Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China.
Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China; Guangdong Provincial Observation and Research Station for Atmospheric Environment and Carbon Neutrality in Nanling Forests, China; Australia-China Centre for Air Quality Science and Management (Guangdong), Guangzhou 511443, China.
J Environ Sci (China). 2025 Feb;148:665-682. doi: 10.1016/j.jes.2023.09.041. Epub 2023 Oct 13.
Emission characteristics of biogenic volatile organic compounds (BVOCs) from dominant tree species in the subtropical pristine forests of China are extremely limited. Here we conducted in situ field measurements of BVOCs emissions from representative mature evergreen trees by using dynamic branch enclosures at four altitude gradients (600-1690 m a.s.l.) in the Nanling Mountains of southern China. Composition characteristics as well as seasonal and altitudinal variations were analyzed. Standardized emission rates and canopy-scale emission factors were then calculated. Results showed that BVOCs emission intensities in the wet season were generally higher than those in the dry season. Monoterpenes were the dominant BVOCs emitted from most broad-leaved trees, accounting for over 70% of the total. Schima superba, Yushania basihirsuta and Altingia chinensis had relatively high emission intensities and secondary pollutant formation potentials. The localized emission factors of isoprene were comparable to the defaults in the Model of Emissions of Gases and Aerosols from Nature (MEGAN), while emission factors of monoterpenes and sesquiterpenes were 2 to 58 times of those in the model. Our results can be used to update the current BVOCs emission inventory in MEGAN, thereby reducing the uncertainties of BVOCs emission estimations in forested regions of southern China.
中国亚热带原始森林中主要树种的生源挥发性有机化合物（BVOCs）排放特征极其有限。本研究采用动态树干密闭系统，在中国南方南岭山脉的四个海拔梯度（600-1690 米）上对代表性成熟常绿树种的 BVOCs 排放进行了原位野外测量。分析了组成特征以及季节和海拔变化。然后计算了标准化排放率和冠层尺度排放因子。结果表明，雨季的 BVOCs 排放强度普遍高于旱季。大多数阔叶树种以单萜为主，占总量的 70%以上。木荷、伯乐树和银钟花具有相对较高的排放强度和二次污染物形成潜力。异戊二烯的本地化排放因子与自然排放气体和气溶胶模型（MEGAN）中的缺省值相当，而单萜和倍半萜的排放因子是模型中的 2 至 58 倍。我们的研究结果可用于更新 MEGAN 中当前的 BVOCs 排放清单，从而减少中国南方森林地区 BVOCs 排放估算的不确定性。
