安徽农业科学
安徽農業科學
안휘농업과학
JOURNAL OF ANHUI AGRICULTURAL SCIENCES
2009年
35期
17725-17729
,共5页
树木年轮%重金属元素%环境背景%环境污染%动态变化
樹木年輪%重金屬元素%環境揹景%環境汙染%動態變化
수목년륜%중금속원소%배경배경%배경오염%동태변화
Tree ring%Heavy metal%Growth background%Environmental pollution%Historical change
[目的]弄清南京市城市主干道重金属元素污染状况的动态变化,为南京市环境重金属元素污染防治提供科学依据.[方法]对南京市区主要城市干道行道树和作为对照组的南京林业大学校园内的雪松、法国梧桐和水杉3个对应树种树木年轮重金属元素Cd、Cr、Cu、Fe、Mn、Ni、Pb、Ti、Zn含量进行了测试和对比分析.[结果]分析发现,自20世纪60年代以来,南京市行道树年轮重金属元素含量均呈现出明显的上升趋势,且上升速度在近几个年轮段时期内明显加快.对比还发现,校园组树木年轮重金属元素含量明显低于行道树组,且上升速度大大低于行道树组,甚至校园组某些元素含量随时间无明显的上升趋势.这说明南京市交通主干道的重金属元素污染程度和污染的上升速度明显高于非交通干道区域,这一快速上升的特点与南京市机动车拥有量快速增长相一致.[结论]研究得出,机动车暴发式增长是造成南京市主干道重金属元素污染的主要原因.
[目的]弄清南京市城市主榦道重金屬元素汙染狀況的動態變化,為南京市環境重金屬元素汙染防治提供科學依據.[方法]對南京市區主要城市榦道行道樹和作為對照組的南京林業大學校園內的雪鬆、法國梧桐和水杉3箇對應樹種樹木年輪重金屬元素Cd、Cr、Cu、Fe、Mn、Ni、Pb、Ti、Zn含量進行瞭測試和對比分析.[結果]分析髮現,自20世紀60年代以來,南京市行道樹年輪重金屬元素含量均呈現齣明顯的上升趨勢,且上升速度在近幾箇年輪段時期內明顯加快.對比還髮現,校園組樹木年輪重金屬元素含量明顯低于行道樹組,且上升速度大大低于行道樹組,甚至校園組某些元素含量隨時間無明顯的上升趨勢.這說明南京市交通主榦道的重金屬元素汙染程度和汙染的上升速度明顯高于非交通榦道區域,這一快速上升的特點與南京市機動車擁有量快速增長相一緻.[結論]研究得齣,機動車暴髮式增長是造成南京市主榦道重金屬元素汙染的主要原因.
[목적]롱청남경시성시주간도중금속원소오염상황적동태변화,위남경시배경중금속원소오염방치제공과학의거.[방법]대남경시구주요성시간도행도수화작위대조조적남경임업대학교완내적설송、법국오동화수삼3개대응수충수목년륜중금속원소Cd、Cr、Cu、Fe、Mn、Ni、Pb、Ti、Zn함량진행료측시화대비분석.[결과]분석발현,자20세기60년대이래,남경시행도수년륜중금속원소함량균정현출명현적상승추세,차상승속도재근궤개년륜단시기내명현가쾌.대비환발현,교완조수목년륜중금속원소함량명현저우행도수조,차상승속도대대저우행도수조,심지교완조모사원소함량수시간무명현적상승추세.저설명남경시교통주간도적중금속원소오염정도화오염적상승속도명현고우비교통간도구역,저일쾌속상승적특점여남경시궤동차옹유량쾌속증장상일치.[결론]연구득출,궤동차폭발식증장시조성남경시주간도중금속원소오염적주요원인.
[Objective] The scientific reference for the control of heavy metal population in Nanjing was provided through the clarification of the dynamic variation of the heavy metal population in major urban road system. [Method] The content of the heavy metal element: Cd, Cr, Cu, Fe, Mn, Ni, Pb, Ti and Zn in tree rings in both two growth backgrounds: major urban road system and campus in Nanjing were examined and analyzed. [Results] It was found that the contents of heavy metal in tree rings of different tree species grown along urban road in Nanjing had been obviously rising since the 1960's and the increment of the content of the heavy metals in last tree rings was significantly sped up. It was also found that both the content of heavy metal and its increment speed in tree rings in major urban road system were much higher than these in campus and the content of some heavy metals in tree ring in campus had been not increased with the time-lasting. It was showed that the pollution of heavy metals in major urban road was much higher than that in campus, which was correspondent with the rapid growth of motor vehicles in Nanjing. [Conclusion] It was suggested that the total amount of motor vehicles in Nanjing might be the main factor leading to the heavy metal pollution in the city.
