Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, H3G 1M8, Canada.
Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, H3G 1M8, Canada.
J Environ Manage. 2020 Jun 15;264:110443. doi: 10.1016/j.jenvman.2020.110443. Epub 2020 Mar 25.
The beef cattle production has been considered as one of the largest sources of greenhouse gases (GHGs) emission. A large amount of GHGs including NO and CH from enteric fermentation and manure are discharged to atmosphere during beef-production process. In addition, a substantial amount of GHGs is also emitted from many other related processes such as feed production, transportation, and energy consumption. In this study, an emission assessment model was developed to quantify the amount of regional GHGs produced from the beef cattle production process. A case study was conducted based on the beef production in Saskatchewan, Canada. The results demonstrated that the GHG emissions from the annual marketed beef cattle in Saskatchewan in 2014 were 8.52 × 10 kg CO-eq in total and the cattle-source GHGs (enteric CH, manure CH, and manure NO emission) accounted for more than 90% of the total emission. Sensitivity analysis showed that the most critical factors influencing the GHG emission included feedlot manure handling system, cattle diet, feed additives, maximum methane producing capacity (B), and climate (temperature, precipitation, and potential evapotranspiration). The potential impacts of climate change on GHG emission from beef cattle production in Saskatchewan were also investigated. An overall decrease in the GHG emission can be observed due to the climate change, which are 3.67%, 4.96%, and 6.63% for 2020-2039, 2040-2059, and 2060-2099, respectively.
肉牛生产被认为是温室气体（GHG）排放的最大来源之一。在肉牛生产过程中，大量的 GHG 包括肠道发酵和粪便中的 NO 和 CH 被排放到大气中。此外，大量的 GHG 也会从饲料生产、运输和能源消耗等许多其他相关过程中排放出来。在本研究中，开发了一种排放评估模型来量化肉牛生产过程中产生的区域 GHG 量。基于加拿大萨斯喀彻温省的肉牛生产进行了案例研究。结果表明，2014 年萨斯喀彻温省上市肉牛的 GHG 排放量总计为 8.52×10kg CO-eq，牛源 GHG（肠道 CH、粪便 CH 和粪便 NO 排放）占总排放量的 90%以上。敏感性分析表明，影响 GHG 排放的最关键因素包括饲养场粪便处理系统、牛的饮食、饲料添加剂、最大甲烷产生能力（B）和气候（温度、降水和潜在蒸散量）。还研究了气候变化对萨斯喀彻温省肉牛生产 GHG 排放的潜在影响。由于气候变化，GHG 排放量总体呈下降趋势，分别为 2020-2039 年、2040-2059 年和 2060-2099 年的 3.67%、4.96%和 6.63%。
