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为了研究土地利用、土地覆盖的时空变化 ,本文在遥感技术与GIS技术的支持下 ,对不同土壤侵蚀背景下土地利用的时间动态特征和空间动态特征进行了定量分析。具体表现为通过空间分析 ,对中国近五年来不同土壤侵蚀背景下的土地利用类型 ,如耕地状况、森林植被覆盖、城镇工矿建设用地等时空特征进行了动态分析。研究结果表明 :我国土壤侵蚀以水力、风力、冻融侵蚀为主 ,水力侵蚀以微度水力侵蚀为主 ,在微度水力侵蚀区 ,耕地、草地、建设用地面积增加 ,其中耕地增加最多 ,林地、未利用地面积逐渐减少。风力侵蚀以剧烈风力侵蚀为主 ,在微度风力侵蚀区 ,草地面积减少 ,而未利用地的面积增加 ;在轻度、中度、强度风力侵蚀区 ,耕地、林地、未利用地用地面积增加 ,草地面积减少。在冻融侵蚀区 ,草地面积有显著增加 ,而未利用地面积减小
In order to study the temporal and spatial variations of land use and land cover, this paper quantitatively analyzes the temporal and spatial characteristics of land use under different soil erosion backgrounds with the support of remote sensing and GIS technologies. Specifically, through spatial analysis, this paper analyzes the temporal and spatial characteristics of land use types, such as the status of cultivated land, the coverage of forest vegetation and the construction land in cities and towns, under different background of soil erosion in recent five years in China. The results show that the soil erosion in our country is dominated by hydraulic, wind and freeze-thaw erosion. The micro-hydraulic erosion is the main cause of soil erosion. In the micro-erosion area, the area of cultivated land, grassland and construction land is increased, of which cultivated land increases most, , The area of unused land gradually decreased. Wind erosion is dominated by intense wind erosion. In the micro-wind erosion area, the grassland area decreases while the unused land area increases. In mild, moderate and strong wind erosion areas, the area of cultivated land, woodland and unused land is increased , Reduce the area of grassland. In the freeze-thaw erosion area, the area of grassland increased significantly while the area of unused land decreased