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.

ProjectVariation trend of SPEI in years and seasonsVariation trend of different drought grades
Year (%)Spring (%)Summer (%)Autumn (%)Winter (%)Mild (%)Moderate (%)Extreme (%)

Increasing trend2619363348788169
Significant increase6011617384
Reducing trend7481646752221931
Significant reduction434312177001