Biogenic emission profile of volatile organic compounds from poplar, sweetgum, and pine trees
LI Ling-yu1, Alex B. Guenther2, GU Da-sa2,3, Roger Seco2, Sanjeevi Nagalingam2
1. College of Environmental Sciences and Engineering, Qingdao University, Qingdao 266071, China;
2. Department of Earth System Science, University of California, Irvine, California 92697, USA;
3. Division of Environment and Sustainability, Hong Kong University of Science and Technology, Hong Kong 999077, China
In order to study the characteristics of biogenic volatile organic compounds (BVOCs) emission from typical trees and obtain their basic emission rates for each BVOC compound, a dynamic enclosed system was used to conduct laboratory measurements on poplar, sweetgum, and pine trees. BVOC compounds including isoprene, monoterpenes, sesquiterpenes, alkanes, and alkenes were analyzed by TD-GC-TOFMS. The normalized species-specific BVOC emission rates of three tree species were calculated and their emission profiles were investigated. The total BVOC emission rates of Populus trichocarpa, Liquidambar styraciflua, and Pinus massoniana were 19.51, 7.19, and 0.67μg/(g·h) (2086.91, 562.35, and 104.03μg/(m2·h)), respectively. Populus trichocarpa had the highest isoprene emission rate of 18.51μg/(g·h), contributing 94.86% to the total BVOC emissions. Pinus massoniana had a lower isoprene contribution (4.03%), but the highest monoterpenes contribution (49.09%. Liquidambar styraciflua had the highest monoterpenes emission rate of 0.84μg/(g·h). Sesquiterpenes contributed less than 1.5% to the total BVOC emissions for the three plants. The emission rates of alkanes for each tree species were generally higher than those of sesquiterpenes, and some were even higher than those of isoprene and monoterpenes. Trans-β-ocimene was the predominated monoterpene for Populus trichocarpa, accounting for 99.84% of its total monoterpene emissions. The monoterpenes emitted by Liquidambar styraciflua.was mainly composed by Sabinene and β-pinene. α-Pinene, sabinene, and β-pinene were observed as the dominated monoterpenes for Pinus massoniana. Trans-caryophyllene, humulene, δ-cadinene, and β-guaiene were prominent sesquiterpenes. Alkanes emitted from the three plants were mainly C4 and C5 compounds, of which particularly were isobutane and butane. 1-Butene was the most abundant alkene for all plants.
李玲玉, Alex B. Guenther, 顾达萨, Roger Seco, Sanjeevi Nagalingam. 典型树种挥发性有机物(VOCs)排放成分谱及排放特征[J]. 中国环境科学, 2019, 39(12): 4966-4973.
LI Ling-yu, Alex B. Guenther, GU Da-sa, Roger Seco, Sanjeevi Nagalingam. Biogenic emission profile of volatile organic compounds from poplar, sweetgum, and pine trees. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(12): 4966-4973.
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