A study on the spatial-temporal changes of land-use in loess plateau in northern Shaanxi Province

Aim To study the spatial-temporal changes of land-use in loess plateau in northern Shaanxi Province.Methods Based on the ETM image of 1990,2002,land-use type map,soil-vegetation distribution map of loess plateau,physical geography document and sample field survey,land-use on loess plateau is studied,matrix of land-use types diversion is gave out.Results In the past 10 years,garden changed fastest,communication-land and farmland changed secondly,annual rate of each of them are 20.48% 1.94%~1.57%.water area changed slowly annual rate is only 0.13%.Conclusion From 1990 to 2002,by synthetically administer barren land and sand have changed into woodland and grassland.It is showed that cultivated grass and tree planting have a prominent distinction on improving ecological environment.