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首页> 外文期刊>The Science of the Total Environment >Carbon footprint of main crop production in China: Magnitude, spatial-temporal pattern and attribution
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Carbon footprint of main crop production in China: Magnitude, spatial-temporal pattern and attribution

机译：中国主要农作物的碳足迹：量级，时空格局和归因

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Agricultural management practices that increase carbon (C) sequestration and reduce greenhouse gas (GHG) emissions have been identified as attractive mitigation strategies. In this study, we evaluated the spatial-temporal dynamics of carbon footprints (CFs) in China and their driving factors aimed to analyze potential mitigation strategies. Our CF data comprised the GHG emissions and C sequestration of main crop production. The results indicated that from 2000 to 2015, the GHG emissions of main crop production reached 133.3 Tg CO2-C equivalents (Ce) year(-1) and the soil C sequestration was 25.3 Tg Ce year(-1), resulting in a CF of 108.0 Tg Ce year(-1). In addition, the CF increased by only 1.9%, and 90.9% of the increase in GHG emissions was offset by C sequestration from straw return and fertilization. Moreover, the farm CF (FCF) and product CF (PCF) decreased by 9.7% and 30.4%, respectively, because the proportion of cropland practicing straw return increased by 26.4% and the improved efficiency of fertilization resulting from decrease in fertilizer use of 8 kg nitrogen (N) ha(-1) year(-1). At the regional scale, GHG emissions increased by 9.1-65.0%, and the primary drivers underlying this change were fertilization, machinery operation and rice paddy CH4 flux in the northeast-northwest, north and south, respectively. However, the PCF decreased by 15.0-47.0% as soil C sequestration increased because of the decreased use of fertilizer and the implementation of straw return. The expansion of straw return and promotion of fertilization efficiency significantly mitigated 25.3 Tg Ce year(-1) emissions, indicating that these measures are important mitigation strategies and should be implemented specifically in different regions combined with other management practices. Our study provided a comprehensive method of calculating the CF of croplands and its driving factors in China and indicated potential mitigation strategies that would benefit policy selection for reduced emissions without influencing crop yields. (c) 2018 Elsevier B.V. All rights reserved.
机译：增加碳（C）固存并减少温室气体（GHG）排放的农业管理实践已被认为是有吸引力的缓解策略。在这项研究中，我们评估了中国碳足迹（CFs）的时空动态及其驱动因素，旨在分析潜在的缓解策略。我们的CF数据包括主要农作物的温室气体排放和碳固存。结果表明，从2000年到2015年，主要农作物的温室气体排放量达到133.3 Tg CO2-C当量（Ce）年（-1），土壤固碳量为25.3 Tg Ce年（-1），从而形成了CF 108.0 Tg Ce年（-1）。此外，CF仅增加了1.9％，GHG排放增加量的90.9％被秸秆还田和施肥中的C固存所抵消。此外，农场的CF（FCF）和产品CF（PCF）分别下降了9.7％和30.4％，这是因为耕作秸秆还田的农田比例增加了26.4％，肥料使用量减少导致施肥效率提高了8 kg氮（N）ha（-1）年（-1）。在区域范围内，温室气体排放量增加了9.1-65.0％，促成这一变化的主要驱动力分别是东北，西北，北部和南部的施肥，机械操作和稻田CH4通量。但是，由于减少了肥料的使用和秸秆还田，土壤固碳增加，PCF下降了15.0-47.0％。秸秆还田的扩大和施肥效率的提高大大减轻了25.3 Tg Ce year（-1）的排放，表明这些措施是重要的缓解策略，应结合其他管理措施在不同地区专门实施。我们的研究提供了一种全面的方法来计算中国耕地的CF及其驱动因素，并指出了潜在的缓解策略，这将有利于政策选择，以减少排放而又不影响作物产量。 （c）2018 Elsevier B.V.保留所有权利。

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