Ecological factors

Evaluation standards

Classification

Evaluation value

Weights

Slope gradient and length

The bigger the slope gradient and length is, the higher sensitivity of ecological construction

>25˚, <12 m

5

0.250

5˚ - 25˚, 12 m - 60 m

3

<5˚, >60 m

1

Soil erodibility

The higher the soil erodibility is, the higher sensitivity of ecological construction

Sandy soil, clay

5

0.250

Light loam

3

Medium loam

1

Surface runoff sediments

The more surface runoff sediment is, the higher sensitivity of ecological construction

Runoff and sediments collecting area

5

0.100

Runoff and sediments source area

3

Runoff and sediments formative area

1

Soil and water loss

The more serious the soil and water loss is, the higher sensitivity of ecological construction

Serious

5

0.150

General

3

Slight

1

Plants coverage

The more the plants coverage is, the higher sensitivity of ecological construction

<50%

5

0.150

50% - 90%

3

>90%

1

Pollution

The more serious pollution is, the higher sensitivity of ecological construction

High

5

0.100

Medium

3

Low

1