关键词: 能值, 农业系统, 资源, 福建省

Abstract:

Based on emergy theory，the emergy input and output of agricultural system were analyzed in Fujian Province during the period from 1981 to 2004.The nine emergy indices analyzed are emergy density (ED)，emergy dollar ratio (EDR)，emergy yield ratio (EYR)，emergy production ratio (EPR)，emergy investment ratio (EIR)，environmental carrying capacity (ECC)，emergy sustainable index (ESI)，system dominant degree (SDD) and system stability degree (SSD).The total emergy input and total emergy output increased during the 24 year period；the ED，EIR，EPBR，SDD，ECC increased continuously，indicating that the economic exploitive degree of the agriculture system raised continuously and the productive benefit far exceeded the mean level in the world.The agricultural products in this region had obvious advantages in terms of price，and the structure of agricultural system was optimized；but this may also indicate a pressure on the environmental resources.EDR and ESI decreased continuously，SSD decreased a little，indicating that the sustainability and stability of the agricultural system decreased due to the increase of the exploitive intensity and the exploitive degree in the agricultural system.Comparing all the emergy indices with other regions，it is found that the agricultural producing environmental resource condition was a lot more superior in Fujian Province，and its producing environment is still in a good condition.

Key words: emergy, agricultural system, resources, Fujian Province