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以交通繁忙区(污染点)和相对清洁区(对照点)道路两侧的香樟(Cinnamomum camphora(L.)Presl.)为研究对象,测定了不同器官(包括主干、老树皮、2年生枝条、1年生枝条、叶片和果实)中重金属元素(Pb、Cd、Zn、Cu、As、Ni)的含量,并对污染点香樟各器官中6种重金属元素的累积量和污染指数及二者的分布比例进行分析。研究结果表明:香樟体内重金属元素的含量因样点、器官及重金属元素的不同而呈现不同的变化规律,污染点6种重金属元素的累积量及其分布比例、污染指数及其分布比例则因器官和元素的不同而有明显差异。总体上看,污染点各器官的Pb、Cd、Zn、Cu、As和Ni含量均高于对照点,且差异显著(P<0.05);6种重金属元素相比较,均以Zn含量最高,Cu含量次之,而Pb、As、Ni含量较低;在不同器官中同一重金属元素的含量也有明显差异,其中,2年生枝条中的Pb、Cu和As含量最高,老树皮中Cd和Ni含量最高,一年生枝条中的Zn含量最高。各重金属元素的累积量及其分布比例均以叶片最高,其次为老树皮;而各重金属元素的污染指数及其分布比例:Pb和Zn以叶片最高,老树皮次之;其他4种重金属元素以老树皮为最,叶片次之。研究结果显示:香樟各器官对空气中的重金属元素均有一定的吸附能力,并且叶片和老树皮的吸附能力明显优于其他器官,能很好地指示空气中的重金属污染。
Cinnamomum camphora (L.) Presl.) On both sides of the road in the heavy traffic area (pollution point) and the relatively clean area (control point) was used as the research object to measure the growth of different organs (including trunk, bark, (Pb, Cd, Zn, Cu, As and Ni) in different organs of Cinnamomum camphora and the pollution index of six heavy metal elements The distribution of the proportion of people to analyze. The results showed that the contents of heavy metal elements in Campanula were different due to different sampling points, organs and heavy metal elements, the cumulative amount of six kinds of heavy metal elements in the polluted area and the proportion of their distribution, There are obvious differences between organs and elements. In general, the contents of Pb, Cd, Zn, Cu, As and Ni in all organs at the contaminated sites were significantly higher than those at the control sites (P <0.05). The contents of Zn, Cu The contents of Pb, As and Ni were lower. The contents of Pb, Cu and As in the two-year-old branches were the highest, and the content of Cd and Ni in the old bark Highest, annual Zn in the highest branches. The accumulation of heavy metal elements and its distribution ratio were the highest leaves, followed by the old bark; and the pollution index of heavy metals and its distribution ratio: Pb and Zn leaves the highest, followed by the old bark; the other four kinds of heavy metals Elements of the old bark for the most, followed by leaves. The results showed that all the camphor organs had certain adsorption capacity to heavy metal elements in the air, and the adsorption capacity of leaves and old bark was better than other organs, which could well indicate the heavy metal pollution in the air.