论文部分内容阅读
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。
Soil salinization severely restricts the agricultural development in arid areas and also poses a significant threat to the stability of the oasis ecosystem. In the study area of Yutian Oasis, the information of soil salinization was quantitatively extracted by using remote sensing data and field investigation. The temporal and spatial evolution of soil salinization in oasis was analyzed by dynamic and centripetal migration models. The results showed that during the study period, the area of lightly salted land first decreased and then increased, and the center of gravity migrated to the northeast. The area of moderate salted land continued to decrease, the center of gravity first migrated to the southeast and then to the northeast, and that of heavy salted land increased first Less, the center of gravity to the southeast after the migration to the northwest; salty ground area showed a decreasing trend, the center of gravity to the northeast migration. During the 34 years, the land use of various types of land in Yutian Oasis changed significantly. The conversion between saline land and farmland and woodland, grassland and other land types was relatively frequent. The drastic changes of salinized soils in the 1990s showed that the local government changed the land pattern Has a significant impact. This study plays a supportive role in the prediction and prediction of oasis salinization.