摘要
为更好地评价天津市农业生态经济系统的运行特征和可持续发展状况,文章利用能值分析理论通过构建评估指标体系,对天津市农业生态系统的能值投入产出状况、环境承载情况和生态系统运行效果进行了定量分析。研究结果显示天津市农业生态系统能值产出率相对较高,可持续发展能力较强,但化肥、农药和地膜等工业辅助能值大幅增加,造成对生态环境的较大压力。天津市应调整其能值投入和产出结构,加大农业科技的研究和推广力度,降低以化肥为代表的工业辅助能投入,以促进其农业的可持续性。
This paper structures the index system for agroecosystem emergy estimation and quantitatively analyzes the emergy input and output,environmental loading and running effect of ecological system to better evaluate the operating characteristics and sustainable development of agriculture in Tianjin based on the theory of emergy analysis.The results showed that the agroecosystem in Tianjin had higher efficiency of emergy output and more powerful sustainable development capacity,but chemical fertilizer,pesticide and plastic film etc.Unrenewable industrial emergy input substantially increased in the agroecosystem led greater pressure to the ecological environment which should be payed attention to.Tianjin should adjust the structure of agricultural input and output emergy,strengthen the research and extension of agricultural science and technology and properly decrease non-renewable industrial assistance emergy represented by fertilizer to promote sustainability of its agricultural development
出处
《生态经济》
北大核心
2010年第10期65-69,共5页
Ecological Economy
基金
国家科技攻关课题(2004BA508B01)
长江学者和创新团队发展计划(IRT0412)
