保定市几种常见绿化树种叶片滞尘能力研究

Study on leaf dust-retaining effect of common greening trees in Baoding City

为了揭示保定市常见绿化树种的滞尘规律,选择校园和交通干道2个功能区的9种绿化树木进行叶片滞尘能力的研究,结果表明:不同树种的滞尘能力差异极显著,法桐、构树、大叶黄杨滞尘能力较高,12d的滞尘量分别为10.071 1g/m2、8.820 2g/m2、7.653 5g/m2,碧桃、紫荆、紫丁香滞尘能力居中;楸树、紫叶李、加杨的滞尘能力较低,加杨的滞尘量最小,仅为1.053 4g/m2;不同研究区植物滞尘能力也存在显著差异,南二环树木的滞尘量远高于校园内树木的滞尘量,法桐、大叶黄杨在南二环的滞尘量分别是校园的7.9倍和6.7倍,紫叶李在南二环滞尘量甚至是校园的14.9倍;比较不同树种在4d、7d、12d内的日均滞尘量发现,随着时间的推移,植物滞尘能力越来越小。总之,可以优先考虑选择法桐、构树、大叶黄杨作为保定市的绿化树种。

In order to reveal the effect of commom greening trees on dust retention in Baoding City,the differences in foliar dust retention among nine species planted in both street and campus were analyzed.The results showed that there were significant differences in dust retention among different species.Species with the strongest dust capacity during two weeks were Platanus orientalis,Broussonetia papyrifera.and Euonymus japonicus,which could reach 10.071 1g/m2,8.820 2g/m2,7.653 5g/m2,respectively.Species including Amygdalus persicaf.duplex,Cercis chinensis and Syringa oblata had better dust-retaining abality than species including Catalpa bungei,Prunus cerasifera f.atropurpurea and Populus×canadensis,and the lowest value of 1.053 4g/m2 was recorded in Populus×canadensis.The significant differences in dust removel effect were also found in different areas.The amount of dust absorption of species planted in street was considerably higher than in campus,which were 7.9and 6.7times as high as in campus for Platanus orientalis,and Broussonetia papyrifera,and even 14.9times for Prunus cerasifera f.atropurpurea.It was also found that the dust retention capacity of trees decreased through time by the comparison of daily dust retention during 4,7and 12 days.In conclusion,it is advisable to consider choosing tree species like Platanus orientalis,Broussonetia papyrifera and Euonymus japonicus as greening trees in Baoding City.