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Table 2 Tested allometric equations, where y is dry biomass (in kilograms per tree), d is diameter at breast height (in centimeters), h is tree height (in meters), and cl is crown length (in meters)

From: Intra-specific differences in allometric equations for aboveground biomass of eastern Mediterranean Pinus brutia

Equation number

Expression

1

ln y = b 0 + b 1 ⋅ ln d

2

ln y = b 0 + b 1 ⋅ ln d + b 2 ⋅ ln h

3

ln y = b 0 + b 1 ⋅ ln d + b 2 ⋅ ln cl

4

ln y = b 0 + b 1 ⋅ ln d + b 2 ⋅ h + b 3 ⋅ ln h

5

ln y = b 0 + b 1 ⋅ d + b 2 ⋅ ln d + b 3 ⋅ h

6

ln y = b 0 + b 1 ⋅ ln(d 2 ⋅ h)

7

ln y = b 0 + b 1 ⋅ ln d + b 2 ⋅ ln(d 2 ⋅ h)

8

ln y = b 0 + b 1 ⋅ (ln d)2 + b 2 ⋅ ln(d 2 ⋅ h)

9

ln y = b 0 + b 1 ⋅ ln d + b 2 ⋅ ln d 2 + ln h

10

\( \ln y={b}_0+{b}_1\cdot \ln d+{b}_2\cdot \ln h+{b}_3\cdot \frac{d}{h^2} \)

11

\( \ln y={b}_0+{b}_1\cdot \frac{d}{d+{b}_2} \)

12

\( \ln y={b}_0+{b}_1\cdot \frac{d}{d+{b}_2}+{b}_3\cdot h \)

13

\( \ln y={b}_0+{b}_1\cdot \frac{d}{d+{b}_2}+{b}_3\cdot \ln h \)

14

\( \ln y={b}_0+{b}_1\cdot \frac{d}{d+{b}_2}+{b}_3 \ln cl \)

15

\( \ln y={b}_0+{b}_1\cdot \frac{d}{d+{b}_2}+{b}_3\cdot h+{b}_4\cdot \ln h \)

16

\( \ln y={b}_0+{b}_1\cdot \frac{d}{d+{b}_2}+{b}_3 \ln h+{b}_4 \ln cl \)