Seasonal variations in whole-ecosystem BVOC emissions and ozone fluxes from a tropical rubber tree plantation in China

文献类型： 外文期刊

第一作者： Bai, Jianhui

作者： Bai, Jianhui;Wu, Zhixiang;Yang, Chuan;Wu, Zhixiang;Yang, Chuan;Guenther, Alex

作者机构：

关键词： Biogenic volatile organic compounds; Emission flux; Ozone flux; Photosynthetically active radiation (PAR)

期刊名称：ATMOSPHERIC ENVIRONMENT （ 影响因子：3.7； 五年影响因子：4.2 ）

ISSN： 1352-2310

年卷期： 2025 年 351 卷

页码：

收录情况： SCI

摘要： Biogenic volatile organic compound (BVOC) and O3 fluxes and concentrations, along with environmental variables such as solar radiation and air temperature, were measured in a tropical rubber tree plantation in China from August 2018 to June 2019. The detected BVOC fluxes included five terpenoid compounds, isoprene and four monoterpenes, measured using a gradient (GRA) sampling system deployed on an above canopy flux tower. Isoprene accounted for only 13 % of total terpenoid emissions at this site. The remaining 87 % of total terpenoid emissions were dominated by a-pinene (16 %), camphene (20 %), I3-pinene (19 %), and limonene (32 %). Isoprene and monoterpene emission fluxes showed clear diurnal variations, with higher emissions around noon and lower emissions in the morning and late evening. The emission peaks typically occurred several hours after the peak in photosynthetically active radiation (PAR) around noon. Isoprene and monoterpene emissions also varied seasonally. O3 fluxes were negative (downward) and peaked around noon, with the highest fluxes observed in the dry season. BVOC concentrations at the bottom and top levels were higher around noon, and concentrations were higher at the bottom level than at the top level, indicating upward fluxes. O3 concentrations at the bottom and top levels showed clear diurnal variations, with higher values around noon. O3 concentrations at the top level were higher than those at the bottom level. BVOC emissions and ozone flux, along with their concentrations, are correlated with atmospheric conditions including PAR, air temperature (T), and water vapor and appear to be influenced by smoke plumes. The relationships between BVOC emission, ozone flux, atmospheric conditions (represented by S/Q, the ratio of solar scattered radiation to global radiation), and their concentrations and S/Q were investigated. These relationships can be used to better understand and inform strategies for controlling ozone pollution in China and other locations.

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