热带森林植被冠层CO2储存项的估算方法研究

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(FNEE)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(Fs-EC)和廓线法(Fs-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...

Estimation of CO_2 storage flux between forest and atmosphere in a tropical forest

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 (Fs-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.