以2002年、2007年Landsat5影像和2013年Landsat8影像为数据源,通过ENVI和Arc GIS对遥感影像进行校正和处理并提取采样点的土壤反射率盐分指数对12年来柳城子水库下游土壤盐渍化时空变化特征进行分析,结果表明:12002~2013年,土壤平均反射率盐分指数逐年升高2002年(0.164)<2007年(0.183)<2013年(0.206);2在0~1200 m范围内土壤SI1(盐分指数)表现为2013>2007>2002年,但在1200~2400 m变幅较小,各年盐渍化趋于稳定;32002、2007、2013年SI1具有强烈空间相关性,空间自相关变化尺度逐年增加,表明区域因素(地下水)对土壤盐渍化空间变异性影响逐渐增长并向下游不断扩展;4在研究时段内,由于水库蓄水量的增加(2007年库容由2002年4×106m~3扩建为6×106m~3),水库对下游土壤盐渍化的影响不断增强,导致其盐渍化程度逐渐加剧。2013年比2002年轻度、中度盐渍化土壤面积分别减少69.44%、37.57%,而重度盐渍化、盐土则从无到有分别增加了722589.71 m~2、1941395.51 m~2。不论是空间上,还是时间上,水库下游土壤盐渍化状况总体趋于更加恶化。 Based on Landsat5 images and Landsat8 images in 2002 and 2007, the remote sensing images were corrected and processed by ENVI and Arc GIS, and the soil reflectance and salinity index of sampling points were extracted for the analysis of the soil salinization in the downstream of Liuchengzi Reservoir in 12 years The results showed that the soil average reflectance index increased year by year from 2002 to 2013 (0.164) <2007 (0. 183) <2013 (0.206); 2 Soil SI1 (salt index) showed a small amplitude change from 1200 to 2400 m in 2013> 2007> 2002, and salinization tended to be stable in all years. SI1 had strong spatial correlation and spatial autocorrelation in 32002, 2007 and 2013 The scale of change increases year by year, indicating that the influence of regional factors (groundwater) on the spatial variability of soil salinization gradually increases and extends to the downstream. 4 During the study period, due to the increase of reservoir water storage capacity (2007: 4 × 106m ~ 3 is expanded to 6 × 106m ~ 3). The impact of reservoirs on soil salinization in the lower reaches is continuously increasing, leading to a gradual increase in the degree of salinization. In 2013, the area of ​​mild and moderate salinization soil decreased by 69.44% and 37.57% respectively compared with that of 2002, while that of heavy salinization and saline soil increased by 722589.71 m ~ 2,194,1395.51 m ~ 2 from none. Soil salinization downstream of reservoirs has tended to worsen overall, both spatially and temporally.