title: [Dynamic monitoring on land cover in loess hilly and gully area by the methods of RS and GIS].
abstract: By the integration of RS and GIS, with the TM data obtained from Landsat 5 in 1990 and the ETMplus data from Landsat 7 in 2000, and after geometrical rectifying and amplifying and man-machine screen decoding data image, the map of eco-environment and land use/cover in Yanhe watershed and its vicinities in 1990 and 2000 was obtained respectively, and the results of statistic analyses showed that in comparing with 1990, the artificial land in 2000 increased by 31%, the area of agricultural land was stable and that of orchard was 2.82 times more, and the area of artificial forest increased remarkably and that of shrub was 6 times more. The coverage rate increased to 13.88%, and the area of wilderness was 44.8% of that in 1990. The quality of eco-environment was improved remarkably in this area.
authors.affiliation: Northwest Sci-Tech University of Agricultural and Forestry, Yangling 712100, China. Changqr@public.xa.sn.cn
authors.forename: Qingrui
authors.initials: Q
authors.lastname: Chang
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: Qinke
authors.initials: Q
authors.lastname: Yang
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000383:Agriculture; D003247:Conservation of Natural Resources; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods*; D040362:Geographic Information Systems