基于能值分析的红壤侵蚀区农业循环经济研究

Study on the Agricultural Circular Economy in Eroded Red Soil Region Based on Emergy Analysis

为探究农业循环经济在土壤侵蚀区的适应性与发展潜力,选取福建省长汀县典型农户循环经济(模式Ⅰ)及传统类型(模式Ⅱ)进行能值流动比较,并运用净能值产出率(EYR)、能值投资率(EIR)环境负载率(ELR)、可持续性发展指数(ESI)、能值投入密度及能值反馈率指标进行评价.结果表明:模式Ⅰ的EYR、EIR、ELR分别是模式Ⅱ的4.15倍、1.13倍和0.15倍,模式Ⅰ经济发展程度相对较高,对环境的依赖相对较弱;从可持续性指数方面可得出,模式Ⅰ与模式Ⅱ的能值ESI分别为6.85,0.26,表明模式Ⅰ具有活力与发展潜力,模式Ⅱ属于消费型经济系统,不具有可持续性;模式Ⅰ的能值投入密度为1.90E+12 sej,高于模式Ⅱ的1.66E+12 sej,模式Ⅰ开发程度和集约化程度比模式Ⅱ高,结构较为合理;模式Ⅰ能值反馈率为4.3%,具有一定的主动调节、组织能力.因此总体上说,红壤侵蚀区循环经济模式具有更高的经济效益和环境效益,可推动当地农户可持续发展.

To explore the adaptability and development potentiality of agricultural circular economy in eroded red soil region, selecting typical rural household-agricultural circular economy （ model I ） and traditional pattern （ model II ） in Changting County of southwestern Fujian Province to compare their emergy value flows, the index including emergy yield ratio （EYR）, emergy investment ratio （EIR）, environmental load rate （ELR）, sustainable development index （ESI）, emergy value feedback rate were applicable to evaluated. The results showed that in modal I , EYR, EIR and ELR were as 4. 15 times, 1.13 times and 0. 15 times as model II , and there were a higher degree of economic development and weaker environmental dependence in model I. Respect to the sustainable factors, the sustainable development index （ESI） in model I and mode II were 6. 85 and 0. 26, it indicated that the more vitality and development potential of model I , model II belongs to the consumer oriented economic system, it has no sustainability. The emergy density of model I （ 1.90E ＋ 12 sej） was also higher than model II （ 1.66E ＋ 12 sej）, which indicated that model I had a higher intensification level and more reasonable structure than model II.The feedback rate of model I was 4.3%, ensuring certain ability of the circular economy in eroded red soil region had higher economic which impulsing local rural household sustainable development. self-adjustment. So, totally,the circular economy in eroded red soil region had higher economic and environmental benefits, which impulsing local rural household sustainable development.