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Table 5 Relationship between quantitative characteristics of Pergularia tomentosa and soil parameters. Statistic of β shows the contribution of each soil variables on the quantitative characteristics of P. tomentosa. Regression equation is the formula for calculating each plant’s quantitative characteristics

From: Modeling potential habitats for Pergularia tomentosa using maximum entropy model and effect of environmental variables on its quantitative characteristics in arid rangelands, southeastern Iran

Plant properties

Soil properties

β

P value

Regression equation

Length of roots

Sand

0.278

0.029

Length of roots = 0.278 sand + 0.280 silt + 0.193 K + 0.164 CaCO3

Silt

0.280

0.031

Potassium (K)

0.193

0.041

CaCO3

0.164

0.047

EC

0.127

0.079

R square

0.287

 

F

4.76

 

Constant

3.91

 

Height of aerial parts

Sand

0.324

0.022

Height of aerial parts = 0.324 sand + 0.351 silt + 0.213 k + 0.261 EC

Silt

0.351

0.018

Potassium (K)

0.213

0.034

CaCO3

0.153

0.061

EC

0.261

0.038

R square

0.319

 

F

5.08

 

Constant

6.39

 

Density

Sand

0.372

0.018

Density = 0.327 sand + 0.369 silt + 0.281 K + 0.259 EC

Silt

0.369

0.015

Potassium (K)

0.281

0.033

CaCO3

0.259

0.040

EC

0.259

0.040

R square

0.331

 

F

6.73

 

Constant

3.01

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