以内蒙古呼伦贝尔羊草草原为研究对象,利用室内培养法比较研究了刈割、放牧和围栏封育3种利用方式对羊草草原土壤碳矿化潜力的影响。结果表明：不同利用方式下,土壤碳矿化潜力不同。在25℃条件下,羊草草原0～10cm土层培养30d结束时的矿化速率在刈割、放牧和围封干扰下分别为培养开始5d时的15.3%,9.5%和10.2%;10～20cm土层培养30d结束时的矿化速率在刈割、放牧和围封干扰下分别为培养5d开始时的5.6%,18.6%和13.9%。0～10cm土层矿化累积释放的CO2-C量大小依次为刈割〉围封〉放牧,刈割与放牧样地差异显著。样地10～20cm土层矿化累积释放的CO2-C量大小依次为刈割〉放牧〉围封,刈割与围封样地差异显著,且0～10cm土层的CO2-C累积释放量〉10～20cm土层。%Carbon mineralization potential of mowed,grazed and fenced Leymus chinensis steppes was determined in Hulunbeier grassland of Inner Mongolia by using approaches of culture under lab condition. The results showed that carbon mineralization potential was different under different land use patterns. The velocity of carbon mineralization at 5 d was 15.3%,9.5% and 10.2% respectively in layer of 0-10 cm,and 5.6%,18.6% and 13.9% respectively at 5 d in layer of 10-20 cm. The content of CO2-C released from the mineralization of soil organic C can be ordered as mowing plots〉fencing plots〉grazing plots in layer of 0-10 cm;and mowing plots〉grazing plots〉fencing plots in layer of 10-20 cm. The total content of CO2-C released from the mineralization of soil organic C in layer of 0-10 cm was higher than the layer of 10-20 cm.
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