[Dynamic changes of land desertification landscape pattern in agriculture and pasturage interlaced zone of northern Shaanxi].
By using the 1986, 1993 and 2003 Landsat TM images and with the help of GIS, the dynamic changes of land desertification landscape pattern in agriculture and pasturage interlaced zone of northern Shaanxi in 1986-2003 were analyzed. The results showed that in the past 17 years, the desertification area in the zone decreased by 206,655.2 hm2, with the patches in landscape structure reduced and fragmentation abated. Fortunately, the desertification degree decreased obviously, and moderate and light desertification took the leading position. From 1986 to 2003, the spatial centroid of desertification landscape patches expanded southwestward and northeastward, giving serious threat to the ecological safety of the southeast and northeast loess gully and hilly areas.
Jia
Ke-Li
KL
College of Resources and Environment, Ningxia University, Yinchuan 750021, China. jiakeli@163.com
Chang
Qing-Rui
QR
D000383:Agriculture / Q000379:methods; D002681:China; D003247:Conservation of Natural Resources / Q000379:methods* / Q000639:trends; D018556:Crops, Agricultural / Q000254:growth & development*; D004784:Environmental Monitoring / Q000379:methods*; D040362:Geographic Information Systems; D005843:Geography; D006109:Poaceae / Q000254:growth & development*; D013997:Time Factors