Spatiotemporal Variation Characteristics of Water Pollution and the Cause of Pollution Formation in a Heavily Polluted River in the Upper Hai River

Table 5

Rotated component matrix and contributions of pollutant sources in the nonflood season.

Parameters	Variance factors (VFs)			Contribution percentage (%)			R^2
	VF1	VF2	VF3	VF1	VF2	VF3
pH	−0.148	−0.924	−0.252	11.16	69.81	19.03	0.94
DO	−0.763	−0.575	−0.097	57.05	42.95	—	0.91
CODCr	0.882	0.342	0.227	60.78	23.55	15.66	0.95
BOD5	0.921	0.096	0.330	73.59	—	26.41	0.96
NH3–N	0.377	0.789	0.236	26.89	56.26	16.85	0.82
TP	0.529	0.508	0.540	33.52	32.24	34.24	0.83
F^−	0.253	0.265	0.914	17.66	18.49	63.85	0.97
Variance (%)	38.79	32.28	20.24	—	—	—	—
Cumulative (%)	38.79	71.07	91.31	—	—	—	—