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Table 1 Linear mixed-effects model analysis: the effects of topographic location and seasons on soil moisture, DOC, DON, NH4 +, NO3 concentrations, net N mineralisation, and net N nitrification in O/A horizon

From: Great fraction of dissolved organic C and N in the primary per-humid Chamaecyparis forest soil

Effects Soil moisture (g g−1) DOC (mg C kg−1) DON (mg N kg−1) NH4 + (mg N kg−1) NO3 (mg N kg−1) Net N mineralisation (mg N kg−1 wk−1) Net N nitrification (mg N kg−1 wk−1)
Coeff. SE Coeff. SE Coeff. SE Coeff. SE Coeff. SE Coeff. SE Coeff. SE
Location
 Summita 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 Footslope 0.02* 0.01 NS 35.70* 16.78 NS NS NS NS
 Lakeshore NS NS NS NS NS NS NS
Season
 Springa 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 Summer −0.03** 0.01 NS NS −24.20*** 6.69 −3.62*** 0.64 NS NS
 Autumn NS NS −42.58* 17.11 NS −1.65* 0.65 NS NS
 Winter NS NS 38.04* 16.07 NS −2.60*** 0.61 45.83* 20.45 NS
Interaction
 Footslope × Summer NS NS NS 24.63** 9.46 2.50** 0.91 NS NS
 Lakeshore × Summer NS NS NS NS NS NS NS
 Footslope × Autumn NS NS NS 31.67*** 9.34 2.02* 0.90 NS NS
 Lakeshore × Autumn NS NS NS NS NS NS NS
 Footslope × Winter NS NS NS NS NS NS NS
 Lakeshore × Winter NS NS −60.05** 22.86 NS NS NS NS
  1. Coeff. and SE are the estimated coefficient and standard error of each independent variable in the model
  2. The + or − before the value of Coeff. indicates the higher or lower value than ‘Summit’ in location or ‘Spring’ in season
  3. *** p < 0.001, ** p < 0.01, * p < 0.05, NS not significant (p >  0.1)
  4. aSet to zero due to being the standard for comparison within each categorical factor