【摘要】 运用密闭呼吸代谢箱系统,对3只舍饲绵羊24h(有间断)甲烷(CH4)和二氧化碳(CO2)日排放特征进行了研究。供试3只甘肃细毛羊体况相近(平均体重为(25±5)kg),其基础日粮为燕麦干草和玉米精料,粗精比为6∶4。结果表明:供试绵羊CH4和CO2的平均排放量分别为11g/d和147 g/d,CH4排放的峰值分别出现在17:00和22:00左右,达0.4217g/h和0.8082 g/h,直到0:00降至最小为0.2993g/h;之后趋于平稳,次日8:00左右再次达到排放高峰,排放量为0.6587 g/h。而CO2在各个测定时间段内差异不显著(p>0.05)。因此,舍饲条件下绵羊CH4和CO2排放量动态(g/m in)变化不同步。由此,推算出舍饲绵羊(25±5)kg年排放CH4和CO2总量分别约为4.38 kg和53.66 kg。更多还原

【Abstract】 Diurnal dynamics of methane(CH4) and carbon dioxide(CO2)emissions were measured on three wether crossbred sheep(average weight(25±5) kg).The animals were fed ground corn and hay(at a ratio of 6∶4) in amounts that fulfilled their calculated requirements of metabolizable protein and energy.During measurements,each animal was maintained in a respiration chamber and methane and carbon dioxide outputs were recorded at regular intervals over 24 hours.The sheep were adapted to the chamber prior to measurements by being placed in the chamber for 3-4 hours followed by an hour break continually over a one week period.During measurements,inside and outside chamber temperatures and inside chamber humidity were recorded every 5 minutes.Emission of methane and carbon dioxide averaged 11g/d and 147g/d,equivalent to 4.38 kg/a and 53.66 kg/a respectively.Peak methane output occurred at 22:00(0.808 g/day),while lowest output occurred at 0:00(0.299 g/h).In contrast to methane output,the output of carbon dioxide concentration was relatively stable,which suggested that the dynamic output patterns of methane and carbon dioxide were not similar.更多还原