Predicting particulate pools of nitrogen, phosphorus and organic carbon in lakes

2007 ◽  
Vol 69 (4) ◽  
pp. 484-494 ◽  
Author(s):  
Andreas C. Bryhn ◽  
Dag O. Hessen ◽  
Thorsten Blenckner
Keyword(s):  
Organic Carbon ◽  
Nitrogen Phosphorus

Nitrogen, Phosphorus and Organic Carbon Pools in Natural and Transplanted Marsh Soils

Estuaries ◽  
1988 ◽  
Vol 11 (4) ◽  
pp. 272 ◽  
Author(s):  
C. B. Craft ◽  
S. W. Broome ◽  
E. D. Seneca
Keyword(s):  
Organic Carbon ◽  
Carbon Pools ◽  
Nitrogen Phosphorus

Digital soil mapping of nitrogen, phosphorus, potassium, organic carbon and their crop response thresholds in smallholder managed escarpments of Malawi

2020 ◽  
Vol 124 ◽  
pp. 102299
Author(s):  
Powell Mponela ◽  
Sieglinde Snapp ◽  
Grace B. Villamor ◽  
Lulseged Tamene ◽  
Quang Bao Le ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Mapping ◽  
Digital Soil Mapping ◽  
Crop Response ◽  
Response Thresholds ◽  
Nitrogen Phosphorus

Dissolved nutrients and organic particulates in water flowing over coral reefs at Lizard Island

1983 ◽  
Vol 34 (6) ◽  
pp. 835 ◽  
Author(s):  
CJ Crossland ◽  
DJ Barnes
Keyword(s):  
Organic Carbon ◽  
Coral Reefs ◽  
Organic Nitrogen ◽  
Inorganic Nitrogen ◽  
Dissolved Nutrients ◽  
Reef Complex ◽  
Nutrient Levels ◽  
Lizard Island ◽  
Nitrogen Phosphorus ◽  
Benthic Zone

Concentrations of dissolved nutrients and organic particulates were measured in seawater flowing across the windward and leeward reef flats of the lagoonal reef complex at Lizard Island. Measurements were made during the day, at night, and at various stages of the tide over a period of several weeks. The reef complex, as a whole, did not consume or export statistically significant amounts of inorganic nitrogen, phosphorus, silicate, organic nitrogen or organic carbon. Depletion or elevation of nutrient levels in one benthic zone appeared to be balanced by production or consumption in downstream zones.

Nitrogen, Phosphorus, and Organic Carbon Cycling in an Arctic Lake

1985 ◽  
Vol 42 (4) ◽  
pp. 797-808 ◽  
Author(s):  
S. C. Whalen ◽  
J. C. Cornwell
Keyword(s):  
Organic Carbon ◽  
Primary Production ◽  
Water Column ◽  
Cold Water ◽  
Nutrient Retention ◽  
Overlying Water ◽  
Organic C ◽  
Outlet Stream ◽  
Organic Carbon Cycling ◽  
Nitrogen Phosphorus

Budgets for nitrogen, phosphorus, and organic carbon in Toolik Lake, Alaska, were assembled from data collected during 1977–81. The annual total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) loads to the Sake were 8557, 290, and 4.64 mmol∙m−2. Inlet streams were the major source of nutrients to the lake, as direct precipitation provided only 1, 2, and 5%, respectively, of the annual TOC, TN, and TP loads to the lake. Up to 30% of the annual N and P inputs to the lake from riverine sources occurred during the first 10 d of stream flow following breakup when cold water temperatures and snow-covered ice limited primary production. Due to the short water renewal time (0.5 yr), efficiency of nutrient retention was poor and 90, 82, and 70% of the annual TOC, TN, and TP inputs to the lake were discharged at the outlet stream. Regeneration within the water column supplied 40–66% and 68–78% of the N and P necessary for measured primary production. Yearly accumulation rates for C, N, and P in the sediment were about 220, 21.0, and 1.75 mmol∙m−2. Phosphorus remineralized within the sediment was completely retained due to adsorption onto Fe oxide minerals in the oxidizing surface layer. Annual rates of release of C and N to the overlying water column were 110 and 11.5–22.2 mmol∙m2. Mass balance considerations showed no serious errors in estimates of any terms of the annual sediment and water column N, P, and organic C budgets.

scholarly journals Nitrogen, Phosphorus and Organic Carbon in Main Rivers of the Western Greece

2013 ◽  
Vol 5 (3) ◽  
pp. 147-156
Keyword(s):  
Organic Carbon ◽  
Catchment Area ◽  
Nitrogen Compounds ◽  
Chemical Parameters ◽  
Small Stream ◽  
Polluted River ◽  
Temporal And Spatial ◽  
Nitrogen Phosphorus ◽  
Western Greece

Results of a monitoring project for the water quality of three important rivers of western Greece (Acheloos, Louros and Acherontas) are presented in this paper. The results include the concentrations as well as the temporal and spatial distributions of nitrates, nitrites, phosphates, ammonia and dissolved organic carbon for a period of twelve months (October 2002 to September 2003). Monthly samplings took place in four sampling sites at the rivers Acheloos and Louros and two at the river Acherontas. The samples were analyzed by standard spectrophometrical methods. According to our measurements, Louros is the most polluted river as it concerns nitrogen compounds, probably due to the increased human activities in its catchment area. It also occasionally accepts pollutants from the small stream of Vossa. Although Acheloos is the biggest and most important river for the whole territory, it seems not to be heavily polluted. The chemical parameters level, indicates the enrichment of its water in nutrients, from the water of Lisimahia lake that enters the river through the water lock of Dimikos. No significant inflow of pollutants was observed in river Acherontas, since no remarkable spatial variation recorded.

scholarly journals ASPECTOS GEOQUÍMICOS Y AMBIENTALES DE LOS SEDIMENTOS DEL RÍO CUCHIVERO, VENEZUELA.

2016 ◽  
Author(s):  
Arístide Márquez ◽  
Gregorio Martínez ◽  
Julio Figuera ◽  
Ivis Fermín ◽  
William James Senior ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Organic Carbon ◽  
Total Phosphorus ◽  
River Sediments ◽  
Point Of View ◽  
Poor Correlation ◽  
The Poor ◽  
Del Rio ◽  
Nitrogen Phosphorus

This paper reports the geochemical characteristics and environmental conditions of Cuchivero river sediments in Venezuela, depending on particle size, organic matter, organic carbon, nitrogen and total phosphorus, carbonates and heavy metals. The granulometry was typified by a predominance of sands with low organic matter (0.52 to 0.87%), organic carbon (0.06 to 0.09%) and carbonates content (0.54 to 2.61%) as well as high values of total nitrogen (602-985 mg / kg). The poor correlation between nitrogen, phosphorus and organic matter, suggests presence of nitrogen and total phosphorus of allochthonous origin and no Redfield organic matter. The average heavy metals in mg/kg, showed a descending concentration gradient, Fe (410)> Mn (63.14)> Zn (9.01)> Ni (3.38)> (2.21Cu)> Cr (2.09)> Co (1.13)> Cd (0.21) > Pb (0.07) mg / kg, with an association to the sands and carbonates, suggesting lithogenic origin. From the environmental point of view, there is no evidence of anthropogenic impact, as reflected by levels of organic matter and heavy metals which are below of the permissible values.

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