title: [Relationships between leaf surface characteristics and dust-capturing capability of urban greening plant species].
abstract: Taking 21 representative urban greening species in Xi' an as test objects, their leaf dust-capturing capability was determined by artificial dust-deposition method, and the relationships between the dust-capturing capability and leaf surface features, e.g., trichomes, wettability, surface free energy and its polar and dispersive components on dust-capturing capability were studied. For the tested 21 species, their maximum leaf dust-capturing capability was 0.8-38.6 g x m(-2), and there was a significant difference among them, with the greatest varoiation up to forty times. The amount, distribution, and morphology of trichomes had great influence on the leaf dust-capturing capability, possibly due to the different action patterns between trichomes and particulate matters. There was a significant negative relationship between leaf contact angle and maximum leaf dust-capturing capability (r = -0.523), except for four species whose leaf surface has trichomes. For wettable leaves, their maximum dust-capturing capacity ranged from 2.0 to 8.0 g x m(-2), but for nonwettable leaves, their maximum dust-capturing capacity was below 2.0 g x m(-2). The leaf surface free energy was mainly manifested in the action of dispersive component while contribution of polar free energy was lower than 20%, which could be related to the existence of non-polar or weakly polar substances on leaf surface. The leaf surface free energy and its dispersive component had a significant positive correlation (r = 0.500, 0.572) with the maximum leaf dust-capturing capability, but the positive correlation between polar free energy and maximum dust-capturing capability was not significant (r = 0.244).
authors: School of Environmental and Municipal Engineering, Xi' an University of Architecture and Technology, Xi' an 710055, China. dasenlin-80@163.com
authors: Hui-xia
authors: HX
authors: Wang
authors: Hui
authors: H
authors: Shi
authors: Yang-yang
authors: YY
authors: Li
mesh_terms: D000397:Air Pollution / Q000517:prevention & control*; D001673:Biodegradation, Environmental; D002947:Cities; D004391:Dust / Q000032:analysis*; D018515:Plant Leaves / Q000033:anatomy & histology / Q000502:physiology*; D013045:Species Specificity; D013499:Surface Properties; D014197:Trees / Q000502:physiology*
chemical_list: D004391:Dust