| Emergy analysis of agricultural models of straw returning in the central Shaanxi plain |
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| DOI：10.7606/j.issn.1000-7601.2012.06.31 |
| Key Words: straw returning model emergy analysis central Shaanxi plain |
| Author Name | Affiliation | | JIANG Bi | College of Resources and Environment, Northuest A&F University, Yangling, Shaanxi 712100, China | | LI Ming | College of Resources and Environment, Northuest A&F University, Yangling, Shaanxi 712100, China | | WU Xihui | College of Resources and Environment, Northuest A&F University, Yangling, Shaanxi 712100, China | | TONG Xiaogang | College of Resources and Environment, Northuest A&F University, Yangling, Shaanxi 712100, China | | WU Faqi | College of Resources and Environment, Northuest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Crop straws burning or idling not only caused serious air pollution, but also caused a tremendous waste of resources. Therefore the straw recycling research gets more and more attention. Based on the theory and method of emergy analysis of eco-economic system, the emergy flow of 9 different
straw returning models was investigated quantitatively through a series of indexes. The results showed that, input of nonrenewable industrial emergy in all models was the largest contributor to the total emergy inputs, and input of chemical fertilizer emergy had the biggest proportion. Emergy output of wheat
straw and maize crushing and returning(WH-MC) was the highest of 7.60×10 15 sej/(hr2·a). The e-mergy utilization efficiency of the high stubble wheat straw and maize crushing and retuming(WH-MC)was the highest
while the environmental loading ratio was the lowest, and the feedbaek and value to cost ratio were the highest, reaching 2.52%, 1.13%, 75.90% and 1.39 respectively. Therefore, the mode of the high stubble mulch of wheat and corn straw chopping is the optimal model in planting production in this area and should be widely popularized. |
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