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Table 4 Allometries of root biomass and root to shoot (R/S) ratios for planted and coppice trees

From: Modeling the above and belowground biomass of planted and coppiced Eucalytpus globulus stands in NW Spain

Rotation

Predicted variable

Equation

Eq. N

a r

b r

k r

c

E

R 2

RMSE

Planted

Root biomass

WR = ar1 + br1ln(d)

19

−430.4512 (55.0978)

174.3656 (19.1802)

  

0.886

0.887

19.71

R/S ratio

R/S = krs1exp(c*d)

20

  

1.0291 (0.1588)

−0.0352 (0.0039)

0.880

0.88

0.05

Coppice

Root biomass

WR = ar2 + br2ln(deq)

21

−578.3233 (71.134)

280.285 (25.226)

  

0.826

0.824

41.30

R/S ratio

R/S = krs2exp(c*deq)

22

  

3.0493 (0.504)

−0.045 (0.006)

0.824

0.83

0.20

  1. WR root biomass (kg dry matter), R/S root to shoot ratio, d diameter at breast height (cm), deq equivalent diameter at breast height of the same basal area as the sum of basal areas of the coppiced shoots of one tree root, Eq. N equation number, E modeling efficiency, R2 coefficient of determination between the measured and estimated values, RMSE root-mean-square error
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Annals of Forest Science

ISSN: 1297-966X