Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (12): 2552-2560.doi: 10.3864/j.issn.0578-1752.2012.12.026

• RESEARCH NOTES • Previous Articles    

Emergy Analysis of Agro-ecosystem of Resource-based City in Vulnerable Eco-regions ——A Case of Yulin City

 LI  Jun-Li, CAO  Ming-Ming   

  1. 1.西北大学城市与环境学院,西安 710127
    2.山东曲阜师范大学地理与旅游学院,山东济宁 273165
  • Received:2011-11-15 Online:2012-06-15 Published:2012-02-29

Abstract: 【Objective】 The development state and major sustainable development obstacle of ago-ecosystem about resource-based city in vulnerable eco-regions were studied. 【Method】 The input and output state and comprehensive development level of ago-ecosystem in Yulin city, from 2000 to 2008 were analyzed by using the method of emergy analysis.【Result】The results of emergy input and output showed that the main emergy input of agro-ecosystem of Yulin city was unpaid emergy. The industrial assistant emergy of the total emergy input ratio in 2008 was only 1/4 of the national average, while the labor emergy accounted for up to 68% of renewable organic emergy; the ago-ecosystem of Yulin city was still in the stage of traditional agriculture and depended on manpower and environmental resources. The results of comprehensive evaluation showed that the development potential in Yulin City is high and it has strong sustainable ability of ago-ecosystem. The development state of the natural ago-ecosystem is relatively superior. The development state of the economic ago-ecosystem is low, but the development potential is great. The development state of the social ago-ecosystem was improved, but the production efficiency of rural labor was low. In 2008, the production superiority degree index was 0.71 and the competitive industry (livestock) was obvious; the system stability degree index was only 0.49 and the stability of itself needs to be enhanced; the emergy sustainability index was 2.76 and the ago-ecosystem was a dynamic system. 【Conclusion】Some measures should be taken to make the ago-ecosystem input and output emergy to a higher level and make the traditional extensive mode to modern scientific technology, highly intensive and high efficiency, such as improving renewable resources use efficiency, optimizing system structure, increasing the investment of agricultural science and technology assistant emergy.

Key words: vulnerable eco-regions, resource-based city, emergy analysis, ago-ecosystem

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