黄土高原中南部农户农果复合生态系统的能值分析

应用生态经济系统能值分析理论与方法,以黄土高原中南部的延安市宝塔区北沟村、淳化县西坡村2村农户为研究对象,通过一系列能值指标,定量分析了农户农果复合生态系统的自然资源以及系统投入产出特征.结果表明:农户农果复生态系统的能值投入结构相似,辅助能的投入中不可更新工业能的投入比重最高,且以化肥投入为主,有机肥投入不足,应按适当比例增加有机能值的投入以提高系统的生态经济效益;农户农果复合生态系统生产优势度较高,但系统稳定性指教低,单位时间的劳动生产率较低,农果业生产水平有待提高;农户农果复合系统的能值产出率较低,能值投入率较高,对能源的利用效率较低,农果复合系统的环境资源进一步开发的潜力很大.提高农果复合系统的能值投入应当是提高资源的利用效率,加强农果业管理的科技含量和科学管理力度,使黄土高原中南部的果业生产走上健康持续发展的轨道.

Emergy analysis of peasant household crop-fruit ecosystem in middle and south Loess Plateau

Based on the theory of emergy analysis,taking some peasant households in two villages in the middle and south Loess Plateau respectively as test objects,the energy flow of crop-friut ecosystem was investigated quantitatively.The result showed that the structure of both village's energy system input was similar and the investment of chemical fertilizers made up the largest proportion, while the investment of organic manure was deficient.The net output of crop-fruit ecological system was low and needed to be increased.The environment loading rate was not high as a whole,so attention should be paid to increasing utilization efficiency of renewable environmental resources.The focal point of energy input for crop-fruit ecological system was to raise the level of crop-fruit industry technology and to improve crop-fruit production condition so as to achieve sustainable development of crop-fruit ecological system.