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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (1): 239-248.doi: 10.13287/j.1001-9332.202001.011

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Comparison on driving mechanism of county ecological efficiency: With three counties in the mountainous area of southern Ningxia, China as an example

ZHOU Jun-jun1, FAN Xin-gang2, YANG Mei-ling1,3*, XIAO Cheng-quan1, JIA Hong-li1   

  1. 1College of Resources and Environment, Ningxia University, Yinchuan 750021, China;
    2West Development Research Center, Ningxia University, Yinchuan 750021, China;
    3Ministry of Education-Ningxia (China-Arab) Key Laboratory of Resource Evaluation and Environmental Regulating of Aird Area, Yinchuan 750021, China
  • Received:2019-05-08 Online:2020-01-15 Published:2020-01-15
  • Contact: E-mail: nxdxyml@163.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41761116) and the First-class Discipline Construction Project of Ethnology in Ningxia University (NXYLXK2017A02).

Abstract: With Tongxin, Xiji, and Longde counties in the mountainous area of southern Ningxia as the research area, we used extended-exergy analysis (EEA) to compare their ecological efficiency driving mechanism in 2008-2017 to explore the causes of their variation in ecological degradation. The results showed that the overall difference of ecological efficiency in the three counties was significant during the study period. The ecological efficiency of Tongxin was low, with large inter-annual variation. The ecological efficiency of Xiji was stable, and the overall efficiency of Longde was the highest. The difference of exergy scale was small among the three counties. The exergy proportion in the economic sectors was not coordinated, which were dominated by agricultural and residential sectors. The economic sectors presented significant capital-pull-type and labor-intensive characteristics, indicating the driving force for ecological degradation mainly came from agricultural production and residents’ lives in underdeveloped regions. The system’s internal exergy conversion rate and the external energy exchange rate of the three counties were extremely low, constituting a simple network circulation path with high input, low storage, low opening and low conversion, which weakened the endogenous development of social economic subsystem and threatened the fragile ecosystem.