Table 4.

Changes in solute behavior with time for different periods based on cumulative NO₃ residuals

Species	Time period	log C = b* log Q + c			WRTDS results
		B	b p valuea	R2	Change in concentration (% per year)	Change in flux (% per year)
Ca	1989–2000	−0.03	ns	0.04	−0.4	−0.5
Mg		−0.04	ns	0.06	−0.5	−0.5
Na		0.04	ns	0.03	−0.9	0.6
K		0.02	ns	0.02	−0.6	−0.4
SO4		0.04	ns	0.02	−0.7	0.0
Cl		0.01	ns	0.001	−0.6	0.1
HCO3		−0.04	**	0.14	−0.9	−0.5
NO3		0.2	ns	0.07	1.7	−1.0
Ca	2001–2008	−0.06	ns	0.09	0.2	−0.6
Mg		−0.1	*	0.18	−0.1	−1.2
Na		0.02	ns	0.004	−1.0	−2.2
K		0.09	**	0.3	0.1	−0.2
SO4		0.02	ns	0.006	−0.2	−2.4
Cl		−0.04	ns	0.01	−0.4	−2.0
HCO3		−0.1	**	0.3	−0.1	0.0
NO3		0.02	ns	0.001	4.5	0.3
Ca	2009–2013	−0.07	ns	0.13	−1.0	−0.9
Mg		−0.1	*	0.19	−1.0	−1.1
Na		0.05	ns	0.03	−1.8	−1.4
K		−0.03	ns	0.04	−0.8	−0.7
SO4		−0.11	ns	0.08	−2.1	−1.7
Cl		0.05	ns	0.02	−1.7	−1.9
HCO3		−0.05	ns	0.11	0.0	0.2
NO3		−0.02	ns	0.001	4.8	2.4

***0.001, **0.01, *0.05

Chemostatic solute behavior (type IV)

Italicized values represent chemostatic solute behavior (Type IV)

^ap value ranges: ns > 0.5; 0