Based on the amount of phytoplankton growth and the concentration of nutrients, the degree of eutrophication in aquatic environments can be classified as:
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Background comments on lake pollution The demand for surface water for many purposes is increasing globally, mainly due to population growth and irrigation, particularly in arid and semi-arid regions. Eutrophication often becomes apparent to the public as populations increase in density. The total impact of humans on nature is probably about eight times higher today than 40-50 years ago, given the growth in population, in industrial and agricultural production, and in technological development (we use more chemicals, traffic density has increased, etc.).
Growth results from the process of photosynthesis which is how the plants generate organic compounds and biomass through the uptake of nutrients (nitrogen, phosphorus and others) from the soil and water. In the process light acts as the energy source and carbon dioxide dissolved in water as the carbon source. As a result of the photosynthetic process oxygen is also produced. Eutrophication is one of the most widespread environmental problems of inland waters, and is their unnatural enrichment with two plant nutrients, phosphorus and nitrogen.
One important result of lake and reservoir enrichment is increased growth of microscopic floating plants, algae, and the formation of dense mats of larger floating plants such as water hyacinths (Photos 1 and 2) and Nile cabbage. |
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