Characterizing and explaining spatio-temporal variation of water quality in a highly disturbed river by multi-statistical techniques

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Table 4 Pearson correlation coefficient (r) between land use categories and water quality parameters

Scale	Water quality	r ₁ (between land use and pollutant concentration)				r ₂ (between land use and Cv of pollutant concentration)
Scale	Water quality	Urban land	Farmland	Forest	Water	Urban land	Farmland	Forest	Water
Sub-catchment	COD	0.89**	0.50*	−0.63**	−0.51*	−0.45	−0.60*	0.64**	0.44
	NH₃-N	0.77**	0.52*	−0.65**	−0.26	−0.36	0.10	−0.02	−0.01
100 m buffer	COD	0.67**	0.58*	−0.53*	−0.67**	−0.37	−0.49	0.56*	0.47
	NH₃-N	0.17	0.50*	−0.51*	−0.48	−0.14	0.009	0.01	0.14