Table 3.

Regression Coefficient Estimates of the Ordinary and Spatial Regression Models.

Parameters	Ordinary Stepwise Regression	Spatial Regression
		Straight-line Distance	River Distance
Intercept	−7.103	−0.837	−3.118
Percentage of cropland	0.013	0.019	0.019
Percentage of hydrological soil group C	−0.018	−0.020	−0.023
Ln of distance-weighted TN load from point sources	0.237	0.287	0.262
Ln of rural population density	0.956	0.132	0.454
θ 1		0.0	0.08
θ 2 (km)		205	250