摘要
Urban greening trees intercept the migration of atmospheric particulate matters near the ground, and it is difficult for the particulate matters trapped by foliage to re-elevate, thus reducing the hafm to humans. The dust-capturing ability and foliar dust size charactetistics of different greening trees are different In addition, the dust capturing of trees is distutbed by many factors such as sel natural and human factors. The foliar dust and natural dustfaJl in 11 common, tree species in Aksu, Northwest China were collected to analyze tihe particle size distribution diacacteristics,and obtain the concentrations of PM^ and PM10. The results showed that Pktanus acenfolia, Populus alba var. pyramidaJis and Uhnus densa. had high foliar dust attachment density and strong particle-capturing capacity,while Elaeagnus angustifoliaL., Pyrns sinldangensis, Sophora japonica L. had low foliar dust attachment density. The foliar PMZ5 and PM10 contents were highest in E. ongustifolia （0.68%） and Vitis vinefcra （3.59%）, tespectively. The volume fraction of fine partides was small in natural dustM and was kige in foliar dust The median of foliar dust particle size followed tiie descending ordei： industrial area 〉 transportation hub area 〉 residential area 〉 clean area; and the median of natural dustfall particle size followed the descending order： dear area 〉 transportation hub area 〉 industrial area 〉 residential area. There was a big difference between the two.
Urban greening trees intercept the migration of atmospheric particulate matters near the ground, and it is difficult for the particulate matters trapped by foliage to re-elevate, thus reducing the harm to humans. The dust-capturing ability and foliar dust size characteristics of different greening trees are different. In addition, the dust capturing of trees is disturbed by many factors such as self, natural and human factors. The foliar dust and natural dustfall in 11 common tree species in Aksu, Northwest China were collected to analyze the particle size distribution characteristics, and obtain the concentrations of PM2.5 and PM10. The results showed that Platanus acerifolia, Populus alba var. pyramidalis and Ulmus densa had high foliar dust attachment density and strong particle-capturing capacity, while Elaeagnus angustifolia L., Pyrus sinkiangensis, Sophora japonica L. had low foliar dust attachment density. The foliar PM2.5 and PM10 contents were highest in E. angustifolia(0.68%) and Vitis vinefera(3.59%), respectively. The volume fraction of fine particles was small in natural dustfall and was large in foliar dust. The median of foliar dust particle size followed the descending order: industrial area > transportation hub area > residential area > clean area; and the median of natural dustfall particle size followed the descending order: clear area > transportation hub area > industrial area > residential area. There was a big difference between the two.
基金
Sponsored by Natural Science Foundation of Xinjiang Uyghur Autonomous Rrgion(2017D01B15)
