采用红外CO_2测量仪对北京奥林匹克森林公园2007年度的CO_2浓度变化特征进行连续跟踪测量。结果表明:公园内CO_2浓度存在明显的日期、季节变化规律,主要影响因素有植被光合作用、植被呼吸作用、土壤呼吸作用等。公园内部样点在明显的梯度变化规律,主要影响因素有绿化覆盖率、植被生长状况、植被类型等。 The CO_2 concentration changes in Beijing Olympic Forest Park in 2007 were measured continuously by infrared CO_2 meter. The results showed that there were obvious date and seasonal variation of CO 2 concentration in the park. The main influencing factors were vegetation photosynthesis, vegetation respiration and soil respiration. The sampling pattern of internal gradient in the park is obvious, and the main influencing factors are green coverage rate, vegetation growth status and vegetation type.