浙江省毛竹异戊二烯排放规律及其影响

Isoprene Emission of Bamboo and its Implication to Ozone Level in Region

主要对中国南方广泛分布的毛竹进行了异戊二烯排放的观测和模拟研究 ,以浙江省为例进行了毛竹异戊二烯排放量的估算 ,并将太湖流域的竹子分布与 O3浓度观测结果进行了比较 ,以期探索毛竹对区域对流层大气化学环境变化的贡献。观测结果表明毛竹是异戊二烯排放潜力较大的植被 ,其值为 1 1 6± 2 3 .4ug.g- 1.h- 1,浙江省 1 996年毛竹的异戊二烯排放量为 0 .75 9Mkg,排放在夏季达到峰值 ,其中 6、7、8三个月的排放量占全年总排放量的 5 8.9%。通过将 O3观测结果与竹林分布比较分析推断 ,农村地区 (临安 )出现的高 O3浓度可能与大面积竹林的异戊二烯排放有关。如果这种假设能够得到证明 。

As the most abundant BVOC (Biogenic Volatile Organic Compound) , isoprene is one important source of reactive carbon of troposphere. It affects local atmospheric chemistry and environment. The oxidation of isoprene can affect the concentration of OH, O 3 and CO, and also contribute to the formation of organic acid and photochemical transformation of NO X. In order to find the bamboo's ( Phyllostachys pubescens ) quantitative contribution to the atmospheric chemistry environment change, observation and simulation of isoprene emission from bamboo, distributed widely in the Southern part of China, have been done. And the total isoprene emission from bamboo was estimated in Zhejiang province as a case. The emission factor of bamboo is 116±23 4ug.g -1 .h -1 , measured by enclosed measurement and chromatogram with photo\|ionization detector. Guenther's model is satisfied well to simulate isoprene emission measured for bamboo. The total annual isoprene emission from bamboo is 0 795Mkg in Zhejiang province in 1996 58.9% of isoprene from bamboo release in the period of June to August. Its maximum emission occurs in the summer. Comparison between bamboo's distribution and O 3 concentration in Taihu valley shows that the high concentration of O 3 maybe closely relate to the distribution of bamboo in rural, Lin'an as a case. This work will pose a hypothesis for explanation of high atmospheric O 3 occurring in some rural area.