Greenhouse gas emissions from conventional and organic cropping systems in Spain. I. Herbaceous crops
Greenhouse gas emissions from conventional and organic cropping systems in Spain. I. Herbaceous crops
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DOI：
10.1007/s13593-014-0267-9
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发表时间：
2015-04-01
影响因子：
7.3
通讯作者：
Alonso, Antonio
中科院分区：
文献类型：
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作者：
Aguilera, Eduardo;Guzman, Gloria;Alonso, Antonio
农业是气候变化的主要驱动力，特别是在考虑到所有间接排放源的情况下。针对某一过程的缓解方案常常被提出，而忽视了它们对整体温室气体平衡的次要影响。综合方法，如生命周期评估(LCA)，经常在没有根据特定场地特征调整排放系数的情况下应用。在这里，我们使用LCA计算了西班牙38对有机和常规草本种植制度和产品的全球变暖潜力。农作物产品包括雨后谷物和豆类、大米、露天蔬菜和温室蔬菜。我们使用了来自农民访谈和公布的转换系数的数据。我们的结果表明，排放平衡主要是化石燃料的使用，而不是直接的田间排放。有机管理减少了36-65%的作物排放，除了水稻由于产生甲烷而增加了8%。有机作物以产品为基础的排放量也平均降低了30%，大米除外。
Agriculture is a major driver of climate change, particularly when all indirect emission sources are accounted for. Mitigation options targeted on one process are often proposed, ignoring their secondary effects on the overall greenhouse gas balance. Integrative methodologies such as life cycle assessment (LCA) are often applied without adjusting emission factors to specific site characteristics. Here, we used LCA to calculate the global warming potential of 38 pairs of organic and conventional herbaceous cropping systems and products in Spain. Crop products included rainfed cereals and pulses, rice, open-air vegetables, and greenhouse vegetables. We used data from farmer interviews and published conversion factors. Our results show that the emission balances were dominated by fossil fuel use rather than by direct field emissions. Organic management reduced crop emissions by 36-65 %, with the exception of rice showing an increase of 8 % due to methane generation. Product-based emissions of organic crops were also lower by 30 % on average, except for rice.