Abstract
Based on the TM remote sensing images obtained in Guyuan County of Hebei Province in 1998,2003 and 2008 and the land-use map as well as field data of the study area,the authors analyzed the spatial and temporal patterns for dynamics changes of the vegetation cover in Guoyuan County in the past ten years by using the dimidiate pixel model and expert classifier and consulting the statistical data with the purpose of understanding the situation of ecological control The results show that most areas were in the moderate and relatively high cover in the three monitoring periods,with the vegetation cover being improved in general.The condition of vegetation cover was stable between 1998 and 2003,and was improved between 2003 and 2008.The areas with slightly increased vegetation cover was mainly distributed in the plateau farming-pasture area,and the stable areas were mainly distributed in the southern low mountain areas.The effect of the regulation project is remarkable.
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