Research Article

Analysis of Spatial and Temporal Distribution Characteristics of Land Desertification Based on GIS and Remote Sensing Images

Table 2

Feng Yusun’s desertification classification system.

CharacteristicSeriousStrongly developingIn developmentPotential

Proportion of desertification land>50%25–50%5–25%<5%
Expansion rate of desertification land>40%40–20%5–20%<5%
Dune typeLarge area crescent dunes or dune chainsBeam-shaped dunes are dominant and crescent-shaped dunes occasionally appearBeam-shaped sand dunes, shrub sand piles, and sand ridges intersectThere is basically no quicksand distribution
Relative height of dune undulation (M)>2510–255–10<5
Degree of dune activityMobile duneSemimobile duneSemifixed duneFixed dune
Vegetation coverage on sand dunes<15%15–30%30–50%>50%