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Higher nutrients concentrations were observed into the surface microlayer then in the subsurface of estuarine, shallow lake water. The thinner the surface microlayer, which means the closer it is to the water-atmosphere contact zone, the higher are concentrations of organic and inorganic phosphorus, as well as organic and ammonia nitrogen. Mean values of enrichment coefficients were usually positive...
In a mosaic landscape moderately affected by agriculture and tourism, such as found in the Masurian Lakeland (north-eastern Poland) external input of nutrients (TP, TN, NNO3) and their retention were compared in a cascade of shallow in-river lakes, between several years of different weather conditions. The average and maximum air temperature in the summer and winter months and that of the freshet...
Lowland rivers in industrial countries such as the UK are seriously impacted by phosphorus from a variety of sources. Point sources include numerous sewage-treatment works; diffuse sources include a full range of agricultural activities from fertiliser application to intensive poultry and stock rearing. The scientific consensus is that the concentration of phosphorus is an important measure of eutrophication...
Seasonal changes of water level, aquatic chemistry and phytoplankton composition of the Daugava’s floodplain lake Grīvas was studied in 1999. Significant influence of the Daugava’s floods on the lake’s water level was found. Filling, drainage and isolation phases in hydrological regime of the lake were distinguished. The Daugava’s floodwater influx in April caused considerable water level rising and...
Waco Lake (Texas, U.S.A.) is a municipal water supply fed by largely agricultural watersheds and is characterized by poor water quality because of elevated nutrient concentrations. Watershed modeling is used to prioritize management options to reduce nutrient loading into the reservoir. A natural (pre-agricultural) system scenario of the dominant watershed resulted in 80% reduction of total phosphorus...
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