大庆市6种绿化树种对SO2、NO2的消减及滞尘效应

城市森林在吸收、滞留大气污染物，改善城市生态环境方面具有重要意义。以大庆市6种常见绿化树种为研究对象，采用水洗-滤膜法和熏气试验探究不同树种对总悬浮颗粒物(TSP)、大颗粒物(PM_>10)、粗颗粒物(PM_3—10)和细颗粒物(PM_1—3)的滞留规律以及对大气中SO₂、NO₂的消减效果。研究结果表明：(1)不同树种的滞尘能力差异显著(P<0.05),对TSP的滞留量从大到小依次为：油松(3.82±0.40)g/m²>红瑞木(1.45±0.12)g/m²>紫丁香(1.22±0.17)g/m²>梣叶槭(1.21±0.13)g/m²>大叶杨(0.93±0.17)g/m²>旱柳(0.54±0.14)g/m²;(2)树种间对不同颗粒物的滞留量具有显著差异(P<0.05),供试树种对不同粒径颗粒物滞留的质量占比表现...

Dust-retention and reduce to SO2 and NO2 by 6 landscape trees in Daqing

Urban forest has practical significance in absorbing air pollutants and improving urban ecological environment. Taking six common greening tree species in Daqing City as the research object, the retention law of different plants on different particle sizes, including total suspended particulate (TSP), large particles (PM_>10), coarse particle (PM_3-10), fine particulate (PM_1-3) and the reduction of SO₂ and NO₂ in the atmosphere were studied by water washing-filtration membrane and artificial simulated fumigation method. The results showed that the significant differences in dust retention capacity among different tree species (P<0.05). (1) The retention of TSP in descending order is Pinus tabuliformis Carr. (3.82±0.40)g/m² > Swida alba Opiz. (1.45±0.12)g/m² > Syringa oblata Lindl. (1.22±0.17)g/m² > Acer negundo Lindl. (1.21±0.13)g/m² > Populus lasiocarpa Oliv. (0.93±0.17)g/m² > Salix matsudana Koidz. (0.54±0.14)g/m². (2) Different tree species had significant differences in retention of different particles (P<0.05).The mass proportion of particles with different particle sizes retained by the tested tree species was as follows:PM_>10(62.33%-83.68%),PM_3-10(10.82%-21.41%),PM_1-3(4.05%-18.30%). (3)The dust retention of Swida alba Opiz., Syringa oblata Lindl. and Acer negundo Lindl. was positively correlated with the absorbency to SO₂ and NO₂. (4) The comprehensive dust retention ability and absorbency to SO₂ and NO₂ of Swida alba Opiz., Syringa oblata Lindl. and Populus lasiocarpa Oliv. were stronger. Therefore, Swida alba Opiz., Syringa oblata Lindl. and Populus lasiocarpa Oliv. can be preferred for urban greening. In the planning of landscape plants, the tree species should be given priority to those with shrubs and herbs, and make full use of three-dimensional space to maximize the dust retention effect. At the same time, evergreen tree species suitable for northern growth should also be introduced or cultivated to strengthen the retention effect of atmospheric particles in winter.