Method for calculating carbon footprint of cattle feeds – including contribution from soil carbon changes and use of cattle manure
Method for calculating carbon footprint of cattle feeds – including contribution from soil carbon changes and use of cattle manure
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DOI：
10.1016/j.jclepro.2014.02.023
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发表时间：
2014-06
影响因子：
11.1
通讯作者：
L. Mogensen;T. Kristensen;T. L. T. Nguyen-T.-L.-T.-Nguyen-47523653;M. T. Knudsen;J. Hermansen
中科院分区：
文献类型：
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作者：
L. Mogensen;T. Kristensen;T. L. T. Nguyen-T.-L.-T.-Nguyen-47523653;M. T. Knudsen;J. Hermansen
与饲料生产相关的温室气体排放（GHG）是畜牧业生产的热点之一。本文的目的是利用生命周期评估（LCA）来估算奶牛不同饲料的碳足迹。功能单位是“1 千克可供饲喂的饲料干物质 (DM)”。该研究包括在丹麦种植并通常在丹麦养牛场使用的饲料作物。饲料的种植、加工和运输的贡献以及土壤碳（土壤 C）和土地利用变化（LUC）的变化都被包括在内。对于每种饲料作物，都制定了单独的生产计划作为计算碳足迹（CF）的基础。在计算中，所有饲料作物均采用人工肥料施肥，假设使用粪便的环境负担与牲畜生产有关。然而，畜牧系统也因粪便的使用减少了人造肥料的使用量而受到赞扬。因此，建立了粪便处理系统作为牛系统的子系统。该方法允许在平等的基础上对不同饲料作物进行比较。此外，根据土壤碳输入量的估计，估算了土壤碳变化对特定作物的贡献。
Greenhouse gas emissions (GHG) related to feed production is one of the hotspots in livestock production. The aim of this paper was to estimate the carbon footprint of different feedstuffs for dairy cattle using life cycle assessment (LCA). The functional unit was ‘1 kg dry matter (DM) of feed ready to feed’. Included in the study were fodder crops that are grown in Denmark and typically used on Danish cattle farms. The contributions from the growing, processing and transport of feedstuffs were included, as were the changes in soil carbon (soil C) and from land use change (LUC). For each fodder crop, an individual production scheme was set up as the basis for calculating the carbon footprint (CF). In the calculations, all fodder crops were fertilized by artificial fertilizer based on the assumption that the environmental burden of using manure is related to the livestock production. However, the livestock system is also credited for the fact that the use of manure reduces the amount of artificial fertilizer being used. Consequently, a manure handling system was set up as a subsystem to the cattle system. This method allowed a comparison between different fodder crops on an equal basis. Furthermore, the crop-specific contribution from changes in soil C was estimated based on estimated amounts of C input to the soil.