中文摘要：

利用遥感资料和地理信息技术，准确界定了岷江上游干旱河谷的范围，分析了岷江上游干旱河谷面积的变化及其与局地环境的关系、聚落与非聚落区干旱河谷边界位移的差异．研究表明：岷江上游干旱河谷主要位于海拔1501～3000m的15°-45°阳坡地带；随着退耕还林等生态工程的实施，1999—2009年干旱河谷的面积减少了157．48km2；受人类活动的影响，聚落和非聚落区的干旱河谷边界在垂直方向均有所下降，且存在显著差异：聚落区、非聚落区干旱河谷边界分别下降61．15、48．20m．研究结果可为岷江上游干旱河谷植被恢复、资源合理利用和生态建设提供重要的科学参考．

英文摘要：

Based on remote sensing data and the geographic information system, the distribution of dry valleys in the upper reaches of the Mingjiang River was quantified. The changes in the area of dry valleys and their relationship with the local environment, and the differences of boundary displacements between settlement and non-settlement areas were analyzed, with the results： The main distribution area of dry valleys were located on sunny slopes where the altitudes are between 1 501 m and 3 000 m and the slopes are between 15° and 45°. With the implementation of ecological projects, such as green instead of grain, the dry areas decreased by 157.48 km2 from 1999 to 2009. Affected by human＇s activities, the vertical displacements of dry valleys decreased, both in settlement and non-settlement regions, but the decreases were distinctly different, with the settlement region being decreased by 61.15 m and the non-settlement region by 48.20 m. The study can provide references for vegetation restoration, rational use of resources and ecological development in the dry valleys of the upper reaches of the Minjiang River.