[1]FU Yan-ling,ZHANG Xiao-ping,CHEN Feng-juan,et al.Land Use/Cover Pattern Survey under the Background of Grain for Green Policy Implementation in the Loess Hilly-Gully Region[J].Research of Soil and Water Conservation,2010,17(06):81-85.
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Land Use/Cover Pattern Survey under the Background of Grain for Green Policy Implementation in the Loess Hilly-Gully Region
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
17
Number of periods:
2010 06
Page number:
81-85
Column:
Public date:
2010-12-20
- Title:
- Land Use/Cover Pattern Survey under the Background of Grain for Green Policy Implementation in the Loess Hilly-Gully Region
- CLC:
- F301.24;X171.4
- DOI:
- -
- Abstract:
- Environment is friable and soil erosion is serious on the Loess Plateau. The irrational land use and low forest coverage are the fundamental reasons responsible for these problems. The land use type turned from farmland to forest/grass with the implementation of the ‘Grain for green’ policy in 1999 is an important measure to improve the ecological environment on the Loess Plateau. The percentage of forest/grass coverage and its pattern changed the processes of surface flow and sediment discharge, influenced the hydrological regime. What it like of the current land use/cover pattern in the region is poorly known. The paper took the catchment of Majiagou in Ansai county, the typical loess hilly-gully region as a research area to check the land use/cover situation after 10-year implementation of the policy. Land use data in 2008 were obtained from the combination work of 2007’s remote sensing image interpretation and field survey in December, 2008, based on the land use map in 1990 provided by the land use bureau of Ansai county. The results showed that the area of the main landuse types of farmland, forest and grassland accounted for 91.6% of the entire catchment. The grassland was most extensive with 56.77% of the total area of catchment, then followed by forest and farmland, the area percentage were 19.60% and 15.25%, respectively. During the field survey, while lots of the slope farmlands were converted to grassland, still a number of slope farmlands exist there. Among the current farmlands, terrace land, slope farmland and other flat land along the river bed occupies 44.8%, 42.4% and 12.9%, respectively. The catchment was divided to upper, middle and lower reaches based on the hydrological system. The concentricity of each landuse types varies in each reaches of catchment. The situation of each landuse types in the upper reaches is similar with that of total catchment. The farmland including orchard, mainly concentrates in the middle reaches due to the gentle landform development. While the forest in the catchment singularly focuses in the lower reaches because of the property of land subject to the Ansai county, which services its ecological function for the whole Ansai county.
- References:
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