JOURNAL OF NATURAL RESOURCES ›› 2021, Vol. 36 ›› Issue (1): 196-207.doi: 10.31497/zrzyxb.20210113

• Ecosystem and Ecological Preservation • Previous Articles     Next Articles

Construction of ecological zone based on value-risk ecological function area in the Upper Yellow River

XIE Li-xia1(), BAI Yong-ping1(), CHE Lei2, QIAO Fu-wei1, SUN Shuai-shuai1, YANG Xue-di1   

  1. 1. School of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
    2. School of Architecture and Urban Planning, Nanjing University, Nanjing 210093, China
  • Received:2020-05-06 Revised:2020-08-21 Online:2021-01-28 Published:2021-03-28
  • Contact: BAI Yong-ping E-mail:xlxyuqiao@126.com;baiyp@nwnu.edu.cn

Abstract:

The ecological environment in the upper reaches of the Yellow River is fragile, and ecological and environmental problems such as soil erosion and land degradation continue to threaten the health of the ecosystem and the quality of human settlements. In order to explore the safety status of the ecological environment in the ecological function area in the upper reaches of the Yellow River, this article quantitatively analyzed the spatio-temporal distribution of ecosystem service value and ecological risk index based on land use data in 2000, 2010 and 2018, with the help of ecosystem service models and ecological risk models, and built four types of ecological divisions through z-score standardized methods. The results show that: (1) During the study period, various land use types changed to varying degrees. Among them, construction land increased most significantly due to the transfer of cultivated land and grassland, with an increase area of 118 km2 and a growth rate of 46.36%. (2) The overall service value of the study area has a small degree of change, the ecosystem services are mainly regulating services and the grassland provides the highest value. High service value areas are mainly distributed in areas with high vegetation coverage such as the southwestern part of Linxia prefecture and Zhuoni county. (3) The ecological risk level of the study area is generally low, showing the characteristics of "high in the north and south, but low in the middle". The low and low ecological risk areas account for more than 76% of the total area. (4) Little changes have taken place in the four types of ecological zoning, indicating that the ecological zoning is in a relatively stable state of development. The continuity of the spatial distribution of different ecological zones is poor, among which high ecosystem service value-high ecological risk area (I) is the most typical. Constructing ecological zoning through ecosystem services and ecological risks (value-risk) can provide a theoretical basis for coordinating the relationship between humans and land in the region and clarifying future development directions.

Key words: ecosystem services, ecological risk, ecological zoning, ecological function area in the upper reaches of the Yellow River