L-layer

Mound

CC

log10DTW

Wetland

SW

MX

BZ

+

+

+

DP

+

+

+

HS

+

+

+

PC

+

+

PS

+

+

+

+

SF

SG1

+

+

SG2

− (slope)

+

+

Number of variables with positive trends

7

2

3

2

6

1

Number of variables with negative trends

8

1

3

3