Skip to main content

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