Skip to main content

Table 2 Factor loadings in factor analysis of soil and plant variables for 432 pipeline sites

From: Environmental rehabilitation of damaged land

Variables

Factor 1

Factor 2

Factor 3

ON_OFF

0.83a

− 0.05

0.09

Density (mg·L)

0.87a

0.33

0.09

P (mg·kg−1)

−0.48a

0.04

0.02

K (mg·kg−1)

−0.63a

−0.15

0.12

Ca (mg·kg−1)

0.01

−0.88a

0.27

Mg (mg·kg−1)

−0.00

−0.88a

0.17

Acidity (cmol·kg−1)

−0.00

−0.02

− 0.97a

Cations (cmol·kg−1)

− 0.04

−0.98a

0.17

H+

−0.07

0.33

−0.73a

Zn (mg·kg−1)

−0.59a

0.05

0.03

Mn (mg·kg−1)

−0.28

0.07

−0.19

Cu (mg·kg−1)

−0.36

−0.07

− 0.01

Carbon (%)

−0.88a

− 0.25

−0.08

Clay (%)

−0.14

−0.53a

− 0.12

Pasture structure

−0.84a

0.09

−0.11

  1. A factor loading is the correlation with the factor/axis. Variation accounted for was 41% on axis 1, 31% on axis 2 and 25% on axis 3. ON_OFF: ON (1) was on the pipeline construction servitude and OFF (0) was on adjoining undamaged land. pH was expressed as hydrogen ion concentration (H+). Pasture structure was rated (5 – lawn, 4 – near lawn, 3 – more grass than bare ground, 2 – more bare ground than grass, 1 – sparse to bare). Data, except ON_OFF were standardized (standardized value = (Xi – mean)/σ where Xi is the value to be transformed, mean is the average of the paired values ON and OFF the construction servitude (i.e. (Xi + Xj)/2) and σ is the standard deviation for all the values of that variable in the database)
  2. a Significant factor loading