Table 2 Descriptive statistics for measured parameters showing an F value above 1.5 when compared in a simple regression analysis with mean \( {\text{N}}{{\text{O}}_3}{^{ - }_{\text{seepage}}} \) and their correlation coefficient with mean \( {\text{N}}{{\text{O}}_3}{^{ - }_{\text{seepage}}} \)

Mean NO₃ ⁻ in seepage water

NO ⁻₃

mg l⁻¹

71

N-turnover

Net N mineralization^b

mg N kg⁻¹ day⁻¹

51

inorg N pool (NH ⁺₄  + NO ⁻₃ )^b

mg N kg⁻¹

43

Net nitrification^b

mg N kg⁻¹ day⁻¹

54

NH ⁺₄ pool^b

mg N kg⁻¹

94

NO ⁻₃ pool^b

mg N kg⁻¹

40

Vegetation coverage

Oxalis acetosella

%

64

Mosses

%

41

Other vascular plants

%

186

Roots biomass

Roots <2 mm (1–3)

g m⁻² layer⁻¹

33

Roots 2–5 mm (2)

g m⁻² layer⁻¹

61

Roots <2 mm (4)

g m⁻² layer⁻¹

78

Roots <2 mm (1)

g m⁻² layer⁻¹

36

Roots <2 mm (2)

g m⁻² layer⁻¹

53

Roots 2–5 mm (1)

g m⁻² layer⁻¹

30

Roots 2–5 mm (3)

g m⁻² layer⁻¹

116

Chemical soil parameters

pH in H₂O (4)

2

pH in H₂O (3)

3

C/N (4)

ratio

17

C content (4)

%

18

C content (3)

%

20

C/N (3)

ratio

16

N content (1)

%

19

C content (0)

%

7

C content (1)

%

24

C/N (0)

ratio

4

Stand parameter

Basal area within a radius of 4 m

cm²

26

Basal area within a radius of 2.2–4 m

cm²

58

Physical soil parameters

Macropores (>50 μm) (3)

vol.%

32

Meso- and fine pores (<10 μm) (3)

vol.%

5

Bulk density (3)

g cm⁻³

5

Organic layer depth

Depth O_h

mm

20

Depth O_h + O_f

mm

20