JOURNAL OF NATURAL RESOURCES ›› 2007, Vol. 22 ›› Issue (4): 507-515.doi: 10.11849/zrzyxb.2007.04.002

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

Emergy Analysis of the Eco-economic Systems of West Jilin Province According to the Resource and Environment Gradient

WANG Ming-quan1,2, WANG Jin-da1, LIU Jing-shuang1   

  1. 1. Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun 130012, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2006-12-26 Online:2007-08-25 Published:2007-08-25

Abstract: On the basis of emergy method,this paper chose four regions in west Jilin province,Changling,Qian’an,Da’an and Zhenlai from southeast to northwest,to make a contrasting analysis of the eco-economical dynamics according to resource and environment gradient.The results indicated that the emergy indices were varying noticeably between the study sites.1)Stability of the systems.Agro-ecosystem functions here fluctuated obviously with rainfall,but Changling and Qian’an had a relatively more stable agriculture than that in Zhenlai and Da’an.Benefited from the stability,there was an increasing trend of emergy density(ED)and emergy investment ratio(EIR)from Zhenlai to Changling.Correspondingly,from 1989 to 2001 Changling enabled the largest scale-up of emergy harvest and emergy accumulation of all,followed by Qian’an,Da’an and Zhenlai.2)Emergy yield structures.Though experienced a declining proportion,crop still contributed most to the total emergy harvest in Changling and Qian’an.As to Zhenlai and Da’an,stockbreeding have played a dominating role in recent years since the crop yield suffered heavy consequences of rainfall scarcity.As a whole,the average emergy yield ratio(EYR)appeared to be Changling(1.89)Qian’an>Da’an>Zhenlai while environmental sustainability index(ESI)varied oppositely.It was higher economic stress that led weak sustainability of the agro-ecosystems in Changling and Qian’an,but Da’an and Zhenlai had a lower level and more unstable economy mainly for the reason of resource scarcity.4)Based on what mentioned above it could be concluded that natural resources and environmental conditions,especially rainfall,was of great significance to the well-run of eco-economic system in west Jilin province.

Key words: ecotone between agriculture and animal husbandry, eco-economic system, emergy analysis, fluctuation, west Jilin province

CLC Number: 

  • Q148