Ecological Archives E091-015-A6

Richard K. Kobe, Meera Iyer, and Michael B. Walters. 2010. Optimal partitioning theory revisited: Nonstructural carbohydrates dominate root mass responses to nitrogen. Ecology 91:166–179.

Appendix F. Parameter estimates for models relating fine-root surface area to non-storage root mass.

Parameter estimates (and 95% CI) for the best supported models are shown and were selected using AICc. Different letters designate significant differences among treatments within a species. ∆surface is the percent changes in fine-root surface area from high to low N within each light level and species based on the linear models.

Species

Treatment

N

Model

A (95% CI)

B (95% CI)

r2

∆surface

AB

HLHN

23

y = Ax

191.69 (166.66, 216.73) a

 

0.74

58

 

HLLN

24

y = Ax

302.05 (270.49, 333.61) b

 

0.78

 
 

LLHN

10

y = Ax

270.81 (227.86, 313.76) b

 

0.55

  7

 

LLLN

20

y = Ax

289.89 (255.47, 324.31) b

 

0.78

 

BC

HLHN

19

y = Ax

324.62 (303.22, 346.01) a

 

0.98

14

 

HLLN

23

y = Ax

368.76 (333.22, 404.30) b

 

0.86

 
 

LLLN/HN

12

 

No convergence

     

BO

HLHN

10

y = Ax

115.36 (79.96, 150.76) a

 

0.34

28

 

HLLN

11

y = Ax

147.24 (126.55, 167.93) ab

 

0.60

 
 

LLHN

10

y = Ax

138.25 (117.12, 159.37) ab

 

0.62

24

 

LLLN

10

y = Ax

171.29 (134.07, 208.51) bc

 

0.52

 

RM

HLHN

12

y = A*(x.B)

228.34 (192.09, 264.58)

0.59 (0.49, 0.69)

0.96

 
     

y = Ax

386.29 (329.82, 442.76) a

 

0.96

31

 

HLLN

12

y = Ax

507.70 (343.23, 672.17) a

 

0.40

 

RO

HLHN

24

y = Ax

97.94 (83.00, 112.88) a

 

0.78

54

 

HLLN

22

y = Ax

150.53 (130.50, 170.57) bc

 

0.80

 
 

LLHN

23

y = Ax

140.52 (125.26, 155.77) b

 

0.58

17

 

LLLN

24

y = Ax

164.01 (145.93, 182.10) c

 

0.77

 

SM

HLHN

12

y = A*(x.B)

130.26 (104.80, 155.72)

0.44 (0.29, 0.60)

0.87

 
     

y = Ax

205.54 (161.23, 249.84) a

 

0.83

44

 

HLLN

9

y = Ax

296.00 (212.91, 379.08) b

 

0.80

 

WO

HLHN

16

y = Ax

113.17 (86.91, 139.44) a

 

0.67

  6

 

HLLN

22

y = Ax

120.47 (107.66, 133.28) a

 

0.82

 
 

LLHN

23

y = Ax

132.81 (111.70, 153.92) a

 

0.15

-11

 

LLLN

23

y = Ax

118.5 (97.58, 139.43) a

 

0.14

 

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