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Table 4

The PCA results in different season

Spring
Summer
Autumn
Winter
PC1PC2PC3PC4PC1PC2PC3PC1PC2PC3PC1PC2
Eigenvalue 3.66 1.86 1.24 1.04 4.06 1.71 1.15 3.35 1.95 1.65 3.68 2.73 
Contribution rate /% 40.61 20.67 13.74 11.51 45.07 19.04 12.73 37.24 21.70 18.37 40.87 30.38 
Cumulative contribution rate /% 40.61 61.28 75.02 86.54 45.07 64.11 76.84 37.24 58.93 77.30 40.87 71.25 
pH − 0.84 0.02 0.02 0.54 − 0.93 −0.15 0.06 − 0.90 0.16 −0.03 − 0.94 −0.18 
Organic matter 0.78 0.32 −0.26 0.18 0.74 0.03 −0.46 0.84 −0.23 0.06 0.75 0.40 
Conductivity 0.59 0.05 −0.04 0.34 0.77 0.35 −0.12 0.80 −0.22 −0.19 0.71 0.31 
0–4 μm −0.70 0.54 −0.30 −0.31 −0.09 0.46 0.75 0.04 0.61 0.62 −0.62 0.60 
4–64 μm 0.04 −0.71 0.67 −0.08 −0.58 0.68 −0.44 0.36 0.73 −0.53 0.48 −0.83 
64–800 μm 0.82 −0.13 −0.14 0.44 0.58 −0.79 0.19 −0.34 −0.91 0.22 −0.21 0.74 
Spring
Summer
Autumn
Winter
PC1PC2PC3PC4PC1PC2PC3PC1PC2PC3PC1PC2
Eigenvalue 3.66 1.86 1.24 1.04 4.06 1.71 1.15 3.35 1.95 1.65 3.68 2.73 
Contribution rate /% 40.61 20.67 13.74 11.51 45.07 19.04 12.73 37.24 21.70 18.37 40.87 30.38 
Cumulative contribution rate /% 40.61 61.28 75.02 86.54 45.07 64.11 76.84 37.24 58.93 77.30 40.87 71.25 
pH − 0.84 0.02 0.02 0.54 − 0.93 −0.15 0.06 − 0.90 0.16 −0.03 − 0.94 −0.18 
Organic matter 0.78 0.32 −0.26 0.18 0.74 0.03 −0.46 0.84 −0.23 0.06 0.75 0.40 
Conductivity 0.59 0.05 −0.04 0.34 0.77 0.35 −0.12 0.80 −0.22 −0.19 0.71 0.31 
0–4 μm −0.70 0.54 −0.30 −0.31 −0.09 0.46 0.75 0.04 0.61 0.62 −0.62 0.60 
4–64 μm 0.04 −0.71 0.67 −0.08 −0.58 0.68 −0.44 0.36 0.73 −0.53 0.48 −0.83 
64–800 μm 0.82 −0.13 −0.14 0.44 0.58 −0.79 0.19 −0.34 −0.91 0.22 −0.21 0.74 
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