Coupling life-cycle assessment and the RothC model to estimate the carbon footprint of green manure-based wheat production in China

文献类型： 外文期刊

第一作者： Yao, Zhiyuan

作者： Yao, Zhiyuan;Zhang, Dabin;Yao, Pengwei;Liu, Na;Zhai, Bingnian;Huang, Donglin;Gao, Yajun;Zhao, Na;Zhang, Suiqi;Li, Yangyang;Cao, Weidong;Zhang, Dabin;Zhai, Bingnian;Huang, Donglin;Gao, Yajun

作者机构：

关键词： Leguminous green manure;Greenhouse gas emissions;Wheat yield;Process-oriented model;Carbon sequestration;GHG profile

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Abstract Reducing the carbon footprint (CF) of crop production is an efficient way to mitigate climate change. Growing legume green manure (LGM) instead of summer fallow may achieve this goal by lowering synthetic nitrogen (N) fertilizer needs and replenishing the depleted soil carbon (C) pool. The Rothamsted Carbon (RothC) model was incorporated into the Life-Cycle Assessment (LCA) to evaluate the present and projected CFs of green manure-based wheat production systems in dryland agriculture on the Loess Plateau of China. The field study included four main treatments (Huai bean, soybean and mung bean grown as green manure in summer and fallow as control) and four synthetic N rates (0, 108, 135 and 162kgNha?1) applied at wheat sowing. Soybean as LGM increased averaged wheat yield over 4 synthetic N rates by 8% compared with fallow (P <0.05), and synthetic N requirement was reduced by 33% without compromising the wheat yield for all the main treatments. Although LGM treatments had higher greenhouse gas (GHG) emissions from agricultural inputs, the greater amount of C inputs elevated the corresponding SOC stocks (SOCS) by 14–24% after 8years, thus significantly reducing the CF by 25–51% compared with fallow. The modelled SOCS equilibrium indicates that the CF for cropping systems with LGM will be 53–62% lower than fallow and 23–37% lower compared with their current level. In conclusion, introducing legume green manure instead of summer fallow is a highly efficient measure for persistent CF reduction, and coupling the RothC model and LCA is an alternative method to predict the long-term impact of different cropping systems on GHG emissions. Graphical abstract Display Omitted Highlights ? Synthetic N can be reduced by 33% while keep wheat yield for the 4 main treatments. ? Legume green manure is efficient in increasing SOC. ? Coupling life-cycle assessment and the RothC can evaluate future CF. ? Legume green manure

分类号： X1

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