Monitoring salinification of land in Hexi Corridor using 3Stechnology

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.