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Table 7 Estimated parameters for the selected growth model (M3) for each forest type

From: Estimating the productive potential of five natural forest types in northeastern China

Forest type

All

Broad-leaved mixed forest

Mixed broadleaf-conifer forest

Mongolian oak forest

Larch forest

Birch forest

N

384

192

30

92

37

33

Trees

30,135

15,284

2748

7097

2314

2692

Eq. 1

a0

1.3957***

1.4079***

1.7628***

1.3226***

1.9215***

1.5099***

a1

0.0151***

0.0120***

0.0100**

−0.0038ns

0.0019*

0.0170***

a2

−2.0886***

−2.2830***

−4.1406***

−0.7157*

−1.247**

− 1.7083*

a3

1.1049***

1.1180***

1.0500***

1.2122***

1.0747***

1.0173***

Eq. 2

b0

1.1418***

3.0958***

6.1632***

0.5858ns

−0.9892ns

3.8268*

b1

0.0837***

0.0820***

0.0741***

0.1261***

0.0410***

−0.0250ns

b2

0.0168ns

−0.0377*

−0.1250**

− 0.0010ns

0.0960*

− 0.0356ns

b3

0.0018***

0.0001ns

−0.0022**

0.0025***

0.0069**

0.0022ns

  1. *indicates a significance at the p < 0.05 level; ** indicates a significance at the p < 0.01 level; *** indicates a significance at the p < 0.001 level; and ns indicates no significance was observed