植被作为陆地生态系统的重要组成部分，在干旱半干旱地区的荒漠化防治及水土保持过程中起着至关重要的作用。植被覆盖度则是衡量植被及生态环境状况的重要指标。为了解2000—2020年汾河流域的植被覆盖及生态环境状况，分析了植被覆盖度的空间格局及其变异特征、探讨了植被覆盖度对生态工程的响应关系。结果表明：（1）汾河流域的植被覆盖度呈增加趋势，从2000年的55%增加到2020年的72%， 年增加速率为0.87%，主要表现为高和极高植被覆盖度（>60%）区域面积的增加。汾河流域的生态环境质量得到了极大的改善。（2）在生态工程的影响下，植被覆盖度呈增加的区域面积高达77.1%；而受城镇化及矿产资源开发的影响，有1.7%的区域植被覆盖度呈减小趋势。（3）汾河流域植被覆盖度的时空变异性强，变异系数在0.01~2.20范围波动，仅原有高山林区、河谷农业区及城镇建设区的植被较为稳定。该研究能够为制定生态环境保护和可持续发展相关政策提供一定的理论依据。

Vegetation is an important component of terrestrial ecosystems， and it plays an important role in preventing desertification and conserving soil and water in arid and semi-arid regions. Fractional vegetation coverage （FVC）， in turn， is an important indicator of vegetation and ecological environment status. To understand the ecological status from 2000 to 2020 in Fenhe River Basin， this study examined the spatial distribution and temporal variations of vegetation coverage， investigated the vegetation response to ecological protection project. Our results demonstrate that： （1） The FVC increase from 55% in 2000 to 72% in 2020， with an increase rate of 0.87% per year， which is manifested with the increase of the high FVC area （FVC>60%）. The ecological environment quality of the region has been significantly improved. （2） Under the influence of ecological protection project， FVC increase in 77.1% of the area， and decrease in 1.7% of the area under the urbanization and mineral resources development. （3） The spatial and temporal variability of FVC are great， and the coefficient variation fluctuates between 0.01 and 2.20. The FVC is stable in original alpine forest area， valley agricultural area and urban construction. This study would provide a theoretical basis for formulating polices related to ecological environmental protection and sustainable development.