| The air pollution was more widely studied, using lives as biomonitors. Leaves’monitoring on heavy metals by its heavy metal contents is an important part ofleavees’ monitoring factors, which is the most common applied. But in the existingstudied, there is no refer to REE and other trace elements, and there is only onevergreen tree leaves monitoring air pollution.The Ginkgo tree L. which is the mainafforestation tree in Chengdu were studied in the control area (Mianzhu qingpingtownship of ginkgo biloba ditch) and the study area (Xiashahe bus station, Chengduuniversity of technology, Chengbei stadium). By measured the trace metal contents inthe ginkgo leaves and the soil, studied their effect of indicating of air pollution, andpreliminarily studied the sources of heavy metal contents of the ginkgo leaves. Themain conclusions of this study can be summed up as follows:1）Compared to China and Sichuan soil background value, the results showedthat the control area (qingping township of ginkgo biloba gap) and chengdu universityof technology, chengbei stadium significantly higher content of rare earth elements insoil.2）Compared to China and Chengdu soil background value, the results showedthat soil at each sampling point has been more or less heavy metals pollution. Inaddition, this article through one-way pollution index method to evaluate the specificsituation of the soil heavy metal pollution, at each sampling results found Xiashahebus station under the sampling points around the soil heavy metal pollution degree isthe lightest, PCr>3only, has reached high levels of pollution levels and chengduuniversity of technology, chengbei stadium is heaviest pollution. Chengdu institute oftechnology (university of Cr, Pb and Cu in the soil of three element has reached highlevels of pollution level, the pollution index of PCr respectively=PPb=3.564, PCu=3.687and4.128, and Cd (2.456), zinc (2.472) two elements of pollution indexbetween2-3, to achieve high levels of pollution levels; the As (1.037), Co (1.665), Ni(1.807), V (1.602) of the four elements pollution index between1and2, lightpollution level. The north stadium is the most serious pollution Pb (5.123), Cu (5.495), zinc (4.812) of three elements, the pollution index is close to or higher than5, Cd, V,two elements of pollution index is slightly higher than3, the five elements havereached high levels of pollution levels; Cr (2.432), Ni (2.311) two elements ofpollution index between2and3, were moderately polluted; the As (1.128), Co (1.887)two elements is slightly polluted. And the control of the area, the city of mianzhuqingping township has also been part of soil heavy metal pollution, which mostserious pollution is Cd (4.052), Pb (3.222), Ni (3.715) of three elements, have reachedhigh levels of pollution levels; Cr element (2.160) were moderately polluted, and Co(1.76) element is light pollution.3）Compared to China and Sichuan soil background value, the results showedthat chengdu university of technology, chengbei stadium Mn in the soil, Bi, Sb, Sr, Th,Ti, U, Y of eight kinds of element content is more than the background value, Feelement is the exception, and shahe shop bus station under all other trace elementscontent in soil is lower than the background value. As the study of the control area,qingping township of ginkgo biloba gap Mn in the soil, Bi, Th, Ti, U and Y of the sixelements content more than soil background values.qingping township of ginkgobiloba ditch Mn in the soil, Bi, Th, Ti, U, Y of the six elements content is more thansoil background value, especially the Mn, Ti, U and Y four elements, higher than thatof downtown chengdu three sampling points.4）The patterns of distribution of rare earth elements in soil is consistent, explainsthat the nature of the soil and constitute is almost the same. But the patterns ofdistribution of rare earth elements in ginkgo biloba are differdent, which proved thatchoose ginkgo biloba monitoring air pollution was effective.5) The results of the PEARSON function of SPSS analysis of heavy metalelements in ginkgo biloba leaves and the correlation between total rare earth foundxiashahepu bus station, chengdu university of technology, chengbei stadium Aselements in ginkgo biloba leaves and has a good correlation between total rare earth,EXCEL the x-y scatterplot drawings found the sample point in ginkgo biloba As, Cd,Pb, Ni, with recent five elements and has a good correlation between total rare earth;Through biological availability of heavy metals in the soil were analyzed, and foundthat the chengdu city three sample point atmospheric heavy metal pollution situationis different, the extract of shahe shop bus station under the Cr, Co, two kinds of heavymetal elements and relationship of corresponding element in ginkgo biloba is poorer,extract of chengdu university of technology had no significant correlation betweentwo kinds of heavy metal elements Pb, V, and chengbei stadium is zinc, Pb, Co, V four kinds of heavy metal element correlation is poorer; In addition, based on thedistance coefficient of heavy metal elements in ginkgo biloba leaves were analyzed,and the results showed that the shahe bus station, to the north of chengdu university oftechnology and the gymnasium in ginkgo biloba As, Cr, Cu, V, four kinds of heavymetal elements of distance coefficient is higher than the control area (qingpingtownship of ginkgo biloba ditch), and the element of chengbei stadium with recentdistance coefficient is much higher than under the qingping township of ginkgo bilobaditch, shahe shop bus station distance coefficient of Pb element slightly higher thanthe qingping township of ginkgo biloba ditch. Comprehensive the above analysisshows that chengdu urban atmospheric pollution has been As element, in addition,chengdu urban atmosphere of heavy metal pollution situation in different regions havedifferences, in the three sampling points of the present study shahe bus station shopatmosphere may have been under Pb, Cr, Cu, three kinds of heavy metal pollution,chengdu university of technology atmosphere may have been two kinds of heavymetals pollution, Pb, V and chengbei stadium atmosphere may have been Pb, zinc, Co,V four kinds of heavy metal pollution.6）The results of correlation analysis of the other trace elements and thecorrelation between total rare earth, and other trace elements of biological availability,the results showed that the chengdu urban air pollution may have been Sb elements. |
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