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Table 4 For each hypothesis equation, the p values, root mean square error (RMSE) and R2 between the dependent and independent variables are given. The number of samples is shown in parentheses

From: Age effect on tree structure and biomass allocation in Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies [L.] Karst.)

Equations

Scots pine (162)

Norway spruce (163)

p

RMSE

R2

p

RMSE

R2

Wf = ηsAc

< 0.05

7.78

0.694

< 0.05

28.91

0.789

Ab = ηs/ηbAc

< 0.05

0.01

0.765

< 0.05

0.02

0.880

Wb = ρbφbHbAb

< 0.05

8.69

0.886

< 0.05

36.61

0.900

ln(Hb) = bln(Hc) +  ln (γb)

< 0.05

1.39

0.661

< 0.05

1.98

0.629

 Vc = φcHcAc

< 0.05

0.11

0.988

< 0.05

0.38

0.976

 φs = (1 + r)/2r

< 0.05

0.03

0.987

< 0.05

0.13

0.979

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Annals of Forest Science

ISSN: 1297-966X