Abstract: The loess hilly region has a vulnerable ecological environment and serious soil and water erosion. Its ecological restoration and landscape plantation play an important role in the regional ecological security,improving the ecological quality and promoting the construction of ecological civilization. In this study,the ecological vulnerable area of the loess hilly region in Inner Mongolia was taken as the research area. The methods of remote sensing analysis was used to analyze the normalized difference vegetation index (NDVI),vegetation coverage and ecological vulnerability index before and after artificial vegetation restoration,as well as the dynamic changes of soil and water conservation capacity with the restoration status. The results showed that:the restoration measures of artificial vegetation in the study area are gradually conducive to the enhancement of the self-recovery ability of that ecosystem. After 10 years of restoration,the lands with average vegetation cover of NDVI >0.5 in the two restoration zones increased from 0.61% to 34.52%. The lands with average vegetation coverage >60% increased by 52.46%. The average proportion of weakly vulnerable lands increased to 76.20%,and the proportion of lands with good soil and water conservation capability increased to 59.07%. The self-recovery capacity of ecosystem showed a good trend. The results can provide scientific basis and theoretical reference for ecological restoration in loess hilly region.

Key words: Ecological restoration, Ecological vulnerability, Remote sensing image, Loess hilly region

摘要： 黄土丘陵生态环境脆弱、水土流失严重，其生态修复与植物景观营造对于保障区域生态安全、改善流域生态环境、带动流域生态文明建设具有重要作用。本研究以内蒙古黄土丘陵生态脆弱区为研究对象，应用遥感分析的方法，分析了采取人工植被修复措施后生态修复区治理前后的归一化植被指数(Normalized difference vegetation index，NDVI)、植被覆盖度、生态脆弱性指数以及水土保持能力随修复状况的动态变化规律。结果表明：采取人工植被恢复措施使得生态系统的自我恢复能力逐渐增强。经过10年的治理，两个修复区NDVI 0.5的平均面积占比从0.61%增加到34.52%；植被覆盖度>60%的平均面积占比增加了52.46%；微度脆弱区域面积占比平均上升至76.20%，水土保持能力较好的面积平均占比提高到59.07%，生态系统自恢复能力呈变好态势。研究结果可为我国黄土丘陵区生态修复工作的开展提供科学依据和理论参考。

关键词: 生态修复, 生态脆弱性, 遥感影像, 黄土丘陵区