Table 1 Volatile organic compound emissions of R. tomentosum (RT) from moderate RT (MRT) density and high RT (HRT) groups in early (June) and late (August) season of 2017, median (inter quartile range, ng g−1 h−1). Differences between groups; MRT density and HRT density during both sampling occasions, and differences between June and August emissions from pooled MRT and HRT data were tested with the Mann-Whitney U test, (P < 0.05) emboldened.

From: Understorey Rhododendron tomentosum and Leaf Trichome Density Affect Mountain Birch VOC Emissions in the Subarctic

 

June 17

August 17

Pooled Data (June vs August N = 18)

MRT (N = 12)

HRT (N = 6)

U

P

MRT (N = 12)

HRT (N = 6)

U

P

U

P

Monoterpenes

α–Pinene

166.04 (92.44–894.53)

63.28 (43.99–74.56)

12

0.064

312.11 (102.17–5134.85)

154.13 (135.15–374.4)

32

0.750

100

0.083

Camphene

93.13 (43.01–506.96)

37.07 (27.8–55.84)

17

0.195

126.98 (82.72–3933.87)

137.81(128.32–320.99)

32

0.750

87

0.029

Sabinene

135.49 (102.23–923.58)

81.68(34.08–154.62)

18

0.234

0 (0–6101.61)

0 (0–0)

29

0.553

78.5

0.013

β-Pinene

93.41(57.76–621.15)

43.13(19.51–58.79)

14

0.104

84.46 (40.95–2929.59)

87.85(43.91–216.18)

32

0.750

135.5

0.568

Myrcene

132199.54(60066–214656)

64062 (59484–90397)

26

0.721

174655(77244–234585)

196565(167787–285991)

28

0.494

103

0.103

Δ–3–Carene

6.89 (0–98.61)

0 (0–0)

13

0.064

75.75(24.82–382.05)

0 (0–21.25)

15

0.050

107

0.134

Terpinene

735.97 (233.25–9614.04)

269.63 (76.13–533)

19

0.279

101.02 (10.76–1102.12)

0 (0–107.21)

22

0.213

95.5

0.057

Cymene

174.14 (140.10–2964.79)

141.39 (65.31–196.12)

18

0.234

871.30 (549.91–48331.05)

1464.56 (771.78–4039.82)

32

0.750

46

<0.001

Limonene

206.33 (123.54–630.31)

82.31 (43.71–119.18)

13

0.082

465.66 (203.98–14714.09)

369.78 (261.89–828.88)

31

0.682

76

0.010

(Z)–β–Ocimene

1286 (432.52–1691)

591.09 (352.47–1197.77)

16

0.383

9718.68 (3707–23105)

7771.91 (6906.6–19665.54)

30

0.616

16

<0.001

(E)–β–Ocimene

682.75 (411.29–1969.02)

395.68 (205.75–544.23)

18

0.160

2391(1303.5–8605.3)

3601.72 (2658.7–6061.3)

28

0.494

38

<0.001

γ–Terpinene

176.09 (91.23–1885.44)

93.21 (35.32–139.29)

18

0.234

60.40 (27.91–2057.68)

62.23 (42.58–141.75)

35

0.964

121

0.303

α–Terpinolene

79.75 (52.4–333.25)

26.27 (22.14–79.62)

17

0.195

0 (0–6.52)

0 (0–0)

27

0.437

34

<0.001

Sesquiterpenes

α–Copaene

92.03 (55.42–127.64)

20.04 (19.15–32.94)

15

0.130

5.99 (0–274.28)

0 (0–54.56)

28

0.494

99

0.077

β–Elemene

302.68 (218.52–470.54)

81.68 (66.38–153.07)

14

0.104

0 (0–0)

0 (0–135.2)

30

0.616

42

<0.001

α–Gurjunene

25014 (13867–43497)

10832.43(4578.79–17090)

19

0.279

4421.58 (2181–8536)

3612.63 (3323.3–3920.47)

32

0.750

40

<0.001

(E)–β–Carryophyllene

2849.44 (312.8–13085.9)

3462.07 (246.9–34246)

30

1.000

1708.17 (395.5–4561.61)

2949.3 (678.5–7051.26)

33

0.820

136

0.590

Calarene

835.78 (705.89–1346.21)

383.35 (192.12–461.23)

16

0.160

4513 (1360.9–6797.7)

3601.3 (3396.4–4394.5)

35

0.964

36

<0.001

Azulene

304.37 (243.11–552.93)

173.62 (115.02–243.86)

19

0.279

1322.64 (724.8–2949)

1361.23 (991.24–1419.86)

35

0.964

29

<0.001

α–Humulene

309.48 (168.4–815.49)

570.1 (127.38–940.65)

29

0.959

110.29 (56.94–346.56)

314.54 (273.16–415.27)

20

0.151

100

0.083

Aromadendrene

24198 (17171–30173)

12884.1 (6317–13949.3)

19

0.279

132763 (41354–284546)

163211(131661–19030)

32

0.750

20

<0.001

Ledene

483.46 (385.14–920.15)

281 (127.27–341.22)

18

0.234

871.38 (425.58–1687.63)

955.59 (844.12–1110.07)

32

0.750

89

0.035

Palustrol

27519 (23454–33607.97)

14541 (10143–19643)

16

0.160

195280 (99185–582350)

299182 (199018–323158)

34

0.892

13

<0.001

Ledol

4321.5 (3323.9–5455.57)

2265.3 (1886.3–3032.2)

15

0.130

29916 (14969–9445.3)

45284 (32691.6–46581.9)

33

0.820

6

<0.001

Other Compounds

Bornyl–acetate

203.80 (73.02–1055.02)

36.32 (28.2–179.66)

16

0.160

149.01 (60.45–5717.61)

262.12 (203.4–441.08)

29

0.553

122.5

0.318

6–Methyl–5–hepten–2–one

124.6 (84.21–300.85)

49.02 (46.73–49.7)

5

0.006

229.09 (85.36–427.8)

178.56 (125.86–221.6)

32

0.750

108

0.143

Citronellyl acetate

430.01 (134.65–624.06)

66.25 (57.15–190.04)

16

0.160

4158.7 (1106.8–8645.23)

2829.34 (1212.3–3648.8)

32

0.750

27

<0.001

Geranyl–acetate

1188.61 (283.8–1770.4)

362.6 (187.17–365.29)

16

0.140

5011.7 (1436.9–23411.4)

6117.16 (3346.6–6612.4)

36

1.000

47

<0.001

Total

270097.42 (171639.05–393122.98)

111185.27 (90739.17–185954.08)

17

0.195

728679.93 (358990.6–1515698.74)

741312.18 (702466.33–905714.86)

35

0.964

31

<0.001