%0 Journal Article
%T Emergy evaluation on the sustainability of cropping-grazing system in economic belt on northern slope of Tianshan Mountains<br>基于能值的天山北坡经济带农牧系统可持续性评估
%A ZHANG Yu-fang
%A DONG Xiao-bin
%A YAN Mao-chao
%A ZHANG Xin-shi
%A <br>张玉芳
%A 董孝斌
%A 严茂超
%A 张新时
%J 生态学杂志
%D 2007
%I 
%X By the methods of emergy analysis,this paper evaluated the eco-economic system of cropping-grazing in the economic belt on northern slope of Tianshan Mountains.A suit of emergy indices was adopted to quantitatively assess the emergy flows.The results showed that environmental resources made a great contribution to the cropping-grazing system.The emergy of environmental resources occupied 79.2% of the total,and the net emergy yield rate was 4.81,which were much higher than the mean values(13% and 0.27)of the whole nation and illustrated that the cropping-grazing system in this area possessed a certain competitive advantage in its production.The macroeconomic value of the cropping-grazing products was much higher than their market value,due to the large input of 'free'resources from the environment to the cropping-grazing production.The value of environmental loading rate was 0.373,which was far below the national average of 2.8 and indicated a less pressure on the environment.The emergy sustainability index was 12.90,showing a good development potential of this system.Some measures about the industrial structure adjustment were proposed for promoting the sustainable development of regional agriculture.
%K emergy
%K economic belt on the northern slope of Tianshan Mountains
%K sustainability evaluation of cropping-grazing system<br>能值
%K 天山北坡经济带
%K 农牧业系统可持续性评估
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=B04840A985D251F36078BD07A90EF003&aid=3477C24EE39EC19F65733402C58EEDED&yid=A732AF04DDA03BB3&vid=96C778EE049EE47D&iid=708DD6B15D2464E8&sid=8080149E52358D01&eid=DDDE8AA7C661A4B3&journal_id=1000-4890&journal_name=生态学杂志&referenced_num=0&reference_num=15