Fig. 4: The relationship among physicochemical properties, SPM size and P concentration in different seasons in the Yellow River.

(a) Rainy season; (b) Dry season. The color transition from red to blue represents the degree of correlation from positive to negative correlation. “D50” means median particle size; “D90” represents that the cumulative mass of particles smaller than a certain size accounts for 90% of all particles; SPM suspended particulate matter, TP total phosphorus, TDP total dissolved phosphorus, DRP dissolved reactive phosphorus, DO dissolved oxygen, EC electrical conductivity, SAL salinity, ORP oxidation reduction potential.