[Temporal and spatial variation of nitrogen and phosphorus and eutrophication assessment in downstream river network areas of North Canal River Watershed].

Based on the water quality survey for one year in the downstream river network areas of North Canal River Watershed, variation features of inorganic nitrogen (N) and phosphorus (P) were analyzed, and water eutrophication degree of river network areas was also assessed. The results showed that the average concentration of TN was 12.50 mg x L(-1) (NH4(+)-N, 67.