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Enteric methane emissions from German dairy cows

机译:德国奶牛的肠甲烷排放

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摘要

Up to now, the German agricultural emission inventory used a model for the assessment of methane emissions from enteric fermentation that combined an estimate of the energy and feed requirements as a function of performance parameters and diet composition, with the constant methane conversion rate provided in the IPCC guidelines. The two existing guidelines propose two different constant rates (IPCC, 1996: 6.0 % or 60 kJ MJ(-1), and IPCC, 2006: 6.5 % or 65 kJ MJ(-1), of the gross energy intake, respectively). Both constants do not reflect that the rates should be dependent on feed properties, as stated by IPCC. A methane emission model was selected here that is based on German feed data. It was combined with the hitherto applied model describing energy requirements. The emission rates thus calculated deviate from those previously obtained. In the new model, the methane conversion rate is back-calculated from emission rates and gross energy intake rates. For German conditions of animal performance and diet composition, the national means of methane conversion rates range between 71 kJ MJ(-1) and 61 kJ MJ~(-1) for low and high performances (4700 kg animal(-1) a(-1) in 1990 to 7200 kg animal(-1) a(-1) in 2010), respectively.
机译:到目前为止,德国农业排放清单使用了一个模型来评估肠发酵产生的甲烷,该模型结合了能量和饲料需求的估算值,这些能量和饲料需求是性能参数和日粮组成的函数,而甲烷的恒定转化率是IPCC指南。现有的两个指南提出了两种不同的恒定能量消耗率(IPCC,1996:6.0%或60 kJ MJ(-1),IPCC,2006:6.5%或65 kJ MJ(-1),分别占总能量摄入量)。如IPCC所述,两个常数均未反映出速率应取决于饲料性质。在此基于德国饲料数据选择了甲烷排放模型。它与迄今为止描述能源需求的应用模型相结合。这样计算出的排放率与先前获得的排放率有出入。在新模型中,甲烷转化率是根据排放率和总能量摄入率反算的。对于德国的动物性能和日粮组成条件,低水平和高性能动物(4700千克动物(-1)a()的全国甲烷转化率平均值在71 kJ MJ(-1)和61 kJ MJ〜(-1)之间。 -1)在1990年达到7200公斤动物(-1)a(-1)在2010年)。

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