长白山阔叶红松林碳收支特征  

Carbon budget characteristics of the broadleaved Korean pine forests in Changbaishan Mountains.

作　　者：吴家兵[1] 关德新[1] 张弥[2] 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

出　　处：《北京林业大学学报》2007年第1期1-6,共6页Journal of Beijing Forestry University

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(KZCX1--SW--01--01);中国科学院院长奖获得者科研启动专项资金资助项目

摘　　要：植被-大气间CO2交换研究对准确评价陆地生态系统碳收支有重要意义．该研究采用开路式涡动相关系统对长白山阔叶红松林的CO2交换特征进行了整年连续监测．结果表明，该森林生态系统的碳交换季节变化明显，2003年森林净生态系统碳交换量（NEE）变化范围在-6．37—2．13g/（m^2·d）之间，5—9月均表现为碳汇，其余月份为碳源，其中净碳吸收量与释放量最大的月份分别为6和10月；全年森林净吸收的碳量为-191．3g/m^2，整体表现为一定强度的碳汇．影响NEE的环境因子主要是光合有效辐射（PAR）和土壤温度等，白天NEE对PAR的响应符合直角双曲线方程，夜间的NEE与5cm深土壤温度有较好的指数关系．生态系统呼吸释放对温度响应的敏感性（Q10）为3．17．Studies on CO2 exchange between vegetation and atmosphere can enhance the scientific understanding and modelling of carbon budget on terrestrial ecosystem. As a part of the ChinaFLUX program, CO2 flux was measured for year-round in 2003 by an open-path eddy covariance system over a broadleaved Korean pine forests in nortbeastem China. The net ecosystem carbon exchange （NEE） between forest and atmosphere ranged from - 6.37 to 2.13 g/（m2 ~ d） during the observational year, with the net carbon assimilation peak occurred in June, and a highest net carbon efflux occurred in October. The nocturnal NEE showed an exponential regression relationship with 5 cm depth soil temperature, and the CO2 respiration Q10 of ecosystem was 3.17. With the increase of photosynthetic active radiation （PAR）, CO2 flux changes were in well accordance with the curve of Michaelis-Menten model. The total NEE was - 191.3 g/m^2 in 2003, which indicated that the broadleaved Korean pine forests of Changhaishan Mountains were functioning as a moderate carbon sink.

关 键 词：温带森林 CO2通量 涡动相关法 碳收支 

分 类 号：S791.247[农业科学—林木遗传育种] S718.45[农业科学—林学]