Morphological and physiological traits related to PM 2.5 reduction capacities in 13 landscaping tree species
With the increasing use of fossil fuels, fine particulate matter (PM<sub>2.5</sub>) is emerging as a serious environmental problem worldwide. In particular, the damage caused by PM<sub>2.5</sub> in urban areas, where industrial complexes and human activities are concentrated, is extremely problematic, posing a threat to human health. Thus, the importance of landscaping trees is increasing because of their ability to reduce PM<sub>2.5</sub>; however, there remains a lack of research on the selection of species and tree management for PM<sub>2.5</sub> reductions. In this study, we quantified and compared the PM<sub>2.5</sub> reduction capacities of 13 major landscaping tree species and analyzed the relationship between the physical and physiological characteristics of each species and PM<sub>2.5</sub> reduction. Results showed that the amount of PM<sub>2.5</sub> reduction differed among species; reduction per leaf area was the highest in <i>Ginkgo biloba</i> (0.127 ± 0.024 μg cm<sup>-2</sup>) and the lowest in <i>Pinus strobus</i> (0.0072 ± 0.0008 μg cm<sup>-2</sup>). Moreover, PM reduction by the broadleaf species (0.085 ± 0.007 μg cm<sup>-2</sup>) was approximately 9.4-fold that by the needleleaf species (0.009 ± 0.001 μg cm<sup>-2</sup>). Correlation analysis revealed that differences in PM<sub>2.5</sub> reduction were described by specific leaf area between species (<i>P</i> = 0.004), and explained by the length of margin per leaf area among individual trees (<i>P</i> < 0.05). Additionally, reduction in PM<sub>2.5</sub> correlated with photosynthetic properties such as maximum assimilation and carboxylation rates, indicating that PM<sub>2.5</sub> is reduced not only by physical but also by physiological processes (<i>P</i> < 0.001). These findings emphasize that for effective reduction in PM<sub>2.5</sub> through landscaping trees, comprehensive consideration of the physical and physiological characteristics of the species is essential in species selection, and that continuous management is also necessary to maintain the active physiological conditions of the trees. Keywords: Human health and well-being, Adaptive and integrated management, Landscape management ID: 3617896
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| Format: | Document biblioteca |
| Language: | English |
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FAO ;
2022
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| Online Access: | https://openknowledge.fao.org/handle/20.500.14283/cc4418en http://www.fao.org/3/cc4418en/cc4418en.pdf |
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