The Study On Soil's Heavy Metal Pollution And Landscape Trees Resistance Heavy Metal Pollution In City Of Baotou

With the recent rapid development of industrialization and urbanization, so that header social and economic progressed greatly, so city's ecological environment was destroyed, it made a lot of harm to people's normal production and life. At the same time modern agriculture in order to save manpower and increase production also use a lot of fertilizers herbicides pesticides and other chemical substances, Makes the types and quantities of the harmful substances increased into the environment, Lead to the levels of environmental pollution growing more and more. In this paper, by the study on the heavy metals pollution and plant resistance in the city of Baotou then got the research results are:(1) By the survey growth condition of Six conifer species,17 hardwood species,5 Shrubs, A total of 4369 trees' in the city of Baotou,, found that Pine, juniper, elm, mulberry, mountain peach, clove and other nine species show good growth, adaptable to various unfavorable factors; bungeana,pine,spruce,plus Young,lobular Yang,Hebei Yang,Sophora japonica,Robinia pseudoacacia,saponins Growth performance and adaptability on the middle level; juniper poor performance and weak adaptability; shrubs are growing well.(2) Test plots in 27 of 56 soil samples of the test results showed that different sections, different layers of soil heavy metals content in different places on the 27 tested samples taken from 56 soil samples, the average content of view The average content of the size of the state of the Mn> Zn> Cr> Cu> Co> Ni> Pb.(3) The soil of City of Baotou Mn, Cu, Pb, Ni and other elements were much higher than the background value of soil elements in China, especially Cu, Pb, Ni content of the highest of three elements in the sample to background values than the national high near 10 times.(4) Different types of deciduous broad-leaved tree species enrichment conditions very different heavy metals, heavy metals accumulation in different tree species in the number of different, such as Populus, simonii accumulation on the Mn strongest elements; Salix branches in the Zn enrichment of elements in the highest; elm branches of Cr, the highest enrichment, the enrichment in leaves of the highest Pb; acacia shoots in the highest Ni enrichment of the elements.(5) Surveyed six conifer species, Chinese pine, juniper, spruce, pine on the better tolerance of heavy metals, bungeana and juniper on poor tolerance. Pine is on the strongest enrichment, followed by spruce, pine and juniper second, bungeana and juniper worst enrichment capability.(6) Measured in the survey sample to 5 flowers bush, pearl plum and rose on the strong accumulation ability of heavy metals, including the enrichment of the strongest Sorbaria, rose the second, the enrichment capacity of Tamarix most difference.(7) Plants distribution of heavy metal elements Mn leaf> branch department; heavy metals Zn, Cu, Department of the distribution for the branch> leaf; Xinjiang Yang, lobular Yang,(8) From different sources from CCS, with varying degrees of soil contamination, enrichment plants are not the same, in general, the closer from the source of pollution, soil pollution more serious, strong resistance to the more accumulation ability of species high. Better Green building, more distant location from the pollution source, the lower the heavy metal pollution.