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The leaf microstructure of different trees and its impact on air particlescapturing ability.

ZHANG Wei-kang1,2, WANG Bing1,3, NIU Xiang1,3*#br#   

  1. (1Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; 
    2College of Forestry, Shenyang Agricultural University, Shenyang 110866, China; 3Beijing Collaborative Innovation Center for Ecoenvironmental Improvement with Forestry and Fruit Trees, Beijing 102206, China).
  • Online:2017-09-10 Published:2017-09-10

Abstract:

Particulate matter (PM), including PM10 and PM2.5, is one of the major pollutants impacting air quality and public health. Trees can capture the particles and improve the air quality. In this study, we used Atomic Force Microscopy and Scanning Electron Microscope to investigate the leaf surface micromorphological characters of trees in different sites of Beijing, and analyzed the influence of the leaf microstructure of different tree species on capturing air particulate matter. The results showed that different trees had different abilities to capture particles. Coniferous species were found to capture more particles than did broadleaf trees. The particlescapturing ability of leaves was significantly influenced by leaf microstructure (P<0.05). For Pinus tabuliformis and P. bungeana, the particlescapturing ability was mainly impacted by stomatal density, the thickness of waxy layer, epidermis and texture, while leaf roughness was the major factor for other trees, including Salix matsudana, Acer truncatum, Ginkgo biloba, and Populus tomentosa. Leaf surface wettability was negatively correlated to particlescapturing ability (P<0.05).
 

Key words: broad-leaved Korean pine forest in Changbai Mountains, nitrogen deposition, precipitation change, soil nitrogen cycle, microbial functional diversity.