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Table 3 Impacts of environmental variables on the log abundances of woody species using ANNs

From: Modeling effects of abiotic factors on the abundances of eight woody species in the Harana forest using artificial networks, random forest, and generalized linear models

Variables

Standardized Olden value on log abundances of woody species

C. arabica

P. falcatus

C. macrostachyus

C. africana

S. guineense

O. capensis

D. abyssinica

F. decipenses

Soil pH

0.2

− 0.5

2.7

− 0.2

− 0.1

− 0.1

− 0.2

0.3

CEC

0.7

− 0.4

0.5

0.0

0.1

− 0.3

− 0.3

1.0

Phosphorus

0.1

− 0.6

− 0.8

− 0.3

− 1.5

− 0.4

− 0.5

0.5

Potassium

0.0

− 0.6

0.4

− 0.2

0.1

− 0.3

− 0.3

− 0.6

Calcium

0.3

− 0.5

0.8

− 0.2

− 0.4

− 0.4

− 0.6

0.3

Magnesium

− 3.8

3.0

0.0

− 2.1

0.0

− 0.5

− 0.2

0.1

SOM

0.9

2.1

0.4

3.4

2.2

2.6

3.7

1.1

Nitrogen

− 0.2

− 0.5

− 2.3

0.6

− 1.1

− 1.1

0.2

− 2.6

C/N

− 0.2

1.0

− 0.2

0.5

2.7

2.7

1.0

− 0.1

Clay content

0.7

− 0.5

0.4

0.0

− 0.3

− 0.2

− 0.3

0.6

Silt content

0.1

− 0.5

0.0

− 0.3

− 0.2

− 0.2

− 0.2

0.5

Sand content

0.7

− 0.7

0.0

− 0.3

− 1.0

− 0.8

− 0.1

-0.6

Temperature

0.3

− 0.2

0.0

0.0

0.2

− 0.3

− 0.3

0.9

Precipitation

0.0

− 0.2

− 0.1

− 0.2

0.0

0.1

− 0.4

0.3

Elevation

0.0

− 0.2

− 1.5

− 0.3

− 0.4

− 0.3

− 0.6

− 2.2

Slope

0.1

− 0.5

− 0.2

− 0.2

− 0.3

− 0.2

− 0.3

− 0.1