长白山温带森林单萜烯排放模拟

于2010年夏季,采用松弛涡度积累(Relaxed Eddy Accumulation)技术在长白山温带森林铁塔上测量了挥发性有机物(VOC)冠层尺度的排放通量,同步测量了气象参数、光合有效辐射(PAR)等,初步获得长白山阔叶林单萜烯的排放通量.同时,利用PAR能量守恒原理,建立了冠层尺度上单萜烯排放的经验模式.结果发现,模拟结果与测量结果比较一致,平均而言,模拟值高出测量值约20%～40%.采用不同方法对经验模式进行了检验,结果表明,采用比较各个采样时段平均值的方法可行,而且经验模式对于2010年夏季不同采样时段的平均值也给出了较好的模拟结果,其模拟值高出测量值约20%～24%.

Simulation of monoterpene emission in a temperate forest on Changbai Moutain

Volatile organic compound (VOC) emission fluxes were quantified using the relaxed eddy accumulation (REA) technique on an above-canopy tower in a temperate forest on Changbai Mountain, China during the summer season in 2010. Meteorological parameters, solar global radiation and photosynthetically active radiation (PAR) were also measured during the same period of time. An empirical model for calculating canopy scale monoterpene emission flux was developed based on PAR energy conservation. The model was able to explain much of the observed variations. On the average, the simulated fluxes were about 20% to 40% higher than the measured. Different methods were used to validate the empirical model and the results showed that it was a better way to compare the averages of the measured and simulated emission fluxes. Improved simulations were obtained for the averages of monoterpene emission fluxes at different time periods in 2010 summer, and the simulated fluxes were 20%~24% higher than those measured.