| Evaluation of sustainable utilization of cultivated land in Yulin based on emergy theory |
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| DOI：10.7606/j.issn.1000-7601.2012.03.39 |
| Key Words: cultivated land Yulin area emergy algebra emergy
indicators sustainable development |
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| Abstract: |
| Emergy analysis was used to analyze cultivated land in Yulin area for the period from 2003-2007. The results showed that the total emergy input in these years was stable, among which the purchased emergy was increasing and the nonrenewable resources were decreasing, the purchased emergy occupied the frst place and the nonrenewable re-sources took the second from 2004. The analysis of the emergy indicators showed that the development of the study area depended mostly on the input of natural resources. Comparison and analysis of different areas showed that there Were some problems for the cultivated land in Yulin area, for example, mechanization level and development level were low, and the development depended too mueh on the input of natural resources. Thus, improving purchased emergy appropri-ately and developing organic agriculture are suggested for the sustainable development of the agro-ecosystem in Yulin area. |
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