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区域环境与生态

司徒淑娉,王雪梅,Alex Guenther,柴子为,邓儒儒.典型夏季珠江三角洲地区植被的异戊二烯排放[J].环境科学学报,2009,29(4):822-829

Typical summertime isoprene emission from vegetation in the Pearl River Delta region,China

基金项目：国家自然基金项目(No.40875076,U0833001);美国大气研究中心(NCAR)主任基金(No.S07-62181);中国科学院知识创新工程领域前沿项目(IAP07306);国家教育部留学回国基金资助项目(No.4105310)

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^-2·h^-1、4250g·km^-2·h^-1和4130g·km^-2·h^-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%.

Abstract：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 PFTmaps to estimate isoprene emissions for a typical summer day in the PRD.The preliminary results reveal:① the total isoprene emission is 1.73×10⁶kg;② isoprene emission has a marked diurnal cycle and the highest emission occurred at 14:00 local time with a maximum value of 2.39×10⁵kg;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 PRDand have total isoprene emissions of 4.60×10⁵kg and 4.29×10⁵kg,respectively;and the contributions of the two cities to the total regional emission are about 26.6% and 24.8%.