摘要
应用TAS-990原子吸收分光光度计测定乌鲁木齐市17种主要绿化树种的叶片Pb、Cd含量,运用ANOVA单因素方差的LSD多重比较不同植物叶片中重金属含量的差异,结合截距法和类平均法(聚类分析),并初步筛选出一批Pb、Cd积累能力强的树木。结果表明:绿化树种对Pb吸收量高的树木有桑树、桃树、黄金树,分别为12.35mg·kg-1、10.62mg·kg-1、10.31mg·kg-1,可作为Pb污染地区的绿化树种;对Cd吸收量高的树木有新疆杨、桑树和复叶槭,分别为0.76mg·kg-1、0.71mg·kg-1和0.51mg·kg-1,可作为Cd污染地区的绿化树种。同一树种Pb的积累比Cd的积累较高。推测乌鲁木齐市空气中Pb为主要空气污染物之一,而Cd不是该市主要的空气污染物。
In this work,TAS- 990 atomic absorption spectrophotometer was used to determine the content of Pb and Cd in leaves of 17 garden tree species from the urban areas of Urumqi City. Oneway ANOVA followed by LSD multiple comparisons was performed to compare the leave＇s heavy metal content in different tree species.Intercept and group average method（ cluster analysis） were then applied to screen out a set of tree species with high Pb and Cd accumulation abilities. Our results revealed that the trees did have certain ability to absorb and purify the two pollutants. However,the abilities varied according to tree species and different pollutant gases.The trees that have the highest Pb- uptake ability are Morus alba L.,Juglans regia L.,and Catalpa spciosa（ 12.35mg·kg^- 1,10.62mg·kg^- 1,and 10.31mg·kg^- 1,respectively）,thus,they can be as a key tree species in Pbpolluted areas. The trees that have the highest Cduptake ability are Populus bolleana,Morus alba L. and Acer negundo（ 0. 76mg·kg^-1,0.71mg·kg^-1,and 0.51mg·kg^-1,respectively）,which are suitable for growing in Cdpolluted areas. The accumulation of Pb among same species is higher that the accumulation of Cd. All in all,we concluded that Pb as one of the major air pollutants in Urumqi.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2014年第12期143-147,共5页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目"干旱区绿洲城市主要园林树种滞尘效应及耐尘机制研究"(31270742)
国家自然科学基金项目"荒漠生态修复区风蚀过程及天然河岸林防风阻沙效应研究"(31360200)资助
