宁夏天然草原沙化动态监测与评价

Dynamic Monitoring and Evaluation of Desertification of Natural Grassland in Ningxia

利用遥感技术结合地面调查,获取了2000—2015年宁夏中北部地区4个时期的沙化草地监测结果,通过GIS空间分析,掌握了该区域沙化草地的分布现状和动态变化情况。结果表明:监测时段内草地始终是这一区域的主导土地类型,15年间沙化草地面积和占比变化不大,但沙化程度整体呈现逆转态势,中度和重度沙化草地向轻度沙化草地转化明显;同时受自然气候因素、人为扰动等影响,局部草地沙化仍在发生发展,草地沙化形势依然严峻。

Using remote sensing technology combined with ground surveys,the monitoring results of four phases of desertification grassland in the central and northern Ningxia from 2000 to 2015 were obtained.Through GIS spatial analysis,the distribution status and dynamic changes of desertification grassland in the region were mastered.The results showed that grassland was always the dominant land type in this area during the monitoring period.The area and proportion of desertified grassland did not change much in the past 15 years,but the overall degree of desertification showed a reverse trend,and the conversion of moderately and severely desertified grassland to mildly desertified grassland was obvious.At the same time,affected by natural climatic factors,human disturbance,etc.,local grassland desertification is still developing,and the situation of grassland desertification is still severe.