| 放牧阉牦牛提前出栏甲烷排放强度减排潜力探讨 |
| 摘要点击 1644 全文点击 940 投稿时间：2013-11-28 修订日期：2014-02-18 |
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| 中文关键词 草地畜牧业 低碳经济 甲烷排放强度 CH4减排潜力 牦牛提前出栏 青藏高原 |
| 英文关键词 grassland-based animal husbandry low carbon economy CH4 reduction potential CH4 emission intensity early off-take of yak Tibetan Plateau |
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| 中文摘要 |
| 以阉牦牛提前出栏项目活动为例，按照2006年IPCC国家温室气体清单优良做法指南的计量方法，在同等牧草利用量的前提下，分别对4岁和7岁阉牦牛一生CH4排放总量和单位体重CH4排放量（即排放强度）进行了初步比较分析. 发现在同等牧草利用量的基础上，由于饲养一头7岁阉牦牛一生所消耗的牧草量相当于可饲养2.1头4岁的阉牦牛所消耗的牧草量，所以从CH4排放总量而言，前者一生排放CH4总量比后者少86.3 kg. 然而，由于后者总体重比前者重192 kg，所以，后者的单位体重CH4排放强度（以CH4/体重计）只有0.973 kg·kg-1，而前者为1.374 kg·kg-1. 根据排放强度的概念，在同等牧草消耗量的基础上，如果将一头7岁阉牦牛替代成饲养2.1头4岁的阉牦牛，可以多生产192 kg的活体重，在同样生产192 kg活重的基础上，利用替代法估算后者饲养方式比前者饲养方式可以实现77 kg CH4减排量，即相当于总减排1.6 t CO2当量. 因此，基于排放强度减排而不是总量减排的概念，提前出栏有较大的CH4减排潜力. |
| 英文摘要 |
| The case study preliminarily compared the CH4 reduction potential and CH4 emission intensity of 7 year-old and 4 year-old grazing yak after early off-take practice based on the 2006 IPCC GHG inventory guidelines and under the premise of equal herbage consumption. Our results showed that the total CH4 emission was greater by about 86.3 kg for 2.1 4-year yaks compared with 7 years old yak during their life assuming that their total herbage consumption was the same, because total herbage consumption for a 7-year yak was equal to that of 2.1 4-year yaks. However, CH4 emission per unit body weight (1.374 kg·kg-1) for a 7-year yak (i.e. emission intensity) was higher than that of 2.1 4-year yaks (0.973 kg·kg-1) because total body weight of 2.1 4-year yaks was higher by 192 kg than that of a 7-year yak. According to CH4 emission intensity, change of the early off-take practice from 7-year to 4-year yak could reduce 77 kg CH4 if producing 192 kg body weight through 2.1 4-year yaks compared with a 7-year yak, i.e. reduction potential was about 1600 kg CO2 equivalent under the same consuming forage. Therefore, for grassland-based animal husbandry, early off-take practice for grazing animals had a great reduction potential in the intensity of greenhouse gases (GHGs) emissions per unit output rather than total emissions of GHGs. |
