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利用LI-6400CO2分析系统测定了长白山红松针阔叶混交林生态系统土壤呼吸、乔木和灌木树干和枝条的呼吸、植物叶片光合与呼吸．同步监测森林小气候气象因子,建立土壤、树干、叶片与气象因子间的模型．根据红松针阔叶混交林植被群落特性,估算红松针阔叶混交林森林生态系统不同组分CO2通量．利用涡度相关技术监测红松针阔叶混交林净生态系统交换量．探讨温度、光合有效辐射对森林生态系统CO2通量的影响．通过分析发现,在当年的气候条件下,该森林净生态系统交换量主要受土壤呼吸和叶片光合的影响．红松针阔叶混交林净生态系统交换量全年变化范围在-4．67～13．80μmol·m-2·s-1．该森林生态系统CO2通量在冬季和夏季里平均分别为-2．0和3．9μmol·m-2·s-1(24 h平均值)．乔木、灌木和草本的初级生产力分别占阔叶红松林总初级生产力的89．7％,3．5％,6．8％．土壤呼吸是森林生态系统中最主要的CO2排放源,约占红松针阔叶混交林生态系统CO2排放的69．7％,植物叶片和枝干分别占15．2％和15．1％．在生长季和非生长季中红松针阔叶混交林净生态系统交换量分别占全年CO2通量的56．8％和43．2％．自养呼吸占总初级生产力的比值(Ra:GPP)为0．52(NPP:GPP=0．48)．森林生态系统地下当年碳积累量占总初级生产力的52％．土壤呼吸占总初级生产力的60％．红松针阔叶混交林NPP为769．3 gC·m-2·a-1．该森林净生态系统交换量(NEE)为229．51 gC·m-2·a-1．涡度相关技术获得的该森林生态系统NEE低于箱式法获得的19．8％．
The soil respiration, the respiration of tree and shrub trunk and shoots, and the photosynthesis and respiration of plant leaves in the ecosystem of Changbai Mountain Korean pine and broad-leaved mixed forest were measured by LI-6400CO2 analysis system. Simultaneous monitoring of meteorological factors of forest microclimate, the establishment of soil, tree trunks, leaf and meteorological factors between the model. According to the characteristics of vegetation community in Korean pine coniferous and broad-leaved mixed forest, the CO2 flux of different components of forest ecosystem of Korean pine coniferous broad-leaved mixed forest was estimated. Monitoring the Net Ecosystem Exchange of Korean Pine and Broad - Leaved Mixed Forest by Using Eddy Covariance Technique. To investigate the effects of temperature and photosynthetically active radiation on CO2 fluxes in forest ecosystems. Through the analysis, we found that under the current climate conditions, the exchange of net forest ecosystem is mainly affected by soil respiration and leaf photosynthesis. The annual net ecosystem exchange of Korean pine and broad-leaved mixed forest ranged from -4.67 to 13.80 μmol · m-2 · s-1. The CO2 flux of the forest ecosystem averaged -2.0 and 3.9 μmol · m-2 · s-1 (24 h average) in winter and summer, respectively. The primary productivity of arbor, shrub and herb respectively accounted for 89.7%, 3.5% and 6.8% of the total primary productivity of the broad-leaved Korean pine forest. Soil respiration is the most important source of CO2 emissions in forest ecosystems, accounting for 69.7% of the CO2emissions of broad-leaved Korean pine forest ecosystems, with plant leaves and branches accounting for 15.2% and 15.1% respectively. The net ecosystem exchange of Korean pine and broad-leaved mixed forests accounted for 56.8% and 43.2% of the annual CO2 flux in the growing and non-growing seasons respectively. The ratio of autotrophic respiration to total primary productivity (Ra: GPP) was 0.52 (NPP: GPP = 0.48). Carbon accumulation in forest ecosystems during the year accounted for 52% of the total primary productivity. Soil respiration accounts for 60% of total primary productivity. The NPP of Korean pine and broad-leaved mixed forest was 769.3 gC · m-2 · a-1. The forest net ecosystem exchange (NEE) was 229.51 gC · m-2 · a-1. The NEE of the forest ecosystem obtained by eddy covariance technique is lower than 19.8% obtained by the box method.