Apport et distribution des nutriments dans le bassin versant Seybouse à la mer

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Université Abbes Laghrour -Khenchela-
Seybouse river drains one of the main watershed basins of the country (6500 km ) with a strong climatic hydrographic network. On this basin exerted significant anthropogenic activities from the number of inhabitant (2 million inhabitants) that grow quickly. In order to cover the drainage basin of Seybouse, six stations were sampled during our study of the winter period. For a better understanding of the chemical conditions reigning the basin, the stations are positioned according to strategic points: upstream and downstream of dams in the confines of the basin, the ultimate crossroads mouth of by-products of anthropogenic activities. What we retained from this study is the important capture of Silicon at the level of dams which will necessarily impact the coastline receiving. It should also be noted the dominance of the organic fraction of phosphorus (POD) compared to that of nitrogen which form as 17% of dissolved nitrogen. Paradoxically, in terms of nitrogen and phosphorus dissolved with a ratio of 8 deviates widely to the Redfieled report. However as Silicon is a reduction in the mouth with a report full of Si/N = 1.