Table 2.

GLM analysis of the relationships between lake nutrient concentrations and ratios and corresponding explanatory variables (n = 46)

Variables	TN concentration		TP concentration		TN/TP mass ratio
	SE × 10−3	RI, %	SE × 10−3	RI, %	SE	RI, %
Municipal wastewater	2.1	47.7	1.5	13.3	2.2	39.0
Rural wastewater	0.4	7.6	0.2	23.3	2.4	15.4
Crop farming	0.2	7.6	0.3	13.5	2.5	2.5
Livestock farming	0.5	26.3	0.3	35.4	6.7	14.2
Aquaculture	5.2	5.0	1.2	5.3	6.9	9.6
Precipitation	0.2	2.2	0.0	1.8	1.64	4.9
Temperature	20.1	3.4	1.0	7.2	0.0	14.3

RI, relative importance explained by the variable.