区域农业经济发展的能值分析

Emergy analysis of regional agro-economic development

运用能值分析法,研究了辽宁省朝阳与抚顺2个农业经济系统在25年的发展过程中资源利用、产品生产、环境压力以及可持续性的变迁。结果表明:2个农业系统的生产过程对购入资源的依赖性都呈增强的态势,由于较多依赖于购入的不可更新资源,生产过程对当地环境产生较大压力;25年中,系统的生态可持续性急剧下降。在这一过程中,朝阳农业系统表现出可持续性的更快下降,能值可持续指数从1.25下降到0.11;同样的工业化过程给朝阳较脆弱的环境带来更大的压力;与投入更多不可更新资源相比,环境的保护与恢复应该是减少本地不可更新资源流失的更优策略。

Emergy analysis was used to compare the resource utilization, product production, environmental stress, and sustainability of two agro-economic systems in Chaoyang （an agricultural base） and Fushun （an industrial base ） of Liaoning Province over past 25 years. The results demonstrated that during the production process in the two systems, the dependence on purchased resources was increasing, and, because of the higher dependence on the purchased non-renewable resources, a heavier load was produced on the environment. During the past 25 years, the ecological sustainability of the two systems decreased dramatically. In Chaoyang, the sustainability had a more rapid decrease, with its sustainability index being decreased from 1.25 to 0. 11. The same process of industrialization of Chaoyang as Fushun brought more stress to its weaker environment. Environmental protection and restoration rather than greater amount of purchased non-renewable resources should be a good strategy to reduce the loss of non-renewable indigenous resources in two bases.