Evaluation of the Impacts of Land Use on Water Quality: A Case Study in The Chaohu Lake Basin

Table 4

The correlation coefficients between different land uses and water quality variables at the scale of the whole watershed.

Variables (%)	ln (TN)	ln (TP)	ln (CODmn)	ln (NH3–N)	ln (DO)
	coef.	coef.	coef.	coef.	coef.
Cultivated land	−0.46	−0.42	−0.08	0.31	0.06
Forest land	−4.11**	−9.59***	−5.47***	−9.26***	0.31
Grassland	−6.52***	−7.87***	−2.93***	−8.83***	0.54
Water area	−0.30	0.26	0.29*	1.22**	0.0029
Built-up area	0.86	1.54**	0.70**	2.60***	−0.27*
Constant	1.20***	−1.44***	1.69***	−1.04***	2.08***
𝑅-squared	0.49	0.75	0.80	0.69	0.36

^∗∗∗𝑃<0.01, **𝑃<0.05, *𝑃<0.1.