%0 Journal Article
%T Using emergy to analysis agro-ecosystem sustainability in the edge-regions of Qinghai-Tibet Plateau——A case study of Tibetan and Qiang Autonomous Perfecture of Aba,Sichuan Province<br>基于能值的青藏高原边缘区域农业生态系统可持续发展分析——以四川省阿坝藏族羌族自治州为例
%A WEI Fen-Zi
%A YUE Min
%A <br>魏奋子
%A 岳 敏
%J 中国生态农业学报
%D 2009
%I 
%X Quantitative analysis and evaluation of the agro-ecosystem of Aba, Sichuan Province, were conducted on the basis of emergy theory. Based on the results, there is an increase in total emergy input from 1.126 × 1022 to 1.661 × 1022 sej·a-1, with an observed increase in total emergy output from 5.002 × 1020 to 1.383 × 1022 sej·a-1 for 1952 ~ 2005. Ecological function potential drops from 54.08% to 37.02% and the basic population capacity increases from 199 400 to 315 100. Emergy self-support ratio drops from 74.58% to 54.13%, while emergy investment ratio increases from 34.0% to 85.0%. Emergy density increases from 1.34 × 1011 to 1.97 × 1011 sej·m-2 and emergy/money ratio decreases from 4.93 × 1014 to 1.81 × 1013 sej·$-1. There is an increase in environment load ratio and net energy yield ratio from 0.85 to 1.70 and from 0.18 to 1.82 respectively. Sustainable development index increases from 0.20 to 1.07. The results therefore indicate a continuous increase in agro-ecosystem production efficiency in Aba. Eco-tourism plays an important role in the development of the system. However, an unsustainability risk of the system exists due to insufficient input of industry-assisted emergy and over-consumption of natural resources. From the discussions above, it is important that sustainable development agro-ecosystem should be promoted in Aba.
%K Emergy
%K Agro-ecosystem
%K Sustainable development
%K Aba of Sichuan Province
%K Edge-region of Qinghai-Tibet Plateau<br>能值理论
%K 农业生态系统
%K 可持续发展
%K 四川省阿坝州
%K 青藏高原边缘区
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=AB3ABF502E2E1FF39F0E3B80164C9031&aid=E295F6B11BEDDA8A7EE58E3D3D703D01&yid=DE12191FBD62783C&vid=BCA2697F357F2001&iid=38B194292C032A66&sid=28B3EB92D5061EA4&eid=D5970ECA7D10A7B1&journal_id=1671-3990&journal_name=中国生态农业学报&referenced_num=3&reference_num=14