小城镇复合生态系统能值整合研究

运用能值理论和方法,以湖北省小城镇(大悟县)为案例,对其复合生态系统进行研究,以了解系统的能流结构和特点,为系统持续发展提供科学指导。研究结果表明,该系统能值自给率68.42%,对外界依赖性低,经济安全性高;但人均能值用量和能值密度较低,系统经济不发达。不可更新资源占能值总用量63.51%,属于资源消耗型的经济模式,环境压力较大,不利于区域可持续发展,今后应增加可更新资源的利用,提高不可更新资源的利用效率,增加科技投入,促进该区域可持续发展。

Emergy synthesis of the complex ecosystem of small town

An emergy synthesis of a small town (Dawu county, Hubei, China) complex ecosystem was performed in order to study its energy flow structure and characteristics, which would provide the scientific guidance for the sustainable development of the system. The results showed that the system emergy self-sufficiency ratio was 68.42%, which represented system had a low dependence on the imported emergy and high economic security. The system was undeveloped because it was low in emergy per area and emergy per person. The ratio of unrenewable resources to total emergy used was 63.51%, which showed the economic development was re- sources depletion mode, environment pressure was higher, and all of these would limit the system susutainable development. Conse- quently, it is necessary to increase the use of renewable resources, improve the efficiency of unrenewable resources, increase the investment on science and technology to facilitate the harmonious development of the system.