定西市农业生态经济系统能值分析

摘要

Emergy analysis using theories and methods of Dingxi City in 2008 and 2012 the value of in-vestment in agriculture can be eco-economic system-the output value of the structure and main energy ef-ficiency indicators were analyzed and studied.The results showed that the system EIR overall upward trend,rising from 1.59 to 1.81;ESR in 2008 was slightly higher (0.39 ),and the remaining four remained at around 0.35,small fluctuations;EYR overall downward trend,dropping from 1.25 in 2008 to 1.22;s sta-ble at between 1.25~1.30;r overall downward trend,dropping from 0.65 to 0.61;n overall upward trend, rising from 0.34 to 0.39;ELR showed an increasing trend,rising from 1.83 to 2.21;SDI was declining trend,falling from 0.68 to 0.55,five-year average of 0.59,SDI<1.After analysis,Dingxi agricultural eco-economic system emergy increases during 5 years,the level of agricultural modernization has increased,but it can lower the value of the resource utilization efficiency and relatively stable system to withstand envi-ronmental pressures increase,decrease sustainability,which belongs to the consumer type of economic sys-tem.Dingxi City to promote the sustainable development of agriculture should be based on the premise of protecting the ecological environment,improve the degree of exploitation of environmental resources,make full use of auxiliary energy value and improve the utilization efficiency of freshwater resources,investments in technology to improve local agricultural production level improve the system can utilize the potential and capacity for sustainable development.%运用能值分析理论和方法,对定西市2008~2012年农业生态经济系统的能值投入-产出结构和主要能值效率指标进行了分析和研究.结果表明：该系统EIR整体呈上升趋势,从1.59上升至1.81；ESR在2008年略高(0.39),其余四年维持在0.35左右,波动幅度很小；EYR整体呈下降趋势,从2008年1.25下降至1.22；s稳定在1.25~1.30之间；r整体呈下降趋势,从0.65下降至0.61；n整体呈上升趋势,从0.34上升至0.39；ELR呈逐年上升趋势,从1.83上升至2.21；SDI呈逐年下降趋势,从0.68下降至0.55,5 a平均值为0.59,SDI<1.经分析,5 a间定西市农业生态经济系统辅助能值投入增加,农业现代化水平有所提高,但能值资源利用效率较低且相对稳定,系统承受的环境压力增加,可持续能力下降,属于消费型经济系统.为促进定西市农业的可持续发展,应以保护生态环境为前提,提高对环境资源的开发利用程度,充分利用辅助能值,提高淡水资源利用效率,加大科技投入,提高当地的农业生产水平,提高系统的可利用潜力和可持续发展能力.