Research Article
Analysis of Spatial and Temporal Distribution Characteristics of Land Desertification Based on GIS and Remote Sensing Images
Table 5
SPEI and statistics of drought change trend.
| Project | Variation trend of SPEI in years and seasons | Variation trend of different drought grades | Year (%) | Spring (%) | Summer (%) | Autumn (%) | Winter (%) | Mild (%) | Moderate (%) | Extreme (%) |
| Increasing trend | 26 | 19 | 36 | 33 | 48 | 78 | 81 | 69 | Significant increase | 6 | 0 | 1 | 1 | 6 | 17 | 38 | 4 | Reducing trend | 74 | 81 | 64 | 67 | 52 | 22 | 19 | 31 | Significant reduction | 43 | 43 | 12 | 17 | 7 | 0 | 0 | 1 |
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