城市森林对大气中重金属的富集特征

发布时间：2018-01-08 05:13

  本文关键词：城市森林对大气中重金属的富集特征?　出处：《环境化学》2017年02期 　论文类型：期刊论文

  更多相关文章： 城市森林 重金属 富集特征

【摘要】：为了探究城市森林不同树种对大气中重金属的富集能力和分析大气环境质量状况,本文以昆明市东三环边坡的城市森林为试验区,玉溪市磨盘山国家森林公园为对照区,选取两地区分布最广泛的蓝桉、云南松、华山松、圆柏为实验对象,通过测定植物叶片中的重金属含量,对其季节变化规律及重金属元素含量间的相关性进行了分析,结果表明:(1)植物叶片中重金属Zn、Cu、Pb、Cd含量(由春到冬)呈先下降后持续上升的变化趋势;Zn含量春季处于最高值(120.63 mg·kg-1);其余3种重金属元素含量冬季达到最高值.(2)叶片中Cu和Pb含量相关性极显著、金属元素的总含量和Zn、Cd的含量也极显著相关,其相关系数均达到0.85以上;Zn和Pb含量的相关性不显著.大气中重金属Pb污染严重的地区可选择华山松作为城市主要绿化树种、Zn污染严重的地区可选择蓝桉、Cu污染严重的地区可选择圆柏、Cd污染严重的地区4种植物均可选择;试验区的空气污染等级达到了Ⅱ级污染,属于轻度污染区,其中春季大气的综合污染指数最高.
[Abstract]:In order to study the enrichment of heavy metals in the atmosphere by different tree species in urban forest and to analyze the quality of atmospheric environment, this paper takes the urban forest of east third ring slope of Kunming as the experimental area. The most widely distributed Eucalyptus globulus, Pinus yunnanensis, Pinus huashanensis and Cypress were selected as the control area in Mopanshan National Forest Park of Yuxi City. The heavy metal contents in plant leaves were determined. The seasonal variation law and the correlation between heavy metal contents were analyzed. The results showed that the heavy metal Zn ~ (2 +) Cu ~ (2 +) Pb was found in the leaves of the plant. CD content (from spring to winter) decreased first and then increased continuously. Zn content was at the highest value of 120.63 mg 路kg ~ (-1) in spring. The contents of Cu and Pb in leaves reached the highest value in winter, and the total content of metal elements and the content of Zn ~ (2 +) CD were also significantly correlated. The correlation coefficient is above 0.85; The correlation between Zn and Pb content was not significant. In the areas with serious heavy metal Pb pollution, Pinus huashanensis could be selected as the main urban greening tree, and the area with serious Zn pollution could be selected as Eucalyptus globulus. Four species of plants can be selected in areas with serious Cu pollution. The level of air pollution in the experimental area reached class 鈪，

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