长白山阔叶红松林二氧化碳浓度特征  

CO_2 concentration character in broad-leaved Korean pine forest of Changbai Mountains.

作　　者：吴家兵[1] 关德新[1] 赵晓松 韩士杰[1] 于贵瑞[2] 孙晓敏[2] 

机构地区：[1]中国科学院沈阳应用生态研究所 [2]中国科学院地理科学与资源研究所,北京100101

出　　处：《应用生态学报》2005年第1期49-53,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30370293);中国科学院知识创新工程重大项目(KZCX1SW0101A);中国科学院沈阳应用生态研究所领域前沿资助项目.

摘　　要：采用红外气体分析仪对长白山阔叶红松林2003年度CO2浓度特征进行了分层连续监测,并结合同步气象资料进行了分析.结果表明,长白山阔叶红松林CO2浓度存在明显的日变化、季变化与垂直变化,这些变化与植被生理活动、土壤呼吸及林内湍流交换强度有关.生长季林内全天CO2浓度最高值出现在凌晨500左右的近地面层,最低值出现在午后1500左右的冠层部位;日出前后,随着逆温层的打破,林下CO2有一明显的释放过程.观测期间林内CO2平均浓度为377μmol·mol-1,月平均最高值出现在1月,为388μmol·mol-1,最低值出现在8月,为352μmol·mol-1.生长季夜间森林表现为CO2的排放源,日间表现为CO2的吸收汇;非生长季日间与夜间森林都主要表现为CO2的排放源,但在午间冠层部位仍有数小时表现为CO2的吸收过程.The CO_2 concentration in broad-leaved Korean pine forest of Changbai Mountains was measured continuously with a CO_2 infra-red analyzer in 2003. The results showed that the CO_2 concentration in the forest had striking characteristics of temporal-spatial variations, which were mainly influenced by the physiological processes of plants, soil respiration, and intensity of turbulence exchange. In growing season, the daily maximum and minimum CO_2 concentration appeared mostly on the surface floor at about 5:00 in the early morning and at canopy location at about 15:00 in the afternoon, respectively. There was an obviously process of forest CO_2 emission when the inversion broke at dawn. The average CO_2 concentration in forest was 377 μmol·mol^-1 in 2003, the maximum of monthly average appeared in January as 388 μmol·mol^-1 , and the minimum of monthly average appeared in August as 352 μmol·mol^-1 . The forest acted as CO_2 source in night time and turned to sink in daytime, during growing season. In non-growing season, the forest acted as CO_2 source in both daytime and night time, but still had a clear evidence of CO_2 assimilation at noon, with canopy location during non-growing season.

关 键 词：CO2浓度 长白山 阔叶红松林 CO2交换 

分 类 号：S718[农业科学—林学]