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.
| Characteristic | Serious | Strongly developing | In development | Potential |
| Proportion of desertification land | >50% | 25–50% | 5–25% | <5% | Expansion rate of desertification land | >40% | 40–20% | 5–20% | <5% | Dune type | Large area crescent dunes or dune chains | Beam-shaped dunes are dominant and crescent-shaped dunes occasionally appear | Beam-shaped sand dunes, shrub sand piles, and sand ridges intersect | There is basically no quicksand distribution | Relative height of dune undulation (M) | >25 | 10–25 | 5–10 | <5 | Degree of dune activity | Mobile dune | Semimobile dune | Semifixed dune | Fixed dune | Vegetation coverage on sand dunes | <15% | 15–30% | 30–50% | >50% |
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