Development of organic matter, phosphorus and nitrate in EU 15 rivers
The graphic shows the development of organic matter, phosphorus and nitrate in EU 15 rivers. Water resources in Europe have been profoundly influenced over the past century by human activities, including the construction of dams and canals, large irrigation and drainage systems, changes of land cover in most watersheds, high inputs of chemicals from industry and agriculture into surface and groundwater, and depletion of aquifers. Some of the most...
14 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Yearly applied phosphorus by mineral fertilizers
Graphics from the year 2000 Baltic 21 biannual indicator-based status report on sustainable development in the Baltic Sea Region (Baltic 21 Series No 1/2000). The graphic shows a decline in yearly applied Phosphorus by mineral fertilizers.
10 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Trends in Phosphorus loads and concentrations, Baltic Sea, 1900-2030
The graphic shows trends in Phosphorus loads and concentrations in the Baltic Sea from 1900 to 1995 with projections to 2030. Phosphorus is an agricultural fertilizer. Phosphorus is produced in nature, but never in its pure form. As an agricultural fertilizer or from sewage released into water, it can cause excessive algae growth.
13 Feb 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Dissolved phosphate levels: concentrations at river mouths
Phosphorus is naturally present in water, primarily as inorganic and organic phosphates. Phosphates can enter aquatic environments in several ways: from the natural weathering of minerals in the drainage basin, from biological decomposition, or as runoff from human activity in urban and agricultural areas.
A comparison of the major watersheds between the two decades showed that northern Europe and North America had lower phosphate concentrations...
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
Nitrate levels: concentrations at river mouths
Nutrients are essential to life. In aquatic systems, nitrogen and phosphorus are the two nutrients that most commonly control the growth of aquatic plants, algae and bacteria. Nitrogen and phosphorus are considered to be the primary drivers of eutrophication of aquatic ecosystems, where increased nutrient concentrations lead to increased primary productivity. Some systems are naturally eutrophic, whereas others have become eutrophic as a result o...
26 Jan 2009 - by Philippe Rekacewicz