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Article Dans Une Revue Photo-Interprétation. European Journal of Applied Remote Sensing (PIEJARS) Année : 2003

EVALUATION OF LAND USE AND COVER CHANGES IN NORTH SHAANXI, CHINA

Résumé

As a transitional belt between the Mu Us Sandy Land and Loess Plateau, the north part of Shaanxi is one of the ecologically vulnerable arid areas in northwest China, which are subject to the impacts of both natural factors and human activity. It is therefore of special importance to select such an area to carry out an intensive land use change study and establish a dynamic monitoring system thereof aiming at understanding the change mechanism, human-environmental relationships and producing useful references for the central and local governments in their sustainable land use planning. Multitemporal Landsat images were used for change detection by adopting a synthetic method including atmospheric correction, Tasseled Cap transformation, indicator differencing, thresholding, change type identification and county-level quantification. A classification on the recent image was conducted to quantify the present land use and cover pattern. A panel analysis calibrated by multivariate regression model was applied to reveal the driving forces of land cover changes and understand the interaction between the human activities and environment modifications by incorporating the results obtained in the change detection with the county-level socio-economic data. The regression modelling results suggest that the vegetation degradation — the predominant change type in the study area, is probably related to the soil erosion (R2 = 0.985) and grassland degradation; the farmland extension, occurring principally in the valleys in the Yulin County, is associated with the food product increase (R2 = 0.987); the urban extension, spatially related to coal mining, is linked to the urban population growth (R2 = 0.881); and the surface decrease of water-bodies, having taken place in the sandy land, is negatively correlated to the cultivated land change (R2 = 0.562). Therefore, the factors which govern these land use and cover changes are various human socio-economic activities, and the root cause of land degradation is, however, some unreasonable land use policies.
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Dates et versions

hal-00014204 , version 1 (21-11-2005)

Identifiants

  • HAL Id : hal-00014204 , version 1

Citer

Weicheng Wu. EVALUATION OF LAND USE AND COVER CHANGES IN NORTH SHAANXI, CHINA. Photo-Interprétation. European Journal of Applied Remote Sensing (PIEJARS), 2003, Vol.39, p.15-29, plates p.35-45. ⟨hal-00014204⟩
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