Fig. 1. Distribution map of sampling points

Fig. 2. Water quality evaluation and eutrophication type evaluation in water

Fig. 3. N (a) and P (b) fractions concentrations in each sampling sites in water

Fig. 4. N and P pullution evaluation of sediment with reference to evaluation standard and composite pollution index
(a): N and P pullution evaluation of sediment with reference to evaluation; (b): N and P pullution evelution of composite pollution index

Fig. 5. N (a) and P (b) fractions concentrations in each sampling sites in sediment

Fig. 6. N, P pollution of Spatial distribution map based on PCA scores

Fig. 7. The contribution of different sources to various nitrogen and phosphorus fractions according to the APCS-MLR receptor model