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Arid Land Geography ›› 2019, Vol. 42 ›› Issue (2): 433-443.doi: 10.12118/j.issn.1000-6060.2019.02.23

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Ecological migration process and the evaluation of its ecosystem service value in Loess hilly and gully region: A case study of Haiyuan County, Ningxia

WANG Peng1,2, LIU Xiaopeng1,2, WANG Yajuan1,2, HAN Xiaojia3,4, WEN Shengqiang1,2   

  1. (1 School of Resources and Environment,Ningxia University,Yinchuan 750021,China;
    2 Key Laboratory (China - Arab) of Resource Evaluation and Environmental Regulation of Arid Region in Ningxia
    750021,China;
    3 Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
    4 University of Chinese Academy of Sciences, Beijing  100049,China)
  • Online:2019-03-25 Published:2019-03-07

Abstract: Taking Haiyuan County, Ninxia Province, China as the research object, based on the remotely sensed data in 2000, 2005, 2010 and 2015, the land use dynamics, ecosystem service value evaluation model and Geo-detection model are used to map the ecology of Haiyuan County from 2000 to 2015 to analyze the temporal and spatial changes in ecosystem service value. The results show that the land use types in Haiyuan County have been changed significantly from 2000 to 2015. The area of forest land, construction land, water area and garden area were increased by 24 532.56 hm2, 13 233.71 hm2, 1 093.58 hm2 and 812.16 hm2 respectively, while the cultivated land, grassland and unused land area showed a declining trend with the unused land area being decreased the most by 21 333.05 hm2. During the 15 years, the ecosystem services value in Haiyuan County showed an increasing trend from 37.25×108 yuan in 2000 to 62.23×108 yuan in 2015 with the change rate of 67.07%. The increase of forest land, garden land and water area was the key to the increase of the ecosystem services value in Haiyuan County. From the perspective of the spatial distribution of the ecosystem service value, it displayed a decreasing trend from southwest to northeast. The value of individual service in the study area showed an increasing trend, with the largest increase in waste treatment and water conservation, followed by biodiversity and climate regulation. The  food production, raw material production and entertainment culture were having the lowest increase. It indicated a list in the descending order of the ecosystem services value as follows:  the ecosystem adjustment Services, Support Services, Supply Services and Culture Services. The deterministic q values of grassland, garden, forest land, climate regulation, soil formation and protection, and biodiversity conservation were all larger than 0.8, which indicated that these six factors had important impact on the changes in the ecosystem services value in the study area.

Key words: ecological migration process, loess hilly and gully area, ecosystem services value, geography detector, Haiyuan County