夏季呼和浩特市生物源挥发性有机物排放速率空间分布OA北大核心CSTPCD

To determine the spatial distribution characteristics of biogenic volatile organic compound(BVOCs)emission rates in Hohhot,13 dominant tree species were selected for qualitative and quantitative analyses using dynamic box sampling combined with ATD-GC/MS.The standard emission rates of the BVOCs were then calculated.Sentinel-2 remote sensing data for the Hohhot region were obtained,and vegetation was classified using an SVM classifier and the vegetation NDVI index.Subsequently,the biomass of forests and grasslands in the Hohhot region was estimated using a fitting model that linked the LAI,NDVI,and aboveground biomass(AGB).A spatial distribution map of the BVOCs emission rates under standard conditions(T:303 K,PAR:1000 μmol∙m-2∙s-1)was created.The results showed that the standard emission rate of BVOCs in Hohhot during summer was 4.65×105 g∙km-2∙h-1.The spatial distribution characteristics were as follows:higher isoprene emission rates were observed on the west and northeast sides of Tumod Left Banner,east side of Helinger County,and northeast side of Qingshuihe County,whereas lower emission rates were observed in Wuchuan County,southwest Helinger County,and southwest Qingshuihe County.Similarly,higher monoterpene emission rates were identified on the west and northeast sides of Tumod Left Banner,south side of Wuchuan County,and northeast side of Xincheng District in Hohhot;lower rates were observed in Wuchuan County,west to southeast Helinger County,and west to south Qingshuihe County.Overall,the BVOCs emission rates in Hohhot were higher in the north and east,and lower in the south and west.These findings provide significant scientific evidence for the accurate assessment of ozone pollution in Hohhot during summer.