Abstract: Methane (CH₄) is a major greenhouse gas. In order to explore the characteristics of CH₄ fluxes in the grazing system in temperate meadow steppe,we set five grazing treatments as:enclosed (CK),continuous grazing (CG),early-resting (R1),mid-resting (R2) and late-resting (R3),and monitoring soil CH₄ fluxes during the grazing season and measuring the CH₄ emissions from the sheep grazed in the grazing treatments,respectively;the contribution of grassland soil about the CH₄ “carbon sink” was also calculated. The results showed that the fluxes of CH₄ absorbed by grassland soil on different date ranged from 25.37 to 79.46 μg·m^-2·h^-1,the uptake values of CH₄ by grassland soil were highly significant (P<0.001) among treatments with a higher in CG,R1,R2 and R3 grazing treatments than that in CK;the grazing sheep in R3 emitted the highest CH4 and those in R2 emitted the lowest (P<0.001). The CH₄-C “carbon sink” contribution of grassland soil was also significantly different between among different grazing treatments (P<0.001),and it was the highest in CG and the lowest in R1. In conclusion,seasonal-resting could not only increase the CH₄ absorption of grassland soil,but also reduce the CH₄ emissions of sheep,moderate continuous grazing and mid-resting are suitable for local grassland grazing management.

Key words: Seasonal-resting, Meadow steppe, Grazing system, Methane

摘要： 甲烷(CH₄)是1种主要的温室气体。为了探究温性草甸草原放牧系统的CH₄通量特征，本研究设置了围封(CK)、持续放牧(CG)、早期休牧(R1)、中期休牧(R2)以及晚期休牧(R3)等多个处理，通过监测放牧季的土壤CH₄通量并测定放牧绵羊的CH₄排放量，计算了草地土壤的CH₄“碳汇”贡献度。结果表明：草地土壤在不同日期吸收CH₄的通量范围是25.37~79.46 μg·m^-2·h^-1，吸收值在不同处理之间差异极显著(P<0.001)，且CG，R1，R2和R3处理均高于CK处理；放牧绵羊的CH₄排放量在R3处理中最高而在R2处理中最低(P<0.001)；草地土壤吸收CH₄-C的贡献度在不同处理之间也具有极显著的差异(P<0.001)，CG处理最高而R1处理最低。综上所述，季节性休牧既可以增加草地土壤对CH₄的吸收，也会减少绵羊的CH₄排放量，适度的持续放牧和中期休牧处理是适合当地的草地放牧管理方式。

关键词: 季节性休牧, 草甸草原, 放牧系统, 甲烷