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《Scientia Geographica Sinica》 2001-01
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Study on Land Use Change in a Small Typical Catchment in Loess Hilly Area ——A Case Study in Danangou Catchment, Yan’an, Shaanxi Province

CHEN Li ding, FU Bo jie, WANG Jun (Research Center for Eco Environmental Sciences, Chinese Academy of Sciences, Beijing 100085)  
Land use change to some extent results from the change of land policy and human environmental consciousness It will lead to profound influence on regional environment, as well as a global change Loess Plateau, as the most serious area of soil erosion in the world, receives a lot of attention from Chinese government and international society The soil erosion is mainly attributed to population growth and irrational land use In this paper, a case study on land use change from the 1970s to the 1990s was carried out in a small catchment in a loess hilly area of northern Loess Plateau through aerial photograph interpretation and using landscape approaches The results indicate that some changes occurred from the 1970s to the 1990s This is greatly due to the change of land policy during early the 1980s when a land reform, the household responsibility system was widely started in countryside in China With the new land policy carried out in countryside, the manner and environmental consciousness of local farmers on land use has changed a lot, which results in land use modification and conversion ① Compared to 1975, areal percentage of terrace farmland, sloping farmland, sparse woodland, bushland in 1997 declines obviously,while the percentage of woodland, orchard and unused land increases The increase of woodland, bushland and orchard, and the decrease of sloping farmland in steep slope sections are helpful for soil erosion control ② Considering the mean patch area, it is becoming bigger for terrace farmland, woodland, bushland and unused land in 1997 than that in 1975, whereas it is smaller for sloping farmland and sparse woodland and orchard in 1997 than that in 1975 This reflects that with the implementation of household responsibility system in countryside, most agricultural activities are carried out in small group, that induce the patch size of the human closely related land use types becoming smaller (excluding terrace farmland), such as sloping farmland and orchard, and the patch size of the human less related land use types becoming bigger, such as woodland, sparse woodland, bushland and orchard ③ The fractal dimension of orchard and sloping farmland in 1997 is bigger than that in 1975, which implies the shape of patch of these land use types is getting complex, while the fractal dimension is becoming smaller for woodland, sparse woodland, bushland, terrace farmland and unused land in 1997 ④ Compared to 1975, the landscape isolation for woodland, bushland, orchard and unused land is decreasing and it is increasing for sparse woodland, terrace farmland and sloping farmland in 1997 ⑤ As a whole of the catchment, landscape diversity is becoming bigger and patch number unit area increases This phenomenon indicates the land use is tending to diverse and landscape become fragmented from whole ⑥ The relative land use rationality index in 1997 is a little bigger than that in 1975, but the difference is very small It means the land use structure is improved, but it is much below the ideal situation for controlling soil erosion The increase of relative land use rationality index is mainly due to land use change in steep slope area where the area of woodland, bush land, orchard and unused land increase a lot and the area of sloping farmland is reduced
【Fund】: 国家杰出青年科学基金资助项目!( 4 972 5 10 1);; 欧盟国际合作项目资助!(IC18CT970 15 8)
【CateGory Index】: F301.24
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