Table 5. Mean annual NO3–-N, NH4+-N and total N concentrations in the soil solution in the sites where above-ground biomass was harvested in a study on logging effects on soil N in Latvia.
Year	Hylocomiosa (Vilkukalns)			Oxalidosa turf. mel. (Kudrenis)			Myrtillosa (Zveri)
	SOH	WTH	C	SOH	WTH	C	SOH	WTH	C
NO3–-N concentration in soil solution ± standard error, mg l–1
2013	1.66* ± 0.38	1.51 ± 0.47	0.38 ± 0.14	1.41** ± 0.34	7.62* ± 1.24	0.84 ± 0.18	2.98* ± 0.47	1.99* ± 0.33	0.13 ± 0.02
2014	5.49* ± 0.61	6.46* ± 0.61	0.11 ± 0.04	0.96** ± 0.31	10.72* ± 1.59	0.80 ± 0.19	5.82*/** ± 0.61	1.10* ± 0.26	0.10 ± 0.03
2015	6.18*/** ± 0.57	8.74* ± 0.59	0.01 ± 0.01	0.96** ± 0.27	6.43* ± 1.15	0.98 ± 0.33	5.25*/** ± 0.56	0.56* ± 0.18	0.02 ± 0.01
2016	2.31*/** ± 0.34	5.52* ± 0.73	0.01 ± 0.01	0.89*/** ± 0.29	1.99 ± 0.48	1.91 ± 0.46	4.75*/** ± 0.71	0.13* ± 0.05	0.02 ± 0.01
2017	0.66*/** ± 0.27	2.02* ± 0.41	0.02 ± 0.01	0.99*/** ± 0.35	0.63 ± 0.17	1.38 ± 0.26	1.96*/** ± 0.42	0.59 ± 0.56	0.05 ± 0.02
2018	1.03* ± 0.45	2.52* ± 1.35	0.01 ± 0.01	1.70 ± 0.46	3.42 ± 1.60	2.08 ± 0.60	2.73* ± 1.41	0.02 ± 0.02	0.03 ± 0.01
NH4+-N concentration in soil solutio ± standard error, mg l–1
2013	0.23 ± 0.10	0.08 ± 0.03	0.11 ± 0.07	0.03** ± 0.01	0.15* ± 0.04	0.02 ± 0.01	0.02 ± 0.01	0.02 ± 0.01	0.02 ± 0.01
2014	0.39* ± 0.11	0.43* ± 0.18	0.65 ± 0.58	0.02** ± 0.01	0.31* ± 0.08	0.02 ± 0.01	0.23*/** ± 0.07	0.02 ± 0.01	0.03 ± 0.01
2015	0.13** ± 0.07	0.18 ± 0.06	0.19 ± 0.15	0.02*/** ± 0.01	0.15* ± 0.05	0.02 ± 0.01	0.03*/** ± 0.01	0.01 ± 0.01	0.02 ± 0.01
2016	0.04 ± 0.02	0.10 ± 0.05	0.03 ± 0.02	0.01** ± 0.01	0.13* ± 0.05	0.01 ± 0.01	0.01 ± 0.01	0.01 ± 0.01	0.01 ± 0.01
2017	0.03 ± 0.01	0.06 ± 0.02	0.01 ± 0.01	0.01** ± 0.05	0.13* ± 0.07	0.01 ± 0.01	0.02 ± 0.01	0.02 ± 0.01	0.03 ± 0.01
2018	0.01 ± 0.01	0.02 ± 0.01	0.01 ± 0.01	0.05* ± 0.03	0.04 ± 0.03	0.05 ± 0.02	0.01 ± 0.01	0.01 ± 0.01	0.02 ± 0.01
TN concentration in soil solution ± standard error, mg l–1
2013	3.17* ± 0.53	2.17 ± 0.45	1.03 ± 0.30	2.87** ± 0.41	12.27* ± 2.23	2.42 ± 0.29	3.73* ± 0.52	2.35* ± 0.34	0.38 ± 0.04
2014	9.36* ± 1.12	11.09 ± 1.64	1.43 ± 0.67	2.57** ± 0.46	15.16* ± 1.62	2.56 ± 0.27	7.84*/** ± 0.73	1.74* ± 0.33	0.89 ± 0.50
2015	6.54*/** ± 0.60	9.24* ± 0.61	1.06 ± 0.39	1.98** ± 0.29	7.89* ± 1.01	2.02 ± 0.33	5.69*/** ± 0.56	0.78* ± 0.16	0.30 ± 0.04
2016	2.82*/** ± 0.32	6.29* ± 0.74	0.86 ± 0.15	2.02*/** ± 0.32	3.28 ± 0.54	3.01 ± 0.47	5.16*/** ± 0.75	0.41 ± 0.05	0.31 ± 0.03
2017	1.24** ± 0.46	2.28* ± 0.39	0.74 ± 0.18	1.89* ± 0.35	2.07 ± 0.35	2.39 ± 0.24	2.08*/** ± 0.41	0.88 ± 0.59	0.30 ± 0.05
2018	1.83 ± 0.41	3.58 ± 1.61	0.82 ± 0.27	2.80* ± 0.52	5.21 ± 1.51	3.69 ± 0.61	3.21 ± 1.51	0.69 ± 0.18	1.77 ± 0.01
* - Statistically significant difference between treated (SOH or WTH) and control (C) subplots within year by the Wilcoxon rank sum test. ** - Statistically significant difference between SOH and WTH subplots within year by the Wilcoxon rank sum test. SOH - stem-only harvesting with slash and stumps remaining at the site; WTH - whole‐tree harvesting with slash removed; C - unharvested control. 2013 represents the          first year after harvesting.