为研究大规模城市绿地植被的固碳功能和效益,对北京奥林匹克森林公园进行了连续6 a(2005-2010年)的二氧化碳摩尔分数观测,结果表明:2009-2010年季节二氧化碳摩尔分数由低到高依次为夏季(340μmol·mol-1)、秋季(380μmol·mol-1)、春季(408μmol·mol-1)和冬季(418μmol.mol-1)；春季,二氧化碳摩尔分数在2008年之后的连续3a中呈现逐渐增高的趋势,且公园绿地样点二氧化碳摩尔分数均低于对比样点；夏季,2005 -2007年的公园样点(372 μmol·mol-1)、对比样点(352 μmol·mol-1)的二氧化碳摩尔分数略高于2008-2010年公园样点(336μmol·mol-1)和对比样点(346 μmol·mol-1)的；秋季,公园绿地样点的二氧化碳摩尔分数均低于对比样点的,2008年的二氧化碳摩尔分数呈现一个显著的低值；冬季的二氧化碳在测定年度内呈现浮动情形.在公园绿地的不同建设阶段,其范围内的二氧化碳摩尔分数通过与代表城市一般环境的对比样点对比,说明绿地植被对于降低其范围内二氧化碳摩尔分数的固碳功能方面作用显著.%Carbon dioxide (CO2) concentration in Beijing Olympic Forest Park (BOFP) was measured from 2005 to 2010 to study the ecological benefits of vegetation in urban green space. Results indicated that, during 2009-2010, the CO, concentration in winter was the highest (418 μmol · mol-1), followed by spring (408 μmol · mol-1), fall (380 μmol · mol-1) and summer (340 μmol · mol-1). The CO2 concentration in spring increased gradually from 2008 to 2010, and the CO2 concentration in BOFP was lower than that in the CK. In summer, the average CO2 concentrations in BOFP (372 ujnol · mol-1) and CK (352 μmol · mol-1) during 2005-2007 were both higher than those in BOFP (336μmol · mol-1) and CK (346 μmol · mol-1) during 2008-2010, respectively. In fall, the CO2 concentration in BOFP was lower than that in the CK, and a minimum value was observed in 2008. The CO, concentration in winter fluctuated around a higher level in the six years of observation. Results show that the carbon sequestration function of vegetation in urban green space is obvious due to the decrease in CO, concentration.
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