.png){kind=icon}
.png){kind=icon}
Return
Organ-level dry deposition velocities of PM2.5 on twigs; detached leaves; and defoliated branches of two morphologically contrasting tree species
.png){kind=icon}
OA
AI
Z
X
DOI：10.3389/ffgc.2026.1919370.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
IntroductionAtmospheric PM2.5 poses significant threats to human health and ecosystems. Vegetation serves as a nature-based solution for mitigating PM2.5 pollution. While leaf and branch retention capacities have been extensively studied; the role of twigs remains poorly understood. This study evaluated the dry deposition velocities (Vd) of PM2.5 for twigs; detached leaves; and defoliated branches of Camphora officinarum (broadleaved) and Cedrus deodara (coniferous) under controlled conditions to establish baseline organ-level deposition capacities.MethodsTwig samples were collected from three replicate trees per species. Each twig was divided into intact twig; detached leaves; and defoliated branch. Vd was measured in a sealed smog chamber (0.4 m3) at 25°C; 50% relative humidity; and 0.3 m s−1 wind speed using ammonium sulfate particles (500 μg m−3).ResultsFor C. officinarum; defoliated branches exhibited the highest Vd (3.16 ± 0.76 cm s−1); followed by detached leaves (0.68 ± 0.10 cm s−1) and intact twigs (0.60 ± 0.16 cm s−1). A similar pattern was observed for C. deodara; with defoliated branches showing the highest Vd (21.18 ± 8.11 cm s−1); followed by detached leaves (1.89 ± 0.95 cm s−1) and intact twigs (0.61 ± 0.17 cm s−1). Branches had significantly higher Vd than leaves and twigs within both species (p < 0.01 for both). C. deodara exhibited significantly higher Vd than C. officinarum for branches (p = 0.018) and leaves (p = 0.049). The surface-area-to-enveloped-space ratio was higher for C. deodara (1.40 ± 0.02 cm−1) than C. officinarum (0.61 ± 0.02 cm−1) (p < 0.001).DiscussionDefoliated branches exhibited the highest organ-level Vd; followed by detached leaves and twigs. C. deodara showed higher Vd than C. officinarum. However; these findings represent baseline organ-level capacities rather than whole-plant performance; providing foundational insights for future canopy-scale studies.
Keywords:
phytoremediation
canopy architecture
fine particulate matter (PM2.5)
Camphora officinarum
Cedrus deodara
dry deposition velocity (Vd)
Journal
F
IF:
3.2
Papers:
373
Citations:
4.0K
Organization
Cited Papers