作　　者： ; ; ; ;

机构地区： 中山大学环境科学与工程学院

出　　处： 《环境科学学报》 2009年第4期822-829,共8页

摘　　要： 利用中巴卫星影像采用监督分类的方法对影像进行解译,并反演珠江三角洲4种主要的植被类型(PFT).利用自然排放气体和气溶胶模式——MEGAN(Model of Emissions of Gases and Aerosols from Nature),对典型夏季日珠江三角洲地区植被异戊二烯的排放进行了初步研究.结果显示:估算日珠江三角洲植被异戊二烯总的排放量为1.73×106kg(以C计,下同).异戊二烯的排放有明显的日变化特征,最大排放量出现在14:00,为2.39×105kg.广州、江门和惠州的异戊二烯平均排放速率最大,分别为4580g·km-·2h-1、4250g·km-·2h-1和4130g·km-·2h-1;同时江门和惠州也为异戊二烯日排放量的高值区,其日排放总量分别为4.60×105kg和4.29×105kg,排放贡献率分别为26.6%和24.8%. Images from the Chinese Brazil Earth Resources Satellite （CBERS） were interpreted using a supervised classification method, to detect the fractions of plant function types （PFTs） in the Pearl River Delta （PRD） region. The Model of Emissions of Gases and Aerosols from Nature （MEGAN） was used in conjunction with new PFT maps to estimate isoprene emissions for a typical summer day in the PRD. The preliminary results reveal： ① the total isoprene emission is 1.73 ×10^6kg; ② isoprene emission has a marked diurnal cycle and the highest emission occurred at 14：00 local time with a maximum value of 2.39 ×10^5 kg;③isoprene emission displays large differences in its spatial distribution. The average emission rates of Guangzhou, Jiangmen, and Huizhou are 4580 g· km^-2· h^-1,4250 g·km^ -2· h^ -1 and 4130 g· km^-2· h^ -1, respectively, which represent the three highest values in the PRD. Jiangmen and Huizhou are the two cities with the highest emissions in the PRD and have total isoprene emissions of 4.60 × 10^5 kg and 4.29× 10^5 kg, respectively; and the contributions of the two cities to the total regional emission are about 26.6% and 24.8%.

关 键 词： 异戊二烯 植被 珠三角

领　　域： [环境科学与工程]