不同利用方式对羊草草原土壤碳矿化潜力的影响  

Effects of different land use patterns on soil carbon mineralizatio potential in Leymus chinensis

作　　者：邹雨坤[1,2] 王丽[2] 张静妮[2] 陈秀蓉[1] 杨殿林[2] 

机构地区：[1]甘肃农业大学草业学院/草业生态系统教育部重点实验室/中-美草地畜牧业可持续发展研究中心,甘肃兰州730070 [2]农业部环境保护科研监测所,天津300191

出　　处：《草原与草坪》2012年第3期70-73,共4页Grassland and Turf

基　　金：国家自然科学基金(30770367;31000242)资助

摘　　要：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.

关 键 词：羊草草原 利用方式 碳矿化 

分 类 号：S152[农业科学—土壤学]