DOI: 10.1111/gcb.13868
Scopus记录号: 2-s2.0-85030126547
论文题名: Climate mitigation by dairy intensification depends on intensive use of spared grassland
作者: Styles D. ; Gonzalez-Mejia A. ; Moorby J. ; Foskolos A. ; Gibbons J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 2 起始页码: 681
结束页码: 693
语种: 英语
英文关键词: agriculture
; climate change
; consequential life cycle assessment
; land sparing
; life cycle assessment
; sustainable intensification
Scopus关键词: agricultural intensification
; alternative agriculture
; carbon footprint
; cattle
; climate change
; climate effect
; crop production
; dairy farming
; emission inventory
; grassland
; greenhouse gas
; life cycle analysis
; Brazil
; United Kingdom
; Animalia
; Bos
; Zea mays
英文摘要: Milk and beef production cause 9% of global greenhouse gas (GHG) emissions. Previous life cycle assessment (LCA) studies have shown that dairy intensification reduces the carbon footprint of milk by increasing animal productivity and feed conversion efficiency. None of these studies simultaneously evaluated indirect GHG effects incurred via teleconnections with expansion of feed crop production and replacement suckler-beef production. We applied consequential LCA to incorporate these effects into GHG mitigation calculations for intensification scenarios among grazing-based dairy farms in an industrialized country (UK), in which milk production shifts from average to intensive farm typologies, involving higher milk yields per cow and more maize and concentrate feed in cattle diets. Attributional LCA indicated a reduction of up to 0.10 kg CO2e kg−1 milk following intensification, reflecting improved feed conversion efficiency. However, consequential LCA indicated that land use change associated with increased demand for maize and concentrate feed, plus additional suckler-beef production to replace reduced dairy-beef output, significantly increased GHG emissions following intensification. International displacement of replacement suckler-beef production to the “global beef frontier” in Brazil resulted in small GHG savings for the UK GHG inventory, but contributed to a net increase in international GHG emissions equivalent to 0.63 kg CO2e kg−1 milk. Use of spared dairy grassland for intensive beef production can lead to net GHG mitigation by replacing extensive beef production, enabling afforestation on larger areas of lower quality grassland, or by avoiding expansion of international (Brazilian) beef production. We recommend that LCA boundaries are expanded when evaluating livestock intensification pathways, to avoid potentially misleading conclusions being drawn from “snapshot” carbon footprints. We conclude that dairy intensification in industrialized countries can lead to significant international carbon leakage, and only achieves GHG mitigation when spared dairy grassland is used to intensify beef production, freeing up larger areas for afforestation. © 2017 The Authors. Global Change Biology Published by John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110550
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: School of Environment, Natural Resources & Geography, Bangor University, Bangor, United Kingdom; IBERS, Aberystwyth University, Aberystwyth, United Kingdom
Recommended Citation:
Styles D.,Gonzalez-Mejia A.,Moorby J.,et al. Climate mitigation by dairy intensification depends on intensive use of spared grassland[J]. Global Change Biology,2018-01-01,24(2)