Nitrogen and phosphorus in sediments in China: A national-scale assessment and review

Concentration distributions of total nitrogen (TN) and total phosphorus (TP) in sediments of the main river basins in China. The bar graphs show the (red) TN concentrations (g/kg) and the (gold) TP concentrations (g/kg) in each basin. Note that: g/kg is the concentration unit of TN and TP.167