期刊
JOURNAL OF DAIRY SCIENCE
卷 96, 期 2, 页码 857-865出版社
ELSEVIER SCIENCE INC
DOI: 10.3168/jds.2012-5904
关键词
carbon footprint; life cycle assessment; white clover; milk production
资金
- Department of Agriculture and Food Research Stimulus Fund Programme [RSF07-516]
- Irish Government National Development Plan
- European Research and Development Fund (ERDF)
Carbon footprint (CF) calculated by life cycle assessment (LCA) was used to compare greenhouse gas emissions from pasture-based milk production relying mainly on (1) fertilizer N (FN), or (2) white clover (WC). Data were sourced from studies conducted at Solohead Research Farm in Ireland between 2001 and 2006. Ten FN pastures stocked between 2.0 and 2.5 livestock units (LU)/ha with fertilizer N input between 180 and 353 kg/ha were compared with 6 WC pastures stocked between 1.75 and 2.2 LU/ha with fertilizer N input between 80 and 99 kg/ha. The WC-based system had 11 to 23% lower CF compared with FN (average CF was 0.86 to 0.87 and 0.97 to 1.13 kg of CO2-eq/kg of energy-corrected milk, respectively, 91% economic allocation). Emissions of both N2O and CO2 were lower in WC, whereas emissions of CH4 (per kg of energy-corrected milk) were similar in both systems. Ratio sensitivity analysis indicated that the difference was not caused by error due to modeling assumptions. Replacing fertilizer N by biological nitrogen fixation could lower the CF of pasture-based milk production.
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