锡林郭勒草原不同植物生物源挥发性有机物排放通量

Biogenic Volatile Organic Compounds Emission Fluxes from the Different Plants in Xilingol Grassland

生物源挥发性有机物对近地面臭氧及二次有机气溶胶的形成过程起着重要作用。为探究内蒙古锡林郭勒草原不同植物排放挥发性有机物排放通量,采用动态箱采样法采集,GC/MS测定其排放通量,同时记录温度、湿度和光合有效辐射参数;在标准状态(30 ℃,1 000 μmol/(m2·s))下,依据G95模式和G93模式,分别推定了不同植物排放异戊二烯和单萜烯类化合物的排放通量。结果表明:(1)羊草、冰草、狼毒、克氏针茅、达乌里黄芪、芨芨草、冷蒿、木地肤、麻叶荨麻,在标准状态下异戊二烯排放通量和单萜烯类化合物排放通量依次为(204.60±11.86)、(412.90±9.27)、(1548.10±24.30)、(322.34±1.02)、(590.54±151.22)、(226.40±110.15)、(204.19±98.79)、(529.95±209.88)、(305.62±137.98) μg/(m2·h)和(1059.57±874.58)、(199.28±42.16)、(23.67±8.09)、(121.79±79.38)、(402.22±31.80)、(92.53±48.88)、(294.54±112.74)、(62.78±16.24)、(164.07±61.83) μg/(m2·h);(2)羊草、冰草、冷蒿、麻叶荨麻排放的异戊二烯排放通量由光合有效辐射和温度共同影响;(3)温度对单萜烯类化合物排放通量的影响明显。

Biogenic volatile organic compounds(BVOC)play an important role in the formation of near-surface ozone and secondary organic aerosols.In order to explore the emission fluxes of biogenic volatile organic compounds from different plants in Xilingol grassland of Inner Mongolia,using dynamic chamber system-GC/MS,simultaneously recording air temperature,relative humidity and photosynthetically active radiation.Estimated to the standard conditions(30 ℃,1 000 μmol/(m2·s))emission fluxes of isoprene and monoterpenes from different plants according to the G95 and the G93 model,respectively.The results showed that:(1)the standard emission fluxes of isoprene and monoterpenes from Leymus chinensis,Agropyron cristatum,Stellera chamaejasme,Stipa krylovii,Astragalus dahuricus,Achnatherum splendens,Artemisia frigid Willd.,Kochia prostrata,Urtica cannabina were(204.60±11.86),(412.90±9.27),(1 548.10±24.30),(322.34±1.02),(590.54±151.22),(226.40±110.15),(204.19±98.79),(529.95±209.88),(305.62±137.98) μg/(m2·h)and(1 059.57±874.58),(199.28±42.16),(23.67±8.09),(121.79±79.38),(402.22±31.80),(92.53±48.88),(294.54±112.74),(62.78±16.24),(164.07±61.83) μg/(m2·h)respectively;(2)the change of isoprene emission fluxes from Leymus chinensis,Agropyron cristatum,Artemisia frigid Willd.and Urtica cannabina were consistent with that of photosynthetically active radiation and temperature;(3)the monoter-penes emission fluxes were more significant effected on temperature.