Table 4 Coefficients (standard error) obtained in the best-fitted GLMMs for log-transformed estimated biomass components \( {\overset{-}{b\hbox{'}}}_{\mathrm{ST}} \), \( {\overset{-}{b\hbox{'}}}_{\mathrm{CW}} \), \( {\overset{-}{b\hbox{'}}}_{\mathrm{N}} \), \( {\overset{-}{b}}_{\mathrm{CO}} \) and \( {\overset{-}{b}}_{\mathrm{R}} \) (g) and ratios \( {\overset{-}{R\hbox{'}}}_{\mathrm{ST}} \), \( {\overset{-}{R\hbox{'}}}_{\mathrm{CW}} \), \( {\overset{-}{R\hbox{'}}}_{\mathrm{N}} \), \( {\overset{-}{R\hbox{'}}}_{\mathrm{CO}} \) and \( {\overset{-}{R\hbox{'}}}_{\mathrm{R}} \) (on a per unit basis) developed for the dry site (A) and semiarid site (B) according to fixed (age, treatment) and random (σ² _Plot) effects

Fixed effect

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{ST}}\right) \)

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{CW}}\right) \)

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{N}}\right) \)

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{CO}}\right) \)

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{R}}\right) \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{ST}}\right) \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{CW}}\right) \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{N}}\right) \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{CO}}\right) \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{CO}}\right)\mathrm{alternative}\ \mathrm{model} \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{R}}\right) \)

(Intercept)

4.91 (0.09)

5.23 (0.09)

5.24 (0.08)

2.07 (0.15)

6.41 (0.19)

−1.325 (0.008)

−1.009 (0.002)

−0.998 (0.008)

−4.22 (0.14)

−4.14 (0.13)

−1.150 (0.020)

Age 16

1.73 (0.10)

1.63 (0.09)

1.46 (0.08)

1.8 (0.3)

n.i.

0.132 (0.010)

0.032 (0.003)

−0.138 (0.009)

0.52 (0.13)

n.i.

n.i.

T _{10 − 1600}

0.47 (0.15)

0.28 (0.13)

0.32 (0.12)

0.9 (0.3)

0.8 (0.3)

0.115 (0.015)

−0.073 (0.004)

−0.041 (0.013)

n.s.

0.65 (0.21)

0.19 (0.03)

T _{5 − 1600}

0.66 (0.15)

0.47 (0.13)

0.47 (0.12)

0.8 (0.3)

0.7 (0.3)

0.125 (0.015)

−0.063 (0.004)

−0.061 (0.013)

n.s.

0.44 (0.24)

0.18 (0.03)

T _5 + 10

1.02 (0.16)

0.75 (0.15)

0.76 (0.13)

1.1 (0.3)

1.3 (0.3)

0.174 (0.016)

−0.091 (0.005)

−0.087 (0.014)

n.s.

0.23 (0.25)

0.20 (0.03)

T _{5 – 800}

1.03 (0.17)

0.68 (0.16)

0.79 (0.14)

1.5 (0.3)

1.7 (0.3)

0.188 (0.017)

−0.150 (0.005)

−0.057 (0.015)

n.s.

0.21 (0.25)

0.16 (0.03)

T _{10 – 800}

0.77 (0.16)

0.53 (0.15)

0.56 (0.13)

1.5 (0.3)

1.2 (0.3)

0.150 (0.016)

−0.088 (0.005)

−0.067 (0.014)

n.s.

0.95 (0.22)

0.20 (0.03)

σ² _Plot

0.13

0.11

0.09

0.11

n.i.

0.0010

0.00004

0.0010

0.12

0.11

n.i.

AIC

1536.4

1385.8

1245.4

1053.5

687.7

−1830.3

−3553.7

−2069.6

924.6

925.0

−674.0

R ²

0.71

0.70

0.71

0.54

0.40

0.75

0.72

0.68

0.04

0.10

0.43

Fixed effect

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{ST}}\right) \)

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{CW}}\right) \)

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{N}}\right) \)

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{CO}}\right) \)

\( \log\ \left({\overset{-}{b\hbox{'}}}_{\mathrm{R}}\right) \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{ST}}\right) \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{CW}}\right) \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{N}}\right) \)

\( \log \left({\overset{-}{R\hbox{'}}}_{\mathrm{CO}}\right) \)

(Intercept)

2.89 (0.05)

3.06 (0.05)

3.16 (0.05)

2.26 (0.14)

4.08 (0.11)

−1.252 (0.002)

−1.084 (0.003)

−0.980 (0.004)

−2.06 (0.11)

Age 16

1.71 (0.09)

1.74 (0.09)

1.56 (0.08)

0.37 (0.13)

n.i.

0.044 (0.004)

0.0868 (0.0017)

−0.085 (0.003)

−1.77 (0.23)

T _{10 − 1600}

0.78 (0.12)

0.86 (0.12)

0.89 (0.11)

n.s.

1.64 (0.16)

−0.066 (0.006)

n.s.

n.s.

−0.2 (0.3)

T _{5 − 1600}

1.23 (0.12)

1.29 (0.12)

1.28 (0.11)

n.s.

1.90 (0.16)

−0.039 (0.006)

n.s.

n.s.

−0.9 (0.3)

T _5 + 10

1.01 (0.14)

1.07 (0.14)

1.08 (0.12)

n.s.

1.82 (0.17)

−0.049 (0.007)

n.s.

n.s.

−0.4 (0.3)

T _{10 – 800}

0.93 (0.16)

0.98 (0.16)

1.01 (0.14)

n.s.

1.87 (0.19)

−0.051 (0.008)

n.s.

n.s.

−0.2 (0.3)

T _{5 – 9500}

0.83 (0.12)

0.92 (0.12)

0.94 (0.11)

n.s.

1.60 (0.16)

−0.069 (0.006)

n.s.

n.s.

−0.7 (0.3)

σ² _Plot

0.03

0.03

0.03

0.13

n.i.

6 × 10⁻⁵

10⁻⁴

2 × 10⁻⁴

4 × 10⁻⁹

AIC

1473.3

1466.3

1286.0

536.8

603.4

−3392.3

−3647.9

−2770.8

573.6

R ²

0.81

0.82

0.84

0.04

0.63

0.25

0.73

0.47

0.58