二氧化碳储存通量对森林生态系统碳收支的影响  

Effects of CO_2 storage flux on carbon budget of forest ecosystem

作　　者：张弥[1,2] 温学发[1] 于贵瑞[1] 张雷明[1] 伏玉玲[1] 孙晓敏[1] 韩士杰[3] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]中国科学院研究生院,北京100049 [3]中国科学院沈阳应用生态研究所,沈阳110016

出　　处：《应用生态学报》2010年第5期1201-1209,共9页Chinese Journal of Applied Ecology

基　　金：国家基础研究发展计划重点项目(G2010CB833500);国家自然科学基金重点项目(30590381);中国科学院知识创新工程重要方向性项目(KZCX2-YW-432-3);国家自然科学基金青年基金项目(30700110)资助

摘　　要：涡度相关系统观测高度以下的CO2储存通量对准确评价森林生态系统与大气间净CO2交换量(NEE)有着重要的影响.本研究以长白山阔叶红松林为研究对象,利用2003年的涡度相关观测数据以及CO2浓度廓线数据,分析了CO2储存通量的变化规律及其对碳收支过程的影响.结果表明:涡度相关观测高度以下的CO2储存通量具有典型的日变化特征,其最大变化量出现在大气稳定与不稳定层结转换期.利用涡度相关系统观测的单点CO2浓度变化方法与利用CO2浓度廓线方法计算的CO2储存通量差异不显著.忽略CO2储存通量,在半小时尺度上会造成对夜间和白天的NEE分别低估25%和19%,在日和年尺度上,会对NEE低估10%和25%;忽略CO2储存通量,会低估Michaelis-Menten光响应方程及Lloyd-Taylor呼吸方程的参数,并且对表观初始量子效率α和参考呼吸Rref的低估最大;忽略CO2储存通量,在半小时、日及年尺度上,均会对总光合作用(GPP)和生态系统呼吸(Re)低估约20%.Carbon dioxide （CO2） storage flux in the air space below measurement height of eddy covariance is very important to correctly evaluate net ecosystem exchange of CO2 （NEE） between forest ecosystem and atmosphere. This study analyzed the dynamic variation of CO2 storage flux and its effects on the carbon budget of a temperate broad-leaved Korean pine mixed forest at Changbai Mountains,based on the eddy covariance flux data and the vertical profile of CO2 concentration data. The CO2 storage flux in this forest ecosystem had typical diurnal variation,with the maximum variation appeared during the transition from stable atmospheric layer to unstable atmospheric layer. The CO2 storage flux calculated by the change in CO2 concentration throughout a vertical profile was not significantly different from that calculated by the change in CO2 concentration at the measurement height of eddy covariance. The NEE of this forest ecosystem was underestimated by 25% and 19% at night and at daytime,respectively,without calculating the CO2 storage flux at half-hour scale,and was underestimated by 10% and 25% at daily scale and annual scale,respectively. Without calculating the CO2 storage flux in this forest ecosystem,the parameters of Michaelis-Menten equation and Lloyd-Taylor equation were underestimated,and the ecosystem apparent quantum yield （α） and the ecosystem respiration rate （Rref） at the reference temperature were mostly affected. The gross primary productivity （GPP） and ecosystem respiration （Re） of this forest ecosystem were underestimated about 20% without calculating the CO2 storage flux at half-hour,daily scale,and annual scale.

关 键 词：森林生态系统 CO2储存通量 净生态系统CO2交换 

分 类 号：S718.5[农业科学—林学]