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| Remote Sensing quantitative evaluation for desertification degree of Nenjiang sandy land:A case study with in Durbote Autonomous County of Mongolian Minority |
| Li Mingze,Ying Tianyu,Fan Wenyi,Liu Lijuan |
| Forestry School,North East Forestry University,150040,Harbin,China |
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Abstract Autonomous County of Mongolian Minority,Durbote is located at the center of Nenjiang sandy land,which was a good representation to study the Nenjiang sandy desertification degree.The remote sensing information model was used in this study for the quantitative evaluation of the desertification degree to this region.The desertification degree of the 63 selected plots in the study area were investigated,simultaneously the ETM+ remote sensing images were obtained.And from the images the main desertification appraisal factors such as vegetation cover degree,biomass and percentage of the bare sandy land occupying the land were retrieved quantitatively by remote sensing;the surface crust and the soil texture were extracted by the qualitative method combining with the visual interpretation.The quantitative remote sensing information model taking a pixel as a unit for desertification degree estimation was established and then the desertification degree map was output,which was all based on the existing desertification appraisal methods.The model precision was evaluated by using 63 measured plots,and among which 57 plots were exactly estimated.The result indicated that,the precision of the remote sensing information model for the quantitative evaluation to the desertification degree in autonomous county of Mongolian minority,Durbote was up to 90.5%.
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Received: 10 April 2008
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