热带人工橡胶林异戊二烯排放通量的模式研究

Model simulation of isoprene emission flux in a tropical forest plantation of rubber trees

2 0 0 2年 7月中旬 (湿季 ) ,我们利用快速异戊二烯系统对云南热带森林异戊二烯的排放通量进行了连续测量 ,同时对其影响因子光合有效辐射、气温、湿度、风等参数进行了观测 .研究表明 ,该地区人工橡胶林异戊二烯的排放有明显的日变化 ,云和降水可以明显减小异戊二烯的排放 .利用光合有效辐射守恒的观点处理与植物异戊二烯排放有关的过程 ,建立了一个计算异戊二烯排放的经验模式 ,计算值与观测值比较接近 .因此 ,以一定的物理原理和对实际大气状况观测资料的分析为基础 ,建立异戊二烯排放模式的方法是可行的 .

Continuous measurements on emission flux of isoprene were made by a fast isoprene system in a tropical forest in the middle of July 2002. Other parameters such as photosynthetically active radiation (PAR), air temperature, humidity, wind speed were also measured. The emission flux of isoprene in the rubber trees in wet season showed an obvious diurnal variation, and the clouds and precipitation could evidently decrease the emission flux of isoprene. The main energy processes related to biogenic isoprene emission were considered, according to the point of view of PAR energy transmission and conservation, and an empirical model for isoprene emission flux was established. The results show that the calculated values were close to the observed ones. Therefore, it is practical to build up a model for isoprene emission flux, based on physical principles and analysis of observational data measured under field conditions.