Table 1. The p-values of the differences between environmental conditions corresponding to each nitrate~ mode (low-typical, low-high, typical-high) are calculated by the Bonferroni corrected two-sample t-test with unequal variances, where “n.s.” indicates a non-significant result.

Variable	Low-typical	Low-high	Typical-high
GW3~	n.s.	5.7e-10	2.9e-10
GW32~	1.9e-137	2.8e-57	n.s.
Wt13~	n.s.	3.4e-09	n.s.
Sol71~	5.1e-111	2.5e-81	n.s.
Con47~	1.3e-205	6e-198	n.s.
Smoist24~	3.5e-220	1.2e-125	1.5e-15
q13~	n.s.	2.3e-31	3.2e-59
q18~	n.s.	9.6e-40	6.9e-69
rain~	n.s.	n.s.	n.s.

Only the variables with significant p-values and visual agreement using the class-wise Pareto Density Estimation are presented. Groundwater depth on the hillslope (GW25~) and water temperature at the upper gauge (Wt18~) are thus not presented.