以清洁区为对照,选取不同污染区共有且生长10a以上使用频率较高的树种,2014年及2015年秋季用重量法测定其单位面积滞尘量,对土壤、叶面尘及叶片进行消解后测定重金属的含量,用SPSS对其相关性进行分析。结果表明:10种树种同一高度叶片单位面积滞尘量和平均单位面积滞尘量均表现为工业区>主城区>清洁对照区,6种阔叶树滞尘效果从大到小依次为天竺桂>桂花>大叶女贞>法国梧桐﹥滇朴﹥广玉兰,4种针叶树滞尘能力从大小依次为龙柏>塔柏>柳杉>雪松;无论是阔叶树还是针叶树,“低”位的滞尘量明显高于“高”位,不同树种对金属元素的吸收富集能力不同;植物叶片中Pb,Cu,Cd,Zn痕量可以用来监测大气中Pb,Cu,Cd,Zn的污染。
In comparison with the clean areas,the trees planted more than 10 years ago and used frequently were selected as object in the different pollution areas. This study mensurated the amount of dust per unit area with weight method and heavy metal content of soil,leaf dust and leaf after digestion in summer in 2014 and 2015,the correlation among them was analyzed with SPSS. The results show the amount of dust catching at the same height per unit leaf area or average per unit area of 10 tree species is as follows:industrial area > the main city area > clean control area.The dust catching ability of six broadleaf tree species is Cinnamomum japonicumSieb>Osmanthus fragrans>Ligustrun lucidum Ait >Platanus acerifolia(Ait.)>Magnolia Grandiflora Linn>Celtis kunmingensis Cheng et Hong,blocking effect of conifers from large to small is as follows:Sabina chinensis (L.) Ant.cv.Kaizuca> Sabina chinensis (L.) Ant.cv.Pyramidalis> Cryptomeria japonica (L.f.) D.Don>Cedrus deodara (Roxb.) G.Don;The dust amount in low position was significantly higher than that of the high position whether conifer or broadleaf trees,the enrichment ability of all trees for heavy metals is different;Pb,Cu,Cd and Zn in the leaves of plants can be used to monitor the pollution in the atmosphere.
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