本文關(guān)鍵詞：城市森林對(duì)大氣中重金屬的富集特征?　出處：《環(huán)境化學(xué)》2017年02期 　論文類型：期刊論文

  更多相關(guān)文章： 城市森林 重金屬 富集特征

【摘要】：為了探究城市森林不同樹種對(duì)大氣中重金屬的富集能力和分析大氣環(huán)境質(zhì)量狀況,本文以昆明市東三環(huán)邊坡的城市森林為試驗(yàn)區(qū),玉溪市磨盤山國(guó)家森林公園為對(duì)照區(qū),選取兩地區(qū)分布最廣泛的藍(lán)桉、云南松、華山松、圓柏為實(shí)驗(yàn)對(duì)象,通過(guò)測(cè)定植物葉片中的重金屬含量,對(duì)其季節(jié)變化規(guī)律及重金屬元素含量間的相關(guān)性進(jìn)行了分析,結(jié)果表明:(1)植物葉片中重金屬Zn、Cu、Pb、Cd含量(由春到冬)呈先下降后持續(xù)上升的變化趨勢(shì);Zn含量春季處于最高值(120.63 mg·kg-1);其余3種重金屬元素含量冬季達(dá)到最高值.(2)葉片中Cu和Pb含量相關(guān)性極顯著、金屬元素的總含量和Zn、Cd的含量也極顯著相關(guān),其相關(guān)系數(shù)均達(dá)到0.85以上;Zn和Pb含量的相關(guān)性不顯著.大氣中重金屬Pb污染嚴(yán)重的地區(qū)可選擇華山松作為城市主要綠化樹種、Zn污染嚴(yán)重的地區(qū)可選擇藍(lán)桉、Cu污染嚴(yán)重的地區(qū)可選擇圓柏、Cd污染嚴(yán)重的地區(qū)4種植物均可選擇;試驗(yàn)區(qū)的空氣污染等級(jí)達(dá)到了Ⅱ級(jí)污染,屬于輕度污染區(qū),其中春季大氣的綜合污染指數(shù)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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