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Table 3 General allometric models for Abies alba biomass components. Models are based on three diameters (DRC—diameter at root collar, D0.5—diameter at 0.5 m height, and DBH—diameter at breast height)

From: Tree and stand level estimations of Abies alba Mill. aboveground biomass

Diameter

Component

Eq. no

a

SE[a]

b

SE[b]

c

SE[c]

u j

CF

RMSE

R 2 m

R 2 c

DRC

n = 16

DRC range

0.7–11.3 cm

Height range

0.3–6.3 m

Aboveground

13

− 2.60547

0.22591

1.06247

0.37944

1.39773

0.33754

0.0000

1.0113

0.146

0.997

0.997

Aboveground woody

13

− 3.07196

0.31298

0.91378

0.41909

1.72415

0.39489

0.2640

1.0131

0.008

0.988

0.996

Branches

13

− 4.22588

0.41898

1.54416

0.70372

1.00042

0.62601

0.0000

1.0394

0.212

0.989

0.989

Foliage

13

− 3.69032

0.36331

1.20764

0.61021

1.13981

0.54283

0.0000

1.0294

0.037

0.990

0.990

Stem bark

13

− 5.02144

0.43219

0.45193

0.75587

1.84473

0.68661

0.0000

1.0356

0.016

0.987

0.987

Stem total

13

− 3.43335

0.36220

0.44436

0.34862

2.28506

0.33572

0.4178

1.0088

0.191

0.979

0.998

Stem wood

13

− 3.76452

0.30392

0.77274

0.32818

1.94581

0.31452

0.3271

1.0078

0.218

0.986

0.998

D 0.5

n = 14

D0.5 range

0.2–9.1 cm

Height range

0.5–6.3 m

Aboveground

13

− 1.91236

0.09289

0.18876

0.29233

2.07559

0.37450

0.0000

1.0189

0.791

0.993

0.993

Aboveground woody

13

− 2.36744

0.09654

0.26503

0.30383

2.03557

0.38923

0.0000

1.0204

0.513

0.993

0.993

Branches

13

− 3.14868

0.15257

0.54799

0.48016

1.63134

0.61512

0.0000

1.0517

0.081

0.981

0.981

Foliage

13

− 2.95231

0.13813

0.09444

0.43470

2.08166

0.55689

0.0000

1.0422

0.190

0.983

0.983

Stem bark

13

− 4.72405

0.11465

0.45410

0.36082

1.71718

0.46224

0.0000

1.0289

0.006

0.989

0.989

Stem total

13

− 3.23079

0.39359

− 0.15275

0.25734

2.91320

0.43691

0.5152

1.0105

0.274

0.964

0.997

Stem wood

13

− 3.50774

0.49951

− 0.16127

0.25981

3.07588

0.44894

0.6716

1.0104

0.242

0.949

0.997

DBH

n = 88

DBH range

1.8–63.9 cm

Height range

2.9–32.8 m

Aboveground

13

− 2.48516

0.28663

1.90231

0.11133

0.62866

0.18528

0.1903

1.0119

28.235

0.979

0.991

Aboveground woody

12

5.16624

0.06113

0.89161

0.01784

–

–

0.1956

1.0102

47.204

0.981

0.993

Branches

13

− 3.70762

0.62553

3.01194

0.23149

− 0.86826

0.39545

0.4337

1.0504

9.996

0.905

0.965

Foliage

13

− 3.07447

0.48945

2.81850

0.20541

− 0.96138

0.32846

0.3061

1.0435

15.474

0.923

0.961

Stem bark

13

− 5.67189

0.35442

1.52137

0.15001

1.23647

0.23886

0.2203

1.0231

3.332

0.969

0.984

Stem total

13

− 3.70737

0.22648

1.59163

0.08859

1.25977

0.14689

0.1495

1.0075

40.182

0.989

0.995

Stem wood

13

− 3.90009

0.21207

1.60258

0.08385

1.27505

0.13824

0.1387

1.0068

35.245

0.990

0.996

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Annals of Forest Science

ISSN: 1297-966X