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Table 3 Paired t-test comparisons of height and diameter of trees with and without canopy retention, and height and diameter of trees with and without regenerated canopy, following three wildfires in the Santa Cruz Mountains, California, USA.

From: Survival and Recovery Following Wildfire in the Southern Range of the Coast Redwood Forest

Species

Mean height with canopy retention ± SE (m)

Mean height without canopy retention ± SE (m)

t-statistic

P-value

Coast redwood

33.3 ± 1.3

9.1 ± 0.8

15.658

<0.001

Tanoak

21.3 ± 1.4

6.0 ± 0.6

9.951

<0.001

Douglas-fir

26.1 ± 5.2

16.7 ± 3.6

1.470

0.158

Pacific madrone

11.9 ± 1.1

7.6 ± 1.2

2.657

0.027

Oak

17.8 ± 3.0

3.9 ± 0.6

4.524

0.017

Species

Mean dbh with canopy retention ± SE (cm)

Mean dbh without canopy retention ± SE (cm)

t -statistic

P -value

Coast redwood

66.5 ± 3.1

16.8 ± 1.6

14.235

<0.001

Tanoak

42.7 ± 3.3

10.9 ± 1.3

8.989

<0.001

Douglas-fir

50.3 ± 12.0

46.1 ± 8.5

0.267

0.791

Pacific madrone

26.8 ± 5.6

21.3 ± 3.4

0.491

0.627

Oak

52.0 ± 15.2

12.7 ± 1.7

4.848

<0.001

Species

Mean height with regenerated canopy ± SE (m)

Mean height without regenerated canopy ± SE (m)

t -statistic

P -value

Coast redwood

30.6 ± 1.3

6.7 ± 0.6

17.035

<0.001

Tanoak

15.9 ± 1.4

6.0 ± 0.7

6.188

<0.001

Douglas-fir

24.3 ± 5.4

17.8 ± 3.6

0.982

0.340

Pacific madrone

8.8 ± 2.0

8.1 ± 1.3

0.299

0.772

Oak

13.2 ± 1.9

3.1 ± 0.6

4.990

0.001

Species

Mean dbh with regenerated canopy ± SE (cm)

Mean dbh without regenerated canopy ± SE (cm)

t -statistic

P -value

Coast redwood

31.0 ± 2.9

6.7 ± 1.2

17.981

<0.001

Tanoak

17.3 ± 3.1

6.5 ± 1.4

6.504

<0.001

Douglas-fir

24.3 ± 12.4

21.2 ± 8.3

0.491

0.626

Pacific madrone

27.4 ± 5.9

11.8 ± 2.9

3.419

0.003

Oak

28.8 ± 3.1

7.1 ± 2.4

6.833

<0.001