JOURNAL OF NATURAL RESOURCES ›› 2011, Vol. 26 ›› Issue (11): 1879-1889.doi: 10.11849/zrzyxb.2011.11.007

• Resources Ecology • Previous Articles     Next Articles

Land Use Change and Eco-Environmental Vulnerability Evaluation in the Danjiangkou Reservoir Area

LIAO Wei1,2, LI Lu3, WU Yi-jin1, SHI Zhi-hua4   

  1. 1. College of City and Environmental Science, Huazhong Normal University, Wuhan 430079, China;
    2. The Center of Soil and Water Conservation Monitoring, Hubei Province, Wuhan 430071, China;
    3. Hubei Water Resources Research Institute, Wuhan 430070, China;
    4. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling 712100, China
  • Received:2011-01-06 Revised:2011-05-08 Online:2011-11-20 Published:2011-11-20

Abstract: The Danjiangkou Reservoir is the source of water for the Middle Route Project under the South-to-North Water Transfer Scheme (SNWT) in China. The eco-environment of Danjiangkou Reservoir Area (DRA) plays an important role in water conservation and purification and would have significant implications for the economic prosperity in Hanjiang Basin as well as for the SNWT. In order to analyze the relationships between different land use patterns and eco-environment in the DRA, RS and GIS technologies were adopted, and an environmental numerical model was developed using spatial principal component analysis (SPCA) method. The land use and eco-environmental vulnerability dynamic change in the last 18 years were analyzed and discussed. The general tendency of land use change in the study area was that the proportion of forest, shrub, grassland, urban and rural land increased constantly from 48.76%, 10.13%, 5.32%, 0.35%, 0.47% to 50.41%, 12.43%, 6.91%, 0.8%, 1.49% between 1990 and 2007, and that of cropland and paddy field decreased gradually from 28.26%, 0.64% to 20.90%, 0.55% between 1990 and 2007. During this period, the land use pattern in the DRA was under the tremendous pressure from the conflict between the rapid urbanization, economic development and the eco-environmental protection and recovering. From 1990 to 2007, the average eco-environmental vulnerability synthetic index (EVSI) in the study area decreased from 5.96 to 5.56, which showed that the eco-environment of the DRA had been improved. However, the eco-environment in some areas even went worse despite of large-scale eco-environmental protection and recovering. In the DRA, most of forest, shrub and grassland were at potential or slight vulnerable levels, and the rest of the land use types basically at slight, moderate or heavy vulnerable levels. Land use types were closely correlated with eco-environment. The order of EVSI was: urban land>rural residential land>waste land>cropland>orchard>grassland>paddy field>shrub and forest land, which indicated that measures taken based on forest and shrub are the priority and important means for ecological restoration. Furthermore, the urban and rural residential land and cropland were the essential problems of the eco-environmental protection and recovering.

Key words: Land use change, eco-environmental vulnerability, spatial principal component analysis (SPCA), Danjiangkou Reservoir Area

CLC Number: 

  • F301.2