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 l1
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.