文献类型： 外文期刊

作者： Liu, Yuexian ¹ ; Langer, Vibeke ² ; Hogh-Jensen, Henning ³ ; Egelyng, Henrik ⁴ ;

作者机构： 1.Beijing Acad Agr & Forestry, Inst Informat, Beijing, Peoples R China

2.Univ Copenhagen, Fac Life Sci, Dept Agr & Ecol, Taastrup, Denmark

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

4.Danish Inst Int Studies, Copenhagen, Denmark

关键词： energy analysis; energy cost of manure; organic pear; conventional pear; green food certified pear

期刊名称：JOURNAL OF SUSTAINABLE AGRICULTURE （ 影响因子：1.372； 五年影响因子：0.893 ）

ISSN： 1044-0046

年卷期： 2010 年 34 卷 6 期

页码：

收录情况： SCI

摘要： The objective of this study was to evaluate the differences in the energy consumption between the production of certified organic pear, green food certified pear, and conventional pear in two areas in China. Data were collected from interviews with farmers during 2007 and 2008. Energy inputs were significantly higher in organic systems compared with conventional and green systems. Fertilizer was the most important contributor to energy consumption in all three farming systems. Three calculation methods for energy value of manure have been found in the literature: substitution method, by-product method, and thermal method. The choice of various calculation methods for estimating the energy value of manure turns out to have great influence on the results in terms of energy inputs and energy efficiency. Additionally, energy inputs and energy efficiency were also influenced by other agricultural inputs, such as machinery and corresponding fossil fuels, human labor, etc. Possible explanations for these differences are discussed.