DYNAMICS OF NITROGEN (N) AND PHOSPHORUS (P) DISCHARGE BY THE RIVER SHKUMBINI OVER DIFFERENT PERIODS

The purpose of this paper is to evaluate these nutrients transport from the river Shkumbini based on the perennial database.These data are used to study the dynamics of the yearly distribution according to seasons in the region of our study.The calculations performed in this study show that Shkumbini river discharges into the Sea approximately 7.19 t nitrogen and 0.642 t phosphorus each year.Coefficient of these nutrients discharge varies on average 25-32 kg N ha-1 yr-1, and 1.8-2.8 kg P ha-1 yr-1. By using these perennial data and our experimental measurements in the field for many years it is noted that the values of phosphorus discharge are mainly in summer when the flow are low, while its very low concentration are observed during winter and spring.There is also repeated the same legitimacy in the case of nitrogen notes in the river Shkumbini.The change of nutrients’ concentration reflects fully the different sources of discharge in Shkumbini river such as: industrial, urban, agricultural etc.So the contents of nitrogen and phosphorus in Shkumbini river are lower in the upstream of the river, while in its downstream is higher.Also referring to the estuary study data of Shkumbini river it noted that indicators of nitrogen and phosphorus content transported were higher than the two above references.