退耕还林还草; 景观格局; 景观类型; 关川河流域; 黄土高原," /> 退耕还林还草; 景观格局; 景观类型; 关川河流域; 黄土高原,"/> Effect of Grain-for-Green Project on Evolution of Landscape Pattern in the Guanchuan River Basin, Dingxi

›› 2014, Vol. 31 ›› Issue (3): 410-415.

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Effect of Grain-for-Green Project on Evolution of Landscape Pattern in the Guanchuan River Basin, Dingxi

LI Hai-fang1,2, WEI Wei1, CHEN Jin3, LI Xu-chun3, ZHANG Bai-lin3   

  1. 1.State Key Laboratory of Urban and Regional Ecology, Research Center for EcoEnvironmental Science, Chinese Academy
    of Sciences, Beijing 100086, China;
    2.College of Tourism, Guilin University of Technology, Guilin 541004, Guangxi Zhuang Autonomous Region, China;
    3.Institute of Soil and Water Conservation, Dingxi 743000, Gansu Province, China
  • Received:2012-12-26 Revised:2013-03-26 Online:2014-05-15 Published:2014-05-30

Abstract: Based on the field investigation and the remote sensing images in 1995, 2000, 2005 and 2010, the land use change and landscape pattern change after implementing the Grain for Green project in the Guanchuan River Basin in Dingxi, Gansu Province were studied using remote sensing analysis and geographical information system (GIS). The results showed that the main types of land use were the farmland, forestland and grassland, and their proportions were changed from 56.86%, 9.01% and 31.92% to 28.50%, 20.01% and 48.30%, respectively during the period of 1995-2010. However, the area of building land was continuously enlarged, and that of waters was sharply reduced. Fragmentation of landscapes was enhanced, and the patch shape index was decreased to some extent. The landscape pattern revealed that the change of the indexes of dominance, diversity, evenness and connectivity was not so significant. The implementation of the Grain for Green project from 1999 was an important factor of enlarging the areas of forestland and grassland on the Loess Plateau. About 50.95% farmland was changed to grassland, but 46.24% forestland and grassland were converted to farmland, which revealed that there was still a big pressure for enlarging the areas of forestland and grassland due to the continuous population growth and urban expansion in the drainage basin. Furthermore, the sharp reduction of area of waters in the drainage basin revealed that the environment of water resources became worse. It was difficult to explain the relationship between the implementation of the Grain for Green project and the reduction of area of waters. Our study would provide a scientific basis for investigating the relationship between the Grain for Green project and the hydrological process and for controlling soil erosion on the Loess Plateau.

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