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Table 4 Fixed parameter estimates of NSURMEM systems for larch, birch, and poplar

From: Two new methods applied to crown width additive models: a case study for three tree species in Northeastern China

Species

CR

β1•

β2•

β3•

β4•

β5•

Larch

CRE

3.8037

3.8883

0.0998

0.1889

− 0.0006

 

CRS

3.2882

3.0203

0.1225

0.2527

− 0.0009

 

CRW

3.6294

3.3858

0.0867

0.2169

 
 

CRN

3.4222

3.3558

0.1007

0.1783

− 0.0005

Birch

CRE

2.6272

2.1502

0.1156

0.2105

 
 

CRS

3.0998

2.1666

0.1022

0.2635

 
 

CRW

2.5994

1.7896

0.1009

0.2193

 
 

CRN

3.3363

3.4137

0.0806

0.1289

 
 

CRE

3.4938

0.3981

0.0089

  

Poplar

CRS

4.4542

4.8763

0.0714

  
 

CRW

0.2443

0.7746

− 0.003

  
 

CRN

3.2133

0.4691

0.0091

0.0211

 
  1. Note: All the fixed parameters are statistically significant at P = 0.05