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Energy efficiency of organic pear production in greenhouses in China

文献类型: 外文期刊

作者: Liu, Yuexian 1 ; Hogh-Jensen, Henning 3 ; Egelyng, Henrik 4 ; Langer, Vibeke 1 ;

作者机构: 1.Univ Copenhagen, Fac Life Sci, Dept Agr & Ecol, DK-2630 Taastrup, Denmark

2.Beijing Acad Agr & Forestry, Inst Informat, Beijing 100094, Peoples R China

3.Aarhus Univ, Natl Environm Res Inst, Dept Policy Anal, DK-4000 Roskilde, Denmark

4.Danish Inst Int Studies, DK-1401 Copenhagen, Denmark

关键词: organic pear; energy efficiency; economic analysis; greenhouse

期刊名称:RENEWABLE AGRICULTURE AND FOOD SYSTEMS ( 影响因子:2.657; 五年影响因子:2.922 )

ISSN: 1742-1705

年卷期: 2010 年 25 卷 3 期

页码:

收录情况: SCI

摘要: The development of organic protected cultivation taking place in densely populated areas has raised the question whether it is an environmentally friendly production system. The present study investigated energy consumption of organic pear production in two production systems, namely in traditional Chinese solar greenhouses and in the open field. In both production systems, energy output/input ratio and energy productivity were used as indicators to determine the energy efficiency; yield, cost of production, net economic return per land area unit and benefit/cost ratio were used to evaluate economic productivity. The analysis results indicated that energy input and energy output per land area unit in the solar greenhouse were higher than in the open field; whereas energy efficiency in terms of output/input ratio and energy productivity were lower in the solar greenhouse than those in the open field. However, if energy input sequestered in the protected structure was excluded in the solar greenhouse production system, energy efficiency was higher in the greenhouse system than in the open-field system. Our analysis further showed that the economic costs, the yield, cost of production, gross product value and net income per land area unit in the greenhouse were more than twice as high as those in the open field due to a higher tree density and a premium price. However, the production taking place in the open field used a great share of renewable energy and higher energy efficiency, which may comply more with the principles of organic farming than the greenhouse production system.

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