Variable (unit)

Species

Method

Treatment: added CO₂ (df = 1)

Treatment: added N (df = 1)

AIR

CO₂

%CO₂

F-value

P-value

Bias

N₀

N⁺

%N⁺

F-value

P-value

Bias

HG^a (mm)

Polytrichum

Cut

13.6

10.0

−27%

3.6

0.07

No

18.5

10.4

−44%

4.2

0.05

Yes

Uncut

46.3

31.3

−32%

13.2

0.001

25.7

31.4

22%

2.2

n.s.

∆Cut-uncut (%)

−71%

−68%

−28%

−67%

Sphagnum

Cut

8.4

4.8

−43%

6.0

0.02

No

16.5

6.1

−63%

5.2

0.03

Yes

Uncut

35.1

26.9

−23%

4.5

0.04

22.2

24.7

11%

1.1

n.s.

∆Cut-uncut (%)

−76%

−82%

−26%

−75%

∆HG^a (mm)

Polytr.-Sphagnum

Cut

5.0

5.2

3%

1.5

n.s.

Yes

2.0

3.8

88%

8.9

0.006

No

Uncut

8.8

4.5

−49%

5.1

0.03

3.4

6.7

94%

4.2

0.05

LG (mm)

Polytrichum

Cut

13.3

12.0

−10%

3.1

n.s.

Yes

17.6

11.1

−37%

27.5

<0.001

Yes

Uncut

54.6

37.4

−32%

13.6

0.005

27.8

34.1

23%

3.1

n.s.

∆Cut-uncut (%)

−76%

−68%

−37%

−67%

Sphagnum

Cut

14.6

12.4

−15%

3.2

n.s.

No

Plants too fragile to handle

n.d.

Uncut

37.8

32.1

−15%

3.1

n.s.

24.0

26.9

12%

0.7

n.s.

∆Cut-uncut (%)

−62%

−61%

n.a.

n.a.

∆LG (mm)

Polytr.-Sphagnum

Cut

1.5

0.8

−45%

2.8

n.s.

Yes

Plants too fragile to handle

n.d.

Uncut

10.2

5.3

−48%

3.9

0.08

3.9

7.3

89%

3.0

n.s.

MG (mg)

Polytrichum

Cut

5.5

5.2

−5%

3.8

n.s.

Yes

6.8

2.8

−58%

1.6

n.s.

No

Uncut

11.4

8.4

−27%

18.5

0.002

6.3

5.9

−5%

0.6

n.s.

∆Cut-uncut (%)

−52%

−38%

8%

−53%

Sphagnum

Cut

6.7

8.2

22%

2.3

n.s.

No

Plants too fragile to handle

n.d.

Uncut

6.4

6.0

−7%

1.8

n.s.

4.2

5.1

21%

2.4

n.s.

∆Cut-uncut (%)

4%

36%

n.a.

n.a.

∆MG (mg)

Polytr.-Sphagnum

Cut

−0.6

−2.7

338%

1.7

n.s.

No

Plants too fragile to handle

n.d.

Uncut

4.2

2.4

−44%

2.7

n.s.

2.1

1.5

−25%

3.1

n.s.