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Table 3 Treatments, seed origin, original size and number of survivals of seedlings in September 2011

From: Warming and neighbor removal affect white spruce seedling growth differently above and below treeline

Habitat

Temperature

Neighbors

Site#

n

Origin 1

Origin 8

Origin 9

Height (cm)

#Needles

Length (cm)

Dead

Survived n

Above

Control

Control

a

15

3

0

12

4.56 (1.60)

136.6 (53.1)

1.47 (0.20)

4

11

treeline

Control

Removal

b

14

3

0

11

4.49 (1.52

150.0 (61.0)

1.54 (0.19)

0

14

(1169 m)

High

Control

c

14

3

0

11

4.00 (1.43)

118.4(53.5)

1.49 (0.19)

0

14

 

High

Removal

d

14

3

0

11

4.17 (1.85)

113.1 (46.9)

1.46 (0.12)

0

14

 

Above site total/average

57

   

4.31 (1.60)

129.5 (53.6)

1.49 (0.18)

4

53

Near

Control

Control

e

15

3

0

12

4.02 (1.07)

162.2 (64.5)

1.55 0.23)

0

15

treeline

Control

Removal

f

14

3

0

11

4.86 (1.53)

173.9 (82.1)

1.61 (0.21)

0

14

(680 m)

High

Control

g

14

3

0

11

4.77 (1.13)

142.2 (43.2)

1.59 (0.21)

1

13

 

High

Removal

h

14

3

1

10

5.69 (0.84)

146.6 (42.2)

1.59 (0.17)

0

14

 

Near site total/average

57

   

4.84 (1.14)

156.23 (58.0)

1.59 (0.21)

1

56

Below

Control

Control

k

15

3

1

11

4.13 (1.30)

139.5 (54.3)

1.39 (0.16)

2

13

treeline

Control

Removal

l

14

3

1

10

4.36 (1.27)

156.9 (70.6)

1.47 (0.21)

0

14

(617 m)

High

Control

i

14

3

1

10

4.94 (1.88)

155.3 (78.8)

1.49 (0.19)

8

6

 

High

Removal

j

14

3

1

10

4.96 (1.44)

162.4 (67.2)

1.55 (0.20)

0

14

 

Below site total/average

57

 

4.60 (1.47)

153.5 (67.7)

1.48 (0.19)

10

47

 

Total/Average

171

 

4.58 (1.41)

146.4 (59.8)

1.52 (0.19)

15

156

  1. A total of 12 treatments were tested on 171 white spruce seedlings. After two summers, 156 (or 91%) of seedlings survived. In the “High” treatment, temperature was increased by small greenhouses. Above ground neighboring plants were removed in “Removal” plots. “Origin” is where the cones of the seeds were collected. “Origin 1” = 675 m, “Origin 8” = 725 m, “Origin 9” = 640 m. Mean “Height,” number of needles “#Needles,” and length of the longest needles “Length” (+SD) were measured at the time of planting. “Dead” and “Survived n” were recorded in September 2011.