportmentioning

confidence: 99%

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Lake Tahoe watershed assessment: volume I

Murphy¹,

Knopp²

2000

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The United States Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, gender, religion, age, disability, political beliefs, sexual orientation and marital or family status. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) This watershed assessment of the Lake Tahoe basin in northern California and Nevada is the first attempt to collate, synthesize, and interpret available scientific information with a comprehensive view toward management and policy outcomes. The seven-chapter report presents new and existing information in subject areas pertinent to policy development and land and resource management in the basin, including environmental history, air quality, watershed dynamics and water quality, biological integrity, and socioeconomic conditions. Key findings report the extent of recent climatic changes, historic accounts of past environmental disturbances, state of our understanding of why the Lake's clarity is declining, significant role that air quality plays in the decline, and an initial nutrient budget for nitrogen and phosphorous that are believed to fuel algae growth. In addition, important new work related to old-growth forests, the risk of wildfire and the conservation of biological diversity in the basin have helped to broaden our perspective of the interrelated nature of the environmental challenge facing the basin. A detailed analysis of institutional arrangements and capacities in the Lake Tahoe basin is presented in the context of environmental decision-making.

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Section: Chaptermentioning

confidence: 96%

Section: What Is the Evidence Linking Tributary Sediment And Nutrientmentioning

confidence: 99%

Section: Plot Conditionmentioning

confidence: 99%

Section: Watershed Processes Affecting Nutrient Cycling and Transportmentioning

confidence: 99%

See 2 more Smart Citations

Lake Tahoe watershed assessment: volume I

Murphy¹,

Knopp²

2000

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“…The persisting increase (or decrease) in nitrogen availability has been extensively discussed: long-term effects [15,88], rapid increase [92] followed by a long term decrease in nitrogen availability by accumulation in residue and humus. For Vitousek et al [90], the long term effect essentially depends on the influence of the weather on the decomposition rate.…”

Section: Nitrogen Availabilitymentioning

confidence: 99%

Effects of a clear-cut on the in situ nitrogen mineralisation and the nitrogen cycle in a 67-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation

et al. 2004

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-In situ net nitrogen mineralisation, deposition, uptake and leaching fluxes were determined in a 67-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation in the Beaujolais mountains. Measurements were performed during five years before the clear-cut of the stand and two years after the clear-cut. Deposition and mineralisation of N decreased after the harvest. The drastic decrease in tree N uptake was counteracted by the developing understorey vegetation. Microbial immobilisation, favoured by the input of organic matter and the increase in temperature, was probably the cause of a decrease in the net mineralisation of N. Leaching of mineral N at 15 cm depth decreased after the harvest. However, fluxes of Mg and Ca leached at 60 cm depth did not vary after the harvest.nitrogen cycle / clear-cut / Pseudotsuga menziesii / leaching / soil Résumé -Effet de la coupe à blanc d'une plantation de Douglas (Pseudotsuga menziesii (Mirb.) Franco) de 67 ans, sur la production in situ d'azote minéral et sur le cycle de l'azote. La minéralisation nette, les dépôts, l'absorption et le drainage d'azote ont été mesurés in situ dans une plantation de Douglas (Pseudotsuga menziesii (Mirb.) Franco) de 67 ans, située sur sol acide dans les monts du Beaujolais. Les mesures ont été effectuées pendant cinq ans avant la coupe à blanc du peuplement, puis pendant 2 ans après la coupe. Les dépôts d'azote atmosphérique et la minéralisation de l'azote diminuent après la récolte. La diminution du prélèvement d'azote par les racines est limitée par le développement de la végétation herbacée. L'immobilisation microbienne de l'azote, favorisée par les apports de matière organique et l'augmentation de la température, est supposée être la cause de cette diminution de la minéralisation nette. En conséquence, le drainage d'azote minéral à 15 cm de profondeur est réduit après la coupe. Toutefois, les flux de Mg et Ca dans les solutions gravitaires à 60 cm de profondeur ne sont pas modifiés après la coupe. cycle de l'azote / coupe à blanc / Pseudotsuga menziesii / drainage / sol

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Nutrient processes at the stream‐lake interface for a channelized versus unmodified stream mouth

Niswonger

Naranjo

Smith

et al. 2017

Water Resources Research

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Inorganic forms of nitrogen and phosphorous impact freshwater lakes by stimulating primary production and affecting water quality and ecosystem health. Communities around the world are motivated to sustain and restore freshwater resources and are interested in processes controlling nutrient inputs. We studied the environment where streams flow into lakes, referred to as the stream‐lake interface (SLI), for a channelized and unmodified stream outlet. Channelization is done to protect infrastructure or recreational beach areas. We collected hydraulic and nutrient data for surface water and shallow groundwater in two SLIs to develop conceptual models that describe characteristics that are representative of these hydrologic features. Water, heat, and solute transport models were used to evaluate hydrologic conceptualizations and estimate mean residence times of water in the sediment. A nutrient mass balance model is developed to estimate net rates of adsorption and desorption, mineralization, and nitrification along subsurface flow paths. Results indicate that SLIs are dynamic sources of nutrients to lakes and that the common practice of channelizing the stream at the SLI decreases nutrient concentrations in pore water discharging along the lakeshore. This is in contrast to the unmodified SLI that forms a barrier beach that disconnects the stream from the lake and results in higher nutrient concentrations in pore water discharging to the lake. These results are significant because nutrient delivery through pore water seepage at the lakebed from the natural SLI contributes to nearshore algal communities and produces elevated concentrations of inorganic nutrients in the benthic zone where attached algae grow.

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Nitrogen Uptake and Release in a Forested Watershed, Lake Tahoe Basin, California

Cited by 59 publications

References 13 publications

Lake Tahoe watershed assessment: volume I

Lake Tahoe watershed assessment: volume I

Effects of a clear-cut on the in situ nitrogen mineralisation and the nitrogen cycle in a 67-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation

Nutrient processes at the stream‐lake interface for a channelized versus unmodified stream mouth

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