【摘要】 以2004年和2009年TM影像作为基础数据源,利用人机交互判读的方式建立研究区盐渍化土地数据库.结果表明:河西走廊地区盐渍化土地总面积为671 039.7hm2,主要分布在三大内陆河流域下游的地下水浅埋区;对比2期数据发现在研究期内河西走廊地区盐渍化土地面积呈现增加的趋势,盐渍化程度呈减轻趋势,表现为从2004年到2009年研究区盐渍化土地面积增加12 313.2hm2,年变化率为0.4%,重度以上盐渍化土地占全部盐渍化土地比例由31.2%降低到27.1%.究其原因,盐渍化土地的形成与自然因素密切相关,但人类的活动则对盐渍化土地的形成具有重要的驱动作用.更多还原

【Abstract】 Landsat TM image data in 2004 and 2009(The resolving power is 30m)of Hexi Corridor was taken as main information source,by judging of man and computer together and field investigation,then the status quo and changes of salinification of lands were analyzed.The results showed that the total area of the salinification land in Hexi Corridor was 671 039.7hm2,mainly distributed in the lower reaches of three big inland river basin in shallow groundwater areas.Comparing of data in 2004 and 2009,we found the area of the salinification land in Hexi Corridor was increased,while the degree of salinity reduced.From2004 to 2009,the area of the salinification land in Hexi Corridor increased 12 313.2hm2,with annual change rate of 0.4%.Severe salinization land to total land ratio decreased from 31.2%to 27.1%.Investigate the reason,formation and natural factors of saline land are closely related,but human activities on land formation did an important driving role.更多还原