Effects of forage composition and growing season on methane emission from sheep in the Inner Mongolia steppe of China
Effects of forage composition and growing season on methane emission from sheep in the Inner Mongolia steppe of China
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DOI：
10.1007/s11284-006-0191-9
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发表时间：
2007-01-01
影响因子：
2
通讯作者：
Glindemann, Thomas
中科院分区：
文献类型：
--
作者：
Wang, Chengjie;Wang, Shiping;Glindemann, Thomas
了解绵羊日粮组成对甲烷（CH 4）产生的影响有助于我们了解草地退化导致的反刍家畜CH 4排放增加及其对放牧生态系统CH 4源/汇的影响。研究了内蒙古草原绵羊7、8月份日粮中不同牧草组成对绵羊甲烷产生的影响。四种饮食处理是：（1）羊草和糙隐子草（LC），（2）羊草、糙隐子草和浓缩物补充（LCC），（3）冷蒿和糙隐子草（AC），和（4）冷蒿、糙隐子草和浓缩物补充（ACC）。甲烷产量显着低于7月比8月（31.4和36.2克每羊单位每天分别）。AC日粮单位消化干物质（DM）、有机物（OM）和中性洗涤纤维（NDF）的日均甲烷产生量分别比LC日粮提高了10.9%、11.2%和42.1%。虽然在AC和LC饮食中添加精料增加了每只羊每天的总CH 4产量，但它提高了绵羊的生产力，并使绵羊消化的每单位DM、OM和NDF的CH 4产量分别降低了14.8%、12.5%和14.8%。我们的研究结果表明，在退化草地CH 4排放量增加，绵羊和精料补充提高饲料利用效率。当放牧率超过0.5羊单位/ha（-1）时，内蒙古草原放牧生态系统似乎是CH 4的一个来源。
Understanding the effects of dietary composition on methane (CH4) production of sheep can help us to understand grassland degradation resulting in an increase of CH4 emission from ruminant livestock and its resulting significance affecting CH4 source/sink in the grazing ecosystem. The objective of this study was to investigate the effect of forage composition in the diet of sheep in July and August on CH4 production by sheep in the Inner Mongolia steppe. The four diet treatments were: (1) Leymus chinensis and Cleistogenes squarrosa (LC), (2) Leymus chinensis, Cleistogenes squarrosa and concentrate supplementation (LCC), (3) Artemisia frigida and Cleistogenes squarrosa (AC), and (4) Artemisia frigida, Cleistogenes squarrosa and concentrate supplementation (ACC). CH4 production was significantly lower in July than in August (31.4 and 36.2 g per sheep-unit per day, respectively). The daily average CH4 production per unit of digestive dry matter (DM), organic matter (OM) and neutral detergent fiber (NDF) increased by 10.9, 11.2 and 42.1% for the AC diet compared with the LC diet, respectively. Although concentrate supplementation in both the AC and LC diets increased total CH4 production per sheep per day, it improved sheep productivity and decreased CH4 production by 14.8, 12.5 and 14.8% per unit of DM, OM and NDF digested by the sheep, respectively. Our results suggested that in degraded grassland CH4 emission from sheep was increased and concentrate supplementation increased diet use efficiency. Sheep-grazing ecosystem seems to be a source of CH4 when the stocking rate is over 0.5 sheep-units ha(-1) during the growing season in the Inner Mongolia steppe.