Nutrient dynamics in rhithron zone of Shivalik Himalayan stream Sahastradhara, Dehradun (Uttaranchal)

Sahastradhara hill-stream is a major tributary of river Song, 15 Km. far from Dehradun. It has a great importance as a picnic  tourist  spot of  the region,  whereas there  is no more  industrial and agricultural pollution. Hill streams of the area are the cradle of nutrients especially calcium and magnesium in the form of ions. Anthropogenic factors mainly tourists activities and catchments runoff may influence  the index  of nutrients  in stream water. Nutrients play a vital role into niche restoration maintenance, self-regulation and water quality. Location variation in nutrients  concentration  of  the  stream  was  studied  with  special  reference  to  correlation with physico-chemical  parameters  of the stream  water.  Calcium  and Magnesium  were observed  in higher  range in  Sahastradhara stream  in comparison  to other  hill-streams. Calcium  and  Magnesium  were  found  maximum 104.21 mg/l and 68 mg/l respectively in summer season. &nbsp