Ecological Archives E088-193-A5

Brian G. DeGasperis and Glenn Motzkin. 2007. Windows of opportunity: historical and ecological controls on Berberis thunbergii invasions. Ecology 88:3115–3125.

Appendix E (Table E1). Principal component analysis of edaphic variables: factor loading matrix.

Parameter

Axis 1
‘Soil Nutrients’

Axis 2
‘Soil Acidity’

Axis 3
‘Soil Texture’

% Sand

-0.10

0.11

0.45

% Silt

0.13

-0.15

-0.42

% Clay

-0.08

0.11

0.05

OD

-0.16

0.26

-0.12

Soil Drainage

0.17

-0.28

-0.05

OM

0.28

0.24

-0.28

TEC

0.24

0.22

0.21

pH

0.02

-0.40

-0.05

BS

0.02

-0.41

-0.05

C:N

-0.25

0.29

0.02

C

0.25

0.27

-0.28

N

0.35

0.08

-0.26

Ca

0.27

0.11

0.23

Mg

0.35

0.01

0.20

K

0.31

0.02

0.02

Na

0.19

0.12

0.19

S

-0.16

0.10

-0.13

P

-0.02

-0.15

0.19

B

0.07

0.02

0.10

Fe

-0.01

0.34

0.08

Mn

0.25

-0.13

0.26

Al

0.06

0.10

-0.23

Cu

0.21

0.04

0.07

Zn

0.24

-0.10

0.10

   Notes: Abbreviations are as follows: organic depth (OD), % organic matter (OM), total exchange capacity (TEC), and % base saturation (BSAT). Primary loading factors are shown in bold.



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