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Carbon footprint assessment for irrigated and rainfed maize (Zea mays L.) production on the Loess Plateau of China

文献类型： 外文期刊

作者： Zhang, Wushuai 1 ; He, Xiaoming 1 ; Zhang, Zhongdong 2 ; Gong, Shuai 2 ; Zhang, Qiang 3 ; Zhang, Wei 1 ; Liu, Dunyi 1 ; Z 1 ;

作者机构： 1.China Agr Univ, Minist Educ, Key Lab Plant Soil Interact, Coll Resources & Environm Sci,Ctr Resources Envir, Beijing 100193, Peoples R China

2.Shanxi Acad Agr Sci, Inst Maize, Xinzhou 034000, Peoples R China

3.Shanxi Acad Agr Sci, Inst Agr Environm &

关键词： GHG emission;Carbon footprint;Yield;Life cycle assessment;Mitigation potential

期刊名称：BIOSYSTEMS ENGINEERING （ 影响因子：4.123； 五年影响因子：4.508 ）

ISSN： 1537-5110

年卷期： 2018 年 167 卷

页码：

收录情况： SCI

摘要： Although irrigation increases maize yield, its environmental costs, especially those associated with greenhouse gas (GHG) emissions, remain unclear. This study evaluated the differences and mitigated potentials of carbon footprint in irrigated and rainfed maize systems, based on a survey of 120 farmers and a life cycle assessment (LCA). The results indicated that the GHG emission of irrigated system was 5.33 Mg CO2 eq ha(-1), 40% higher than that in rainfed system, mainly due to the increased consumption of electricity and increased fertiliser application (especially nitrogen). However, the average yield in irrigated system was 10.0 Mg ha(-1), 2.1 times that of rainfed system (4.7 Mg ha (1)), and therefore the carbon footprint was lower by 37%. Fertiliser production, transportation and application contributed 85-95% to the carbon footprint in rainfed system and 79-86% in irrigated system, while the electricity used for irrigation accounted for 9-16% of the carbon footprint in irrigated system. Grouping assessment found that higher yield and lower carbon footprint existed in win win group in both systems. In addition, scenario analysis shows that the carbon footprint could be reduced to 362 kg CO2 eq Mg-1 for rainfed system and to 285 kg CO2 eq Mg-1 for irrigated system by optimising crop, fertiliser, and water management. In conclusion, the irrigated system could produce more grain with a lower carbon footprint even though it required more energy, water and fertilisers in this study. And the carbon footprint could be further cut down through optimised integrative management in both rainfed and irrigated systems. (C) 2017 IAgrE. Published by Elsevier Ltd. All rights reserved.

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