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行道树拦截了近地面大气PM的迁移,被叶面滞留的PM难以重新扬起,从而降低对人类的危害。不同绿化树种的滞尘能力及叶面尘粒径特性有所差异,且树种滞尘受到自身、自然及人为等多种因素的干扰。该试验对阿克苏11种树种叶面尘及自然降尘进行了采集,并对其进行了粒度分布特征分析,得出了其PM2.5、PM10含量,与自然降尘粒度分布进行了相应比较。结果表明:与二球悬铃木、圆冠榆和新疆杨的叶面尘颗粒物附着密度高,滞尘稳定性较强相比之下,沙枣、梨树和槐树叶面尘颗粒物附着密度低;叶面尘PM2.5、PM10含量最高的树种分别为沙枣、葡萄,含量分别为0.68%、3.59%;自然降尘中细小颗粒物所占体积分数较小,而叶面尘中细小颗粒物所占体积分数较大,叶面尘粒径中值表现为工业区>交通枢纽区>居民区>清洁区。自然降尘的粒径中值为清洁区>交通枢纽区>工业区>居民区,二者差异较大。
Road trees intercept the migration of near-surface atmospheric PM, and it is difficult for PM retained by foliage to rise again, thus reducing the harm to human beings. Dust-removing ability and leaf dust particle size characteristics of different afforestation species are different, and tree species dust is disturbed by many factors, such as self, nature and man-made. In the experiment, leaf dust and natural dustfall were collected from 11 tree species in Aksu, and the characteristics of particle size distribution were analyzed. The content of PM2.5 and PM10 was obtained and compared with the natural dust particle size distribution. The results showed that compared with the high attachment density and the high dust stability of the leaf-surface dust particles of Platycladus orientalis, C. sinensis, and Xinjiang poplar, The species with the highest PM2.5 and PM10 contents in surface dust were sand date and grape with content of 0.68% and 3.59% respectively. Larger, leaf dust particle size showed the median industrial area> transport hub> residential area> clean area. The median particle size of natural dustfall is clean area> transport hub> industrial area> residential area, the difference between the two is large.