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青藏高原高寒牧区冷季补饲藏系绵羊温室气体排放特征

DOI: 10.11654/jaes.2014.10.027, PP. 2071-2076

Keywords: 藏系绵羊,温室气体,甲烷,二氧化碳,氧化亚氮,日排放特征

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Abstract:

为了揭示藏系绵羊温室气体排放特征,在青藏高原高寒牧区采用密封式呼吸箱-气相色谱结合的方法,于2013年冷季对3只身体健康、均重(50.13±1.28)kg的藏系绵羊温室气体(CH4、CO2、N2O)日排放特征进行了研究。试验期间,动物日粮的精料为蒸煮饲料,粗粮为青干草饼。结果表明,藏系绵羊的CH4排放日动态具有明显规律性,排放峰值在8:00和17:00(P<0.01),排放峰值的出现时间与饲喂时间基本吻合,最小值出现在次日7:00;CO2的日排放曲线相对平稳;N2O的日变化没有明显规律且排放量极低。在冷季补饲模式下,藏系绵羊的CH4、CO2和N2O日排放量分别为(16.17±1.27)、(549.18±20.63)g·head-1和(0.73±0.32)mg·head-1.

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