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Researchers have concluded that the physicochemical properties of sediments significantly influence Qm, NAP, and EPC0 values. Table 3 shows the inter-correlations among Qm, NAP, EPC0, particle size, and OM content of sediments in 2011 and 2013. In these two years, the proportions of fine particles (<63 μm) in the sediment had highly significant relationships (R2 > 0.92, phosphorus < 0.01) with Qm. The relationship between OM content in sediments and Qm was also significant (R2 > 0.89, P < 0.05). EPC0 and NAP had significant relationships with Qm in 2011 and 2013. This relationship demonstrates that the proportion of fine particles (<63 μm) and OM content in sediments plays major roles in phosphorus sorption.

Table 3

Pearson correlation coefficients among theoretical sorption maxima (Qm), NAP, EPC0, proportion of fine particles (<63 μm), and OM in 2011 and 2013 (five composite surface sediment samples were used, each sample n = 5)

 Particle sizeOMQmEPC0NAP
2011 
 Particle size     
 OM 0.821    
Qm 0.923** 0.962*   
EPC0 0.821* 0.792 0.819*  
NAP 0.872 0.871 0.913* 0.847 
2013 
 Particle size     
 OM 0.721    
Qm 0.935** 0.897*   
EPC0 0.791 0.916 0.769*  
NAP 0.827 0.851 0.862* 0.671 
 Particle sizeOMQmEPC0NAP
2011 
 Particle size     
 OM 0.821    
Qm 0.923** 0.962*   
EPC0 0.821* 0.792 0.819*  
NAP 0.872 0.871 0.913* 0.847 
2013 
 Particle size     
 OM 0.721    
Qm 0.935** 0.897*   
EPC0 0.791 0.916 0.769*  
NAP 0.827 0.851 0.862* 0.671 

*P < 0.05.

**P < 0.01.

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