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Bulletin of Botanical Research ›› 2018, Vol. 38 ›› Issue (3): 444-452.doi: 10.7525/j.issn.1673-5102.2018.03.017

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Effects of Foliar Trichomes on the Retention and Resuspension of Atmospheric Particulates:in the Case of Tillandsia velutina

ZHANG Wei, ZHANG Rui-Wen, ZHENG Gui-Ling, LI Peng   

  1. College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109
  • Received:2017-09-27 Online:2018-05-15 Published:2018-05-17
  • Supported by:
    This work was supported by the National Natural Science Foundation(41571472)

Abstract: Foliar trichomes are the specialized structures getting in touch with atmospheric particles firstly. However, effects of foliar trichomes on particulate retention have not been investigated until now. So epiphytic Tillandsia velutina with typical foliar trichomes was selected as materials, and its trichomes were removed artificially to investigate the particulate retention and resuspension under different wind strengths and operation time. The maximum(23.24±0.11 g·m-2) and the natural particle retention contents(10.22±0.92 g·m-2) with all the foliar trichomes were significantly higher than those without foliar trichomes(P<0.05). After the atmospheric particles deposited on the leaf surface, more than 99.0% dust was blown away by the wind in the plants without trichomes, while the proportion was only 28.1% for those plants with trichomes. Moreover, more folair trichomes were removed, more particles were resuspended. Therefore, the effects of foliar trichomes of T. velutina on the retention and resuspension of atmospheric particulates was reflected not only in the total amount of atmospheric particulates, but also in the process of atmospheric particulate resuspension. Foliar trichomes would decrease the resuspension of the atmospheric particles descending on the leave surface, and promote the retention of these particles.

Key words: air plant, air pollution, foliar trichome, resuspension

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