Preprints
https://doi.org/10.5194/egusphere-2025-3226
https://doi.org/10.5194/egusphere-2025-3226
17 Jul 2025
 | 17 Jul 2025

Measurement report: Age-dependent BVOC emissions in Eucalyptus urophylla: a comparison of leaf cuvette and branch chamber measurements

Xiao Tian, Jianqiang Zeng, Yanli Zhang, Weihua Pang, Yuting Lu, Haofan Ran, Hao Guo, Zhaobin Mu, Wei Song, and Xinming Wang

Abstract. Biogenic volatile organic compound (BVOC) emission factors (Es) underpin air quality and climate models, yet current databases intermingle data from both seedlings and mature trees and from two enclosure techniques, leaf cuvettes and dynamic branch chambers, whose comparability has rarely been rigorously tested. Here we quantified BVOC emissions from Eucalyptus urophylla by pairing the two methods on a statistically representative number of 2-month-old seedlings in the laboratory and 2-year-old trees measured at a managed plantations in subtropical China. Leaf-cuvette and branch-chamber determination of isoprene Es matched within 5 % for both age classes, demonstrating method equivalence. In contrast, tree age exerted a significant impact on both the magnitude and speciation of emissions. Seedlings emitted ~50 % more isoprene and were enriched in cyclic monoterpenes like α-pinene and 1,8-cineole, whereas field-grown trees shifted toward highly reactive acyclic monoterpenes, with β-ocimenes accounted for over 85 % of the terpene flux. These ontogenetic shifts imply that one-third of the entries in global Es compilations, which are derived from seedling studies, likely overestimate local isoprene fluxes while under-representing the atmospheric reactivity of mature canopies. Our results validate the use of either chamber type for measuring isoprene Es, highlight the need for improved analytical sensitivity before extending this equivalence to terpenes, and call for systematic, large-sample, branch-level measurements of adult trees to produce representative Es values. Incorporating age-resolved emission factors into models will refine estimates of ozone and secondary organic aerosol formation in fast-growing subtropical plantations and other managed forests worldwide.

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Xiao Tian, Jianqiang Zeng, Yanli Zhang, Weihua Pang, Yuting Lu, Haofan Ran, Hao Guo, Zhaobin Mu, Wei Song, and Xinming Wang

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-3226', Anonymous Referee #1, 30 Jul 2025
  • RC2: 'Comment on egusphere-2025-3226', Anonymous Referee #2, 04 Sep 2025
Xiao Tian, Jianqiang Zeng, Yanli Zhang, Weihua Pang, Yuting Lu, Haofan Ran, Hao Guo, Zhaobin Mu, Wei Song, and Xinming Wang

Data sets

Measurement report: Age‑dependent BVOC emissions in Eucalyptus urophylla: a comparison of leaf‑cuvette and branch‑chamber measurements Jianqiang Zeng https://doi.org/10.17632/jw8g8gkm5t.1

Xiao Tian, Jianqiang Zeng, Yanli Zhang, Weihua Pang, Yuting Lu, Haofan Ran, Hao Guo, Zhaobin Mu, Wei Song, and Xinming Wang

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Short summary
This study measured a statistically representative number of 2-month-old and 2-year-old eucalyptus trees using both leaf cuvettes and dynamic branch chambers. It demonstrated equivalent isoprene results between the two enclosure methods, yet contrasting emission magnitude and speciation among age groups. Current seedling- and adult-tree-mixed emission factor databases may thus misjudge ozone and secondary organic aerosol simulation, thus age-resolved data will improve air quality forecasts.
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