长株潭城市群农业生态系统的能值分析及可持续发展评价

Emergy Analysis of Agro-economic System and Sustainable Development Assessment in Changsha-Zhuzhou-Xiangtan Urban Agglomeration

利用能值分析理论和方法对长株潭城市群农业生态系统的投入产出状况、运行效率和环境负载率进行了系统分析。分析结果表明,该城市群农业生态系统能值投入主要以不可更新工业辅助能源为主,农业生产成本过高;在能值产出中林业和畜牧业能值产出较大,而种植业和渔业所占比例较小;环境负载率低于发达国家和地区水平,具有较大的发展空间。为了获得更高的能值产出,促进该城市群农业生态系统的健康、可持续发展,长株潭城市群应当优化能值投入与产出结构,大力发展该区域的特色农业与生态农业,建立多层次、高功效、低能耗的农业生态系统。

The input-output condition,work efficiency and environmental load of the agro-ecosystem in the Changsha—Zhuzhou—Xiangtan urban agglomeration were systematically assessed based on the theory and method of emergy analysis.Results showed that the nonrenewable supplemental emergy dominated over the agro-ecosystem emergy input in the urban agglomeration and thus caused a high cost of the production.The majority of emergy output was forestry and animal husbandry,while crop cultivation and fishery had a relatively low percentage.The environment load ratio was lower compared with developed countries and regions and thus the agro-ecosystem had a large development space.From the perspective of emergy analysis,the Changsha—Zhuzhou—Xiangtan urban agglomeration should optimize its input-output structure of emergy to improve the quality of the emergy products,to keep its sustainable and healthy development and to establish an agro-ecosystem with multi-level,high function and low emergy consumption.