The particle-size classification of moving dune and semi-fixed dune was better, which showed a strong positive bias and a sharp peak.
移动沙丘和半固定沙丘分选较好，表现出极强的正偏和较尖的峰值；
The analysis to sandy desertification land types shows that the moving sand dune decreases, semi-fixed sand dune and fixed sand dune increase.
从沙化土地类型上分析，流动沙地面积减少，半固定、固定沙地面积增加。
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