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Table 6 Assigned weighing indices for various parameters used for assessment of vegetation quality (Kosmas et al. 1999)

From: Study of desertification sensitivity in Talh region (Central Tunisia) using remote sensing, G.I.S. and the M.E.D.A.L.U.S. approach

Parameter

Class

Description

Type of vegetation

Weight

Fire risk

1

Low

bare land, perennial agricultural crops, annual agricultural crops (maize, tobacco, sunflower)

1

2

Moderate

annual agricultural crops (cereals, grasslands), deciduous oak, (mixed), mixed Mediterranean, macchia/evergreen forests

1.3

3

high

Mediterranean macchia

1.6

4

Very high

pine forests

2

Erosion protection

1

Very high

Mixed Mediterranean macchia/evergreen forests

1

2

high

Mediterranean macchia, pine forests, Permanent grasslands, evergreen perennial crops

1.3

3

Moderate

Deciduous forests

1.6

4

Low

Deciduous perennial agricultural crops (almonds, orchards)

1.8

5

Very Low

Annual agricultural crops (cereals), annual grasslands, vines,

2

Drought resistance

1

Very high

Mixed Mediterranean macchia/evergreen forests, Mediterranean macchia

1

2

high

Conifers, deciduous, olives

1.2

3

Moderate

Perennial agricultural trees (vines, almonds, ochrand)

1.4

4

Low

Perennial grasslands

1.7

5

Very Low

Annual agricultural crops, annual grasslands

2

Plant cover

1

high

> 40%

1

2

Low

20–40%

1.8

3

Very Low

< 20%

2