中文摘要：

土壤盐渍化严重制约着干旱区农业发展，也对绿洲生态环境的稳定构成重大威胁。以于田绿洲做研究区，运用遥感数据，结合实地考察，定量提取土壤盐渍化信息；利用动态度与重心迁移模型，分析绿洲土壤盐渍化时空演化过程。结果表明：在研究期间，轻度盐渍地面积先减后增，重心向东北方向迁移；中度盐渍地面积持续减少，重心先向东南后向东北方向迁移；重度盐渍地先增后减，重心先向东南后向西北方向迁移；盐渍地总面积呈减少趋势，重心向东北方向迁移。34年间，于田绿洲各类型土地利用变化显著，盐渍地与农田及林地、草地和其他地类间的转化比较频繁，90年代盐渍化土壤的剧烈变化，说明当地政府对土地格局的变化有着重要影响。本研究为绿洲盐渍化现象的预测预报起到一定的支撑作用。

英文摘要：

Soil salinization seriously restricted agricultural development in arid zone. It was also an important factor affecting the stability of the oasis ecological environment. Selected Keriya Oasis as the study area and four remote sensing images at the same period in 1977, 1991, 1999 and 2011 as the main data sources in this study, based on 3S technology and combined with several field trips. The soil salinization of Keriya oasis was extracted and analyzed quantificationally. The results showed that during the study period, the mild saline area first decreased and then increased, the center of gravity migrated to the northeast. Moderate saline soil area continued to decrease, the center of gravity migrated from southeast to northeast. Heavy saline soil area first increased then decreased, the center of gravity migrated from southeast to northwest. The total area of salinized soil tended to decrease with the migration of the center of gravity to the northeast. During 34 years, the variation of land use for various Keriya oasis types were significant. Meanwhile, the conversion among saline soil and forestry land, grassland and other land types was relatively frequent. The results indicated spatial and temporal dynamic distribution of the saline soil would have a positive significance to sustainable development of oasis.