试验于2011年7月～2012年7月在同一栋牛舍内对20头干乳牛和20头泌乳牛分别进行了四季的甲烷排放量测定,在每个季节的季初、季中、季末测定三次,每次测定24h.结果表明:干乳牛春季、夏季、秋季、冬季的CH4排放量分别为228.73g/(头·d)、234.09g/(头·d)、218.35g/(头·d)、178.22g/(头·d).泌乳牛春季、夏季、秋季、冬季的CH4排放量分别为304.49g/(头·d)、314.43g/(头·d)、292.11g/(头·d)、238.07g/(头·d).干乳牛与泌乳牛在夏季CH4排放量最多,在冬季CH4排放量最少.泌乳牛比干乳牛CH4排放量高,平均高出1.3～1.4倍.%In 2011 July to 2012 July in the same cowshed, methane emission was determined between 20 dry cows and 20 first lactating cows in four seasons, which determined three times, and each time determined 24hr. The results showed that: CH4 emission from dry cows was 228.73g/(headd), 234.09g/(headd), 218.35g/(headd), 178.22 g/(head·d) in spring, summer, autumn and winter respectively. CH4 emission from lactating cows was 304.49g/(head·d), 314.43g/(head·d), 292.1 lg/(head·d ), 238.07g/(head·d) in spring, summer, autumn and winter respectively. CH4 emission from dry cows and dairy cows in summer was maximum, and at least in the winter. Lactating cows exhausted more CH4, an average of 1.3-1.4 times higher than that of dry cows.
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