大连市2000～2004年农业生态系统能值分析

Emergy Aanalysis of Agricultural Ecology System in Dalian City in 2000～2004

能值为环境、资源、人类劳务、信息和发展决策的分析评价提供了新尺度。为了更好地评价大连市农业种植业对太阳能资源的利用情况和大连市农业的可持续发展情况,本文在简单阐述能值分析理论基础上,运用能值分析方法,计算分析大连市2000年到2004年农业生态系统的能值投入与产出,并根据实际情况构建了能值分析指标体系。从净能值产出率和环境负荷力角度来量化分析大连市农业系统的发展状况。结果表明:从2000年到2004年,大连市农业生态系统净能值产出率分别为9.48、9.24、8.52、8.00和7.59,环境负荷力分别为10.21、11.49、6.26、10.41和9.03。大连市农业生态系统发展整体处于较好态势,但对环境的压力较大,应进一步加大其高科技含量的能值投入,以促进农业系统的更好发展。

Emergy provides new measure for the analysis and evaluation of environment, resource, human work, information and development decision. In this paper, emergy input and output of Dalian agrieuhural system form 2000 year to 2004 year were caculated using emergy analysis approach on the basis of simple ex- patiation of emergy analysis theory, and emergy analysis index system was constructed according to the actural situation in order＇to better evaluate the agricultrual utilization of solar energy resources and the sustainable development of agriculture in this city. The net emergy yield rate and environmental loading were maily described, aimed to quantitatively analyze agricultural conditions of Dalian city. The result indicates that from year 2000 to year 2004, the net emergy yield rates were 9.48,9.24,8.52,8.00 and 7.59, envirnomental loadings were 10.21,11.49,6.26,10.41 and 9.03. The agriculture development of Dalian city is in good situation, but higher stress to environment, and the hi-tech emergy input should be increased to advance the development of agriculture system better.