Table 4 Nutrient stocks in live and dead fine roots of hybrid poplars in relation to genotype and plantation environment.

From: Abiotic and biotic factors controlling fine root biomass, carbon and nutrients in closed-canopy hybrid poplar stands on post-agricultural land

Effects

C (kg/ha)

N (kg/ha)

P (kg/ha)

K (kg/ha)

Ca (kg/ha)

Mg (kg/ha)

Live

Dead

Live

Dead

Live

Dead

Live

Dead

Live

Dead

Live

Dead

Genotype × Environment

DN × M/Brompton

641

87.8

11.48

1.57

1.56

0.19

3.48

0.33

18.5

2.11

1.79

0.29

DN × M/La Patrie

735

163.3

11.97

3.17

1.33

0.27

3.62

0.66

24.3

4.47

1.70

0.40

DN × M/Melbourne

812

117.9

13.23

2.22

0.97

0.16

3.95

0.44

24.5

2.92

1.82

0.27

D × N/Brompton

415

53.9

7.41

1.01

0.72

0.10

3.39

0.27

11.7

1.53

1.21

0.15

D × N/La Patrie

616

144.0

11.47

2.89

1.05

0.26

3.79

0.72

17.9

4.08

1.70

0.36

D × N/Melbourne

480

47.1

8.87

0.96

0.62

0.06

3.38

0.22

13.5

1.10

1.39

0.12

M × B/Brompton

277

57.9

4.91

1.18

0.50

0.11

2.03

0.25

6.2

1.17

0.79

0.19

M × B/La Patrie

626

103.7

9.85

1.92

0.98

0.17

3.20

0.41

15.7

2.20

1.47

0.27

M × B/Melbourne

757

118.5

12.39

2.03

1.01

0.15

4.11

0.43

21.2

2.50

1.89

0.28

SE

67

14.5

1.12

0.26

0.17

0.03

0.52

0.07

1.9

0.33

0.22

0.04

P-value

0.06

0.03

0.05

0.02

0.06

0.06

0.38

0.03

0.04

0.005

0.15

0.13

Environment

Brompton

444

66.5

7.93

1.26

0.93

0.14

2.97

0.28

12.1

1.60

1.26

0.21

La Patrie

659

137.0

11.09

2.66

1.12

0.23

3.54

0.60

19.3

3.58

1.63

0.34

Melbourne

683

94.5

11.50

1.74

0.87

0.13

3.81

0.36

19.7

2.17

1.70

0.22

SE

39

8.4

0.65

0.15

0.10

0.02

0.30

0.04

1.1

0.19

0.13

0.02

P-value

0.002

0.0003

0.004

<0.0001

0.20

0.0005

0.17

0.0002

0.0005

<0.0001

0.07

0.004

Genotype

DN × M

729

123.0

12.23

2.32

1.29

0.21

3.68

0.48

22.4

3.17

1.77

0.32

D × N

504

81.7

9.25

1.62

0.80

0.14

3.52

0.40

14.3

2.24

1.44

0.21

M × B

553

93.3

9.05

1.71

0.83

0.15

3.11

0.36

14.4

1.95

1.38

0.24

SE

39

8.4

0.65

0.15

0.10

0.02

0.30

0.04

1.1

0.19

0.13

0.02

P-value

0.004

0.01

0.007

0.01

0.007

0.02

0.42

0.15

0.0002

0.002

0.11

0.02

  1. Mean values of live fine root nutrient contents (across 3 sampling times) were used in the ANOVA (SE = Standard error of the mean).