中文摘要：

评价植被冠层CO2储存项有助于提高森林-大气层面净生态系统CO2交换量（F NEE）的估算精度。基于西双版纳热带季节雨林2年完整的涡度相关系统和CO2廓线的同步观测资料，详细分析涡度相关法（F s-EC）和廓线法（F s-PM）CO2储存项估算结果和变化趋势。结果表明：1）廓线法CO2储存项年平均日变化曲线相比涡度相关法能更真实地反映冠层内外CO2浓度时空变化特征。2）廓线法估算的CO2储存项年总量值为-0．04t／（hm2·a），涡度相关法为-0．17t／（hm2·a）。3）由于复杂地形条件下的西双版纳热带季节雨林存在较大CO2浓度梯度，采用廓线法进行CO2储存项估算比涡度相关法更为合适。

英文摘要：

Evaluating CO2 storage flux may help us to improve the calculation accuracy of net ecosystem CO2 exchange （ FNEE ） . Based on data of two consecutive years from an eddy covariance system and a vertical CO2 profile system in a tropical seasonal rainforest in Xishuangbanna, southwest China, CO2 storage flux was calculated by two methods, eddy covariance （F s-EC） and profile （Fs- PM） methods. Results show that： 1） Comparing with eddy covariance method, diurnal variation of CO2 storage flux calculated by profile method could directly reflect the spatial-temporal variation of CO2 ; 2） Total amount value of CO2 storage flux calculated by profile method was -0.04 t/（ hm2· year）, and the value calculated by eddy covariance method was -0. 17 t/（ hm2·year） ; 3） Under complex terrain and tall forest conditions, with a large concentration gradient of CO2 , profile method for calculation of CO2 storage flux had an advantage over eddy covariance method.