Research On The Influence Of The Characteristics Of Heavy Metal Contamination In Soil Along Great Huanjiang River On Local Plants And Plant Diversity

Environment pollution has been the hotspots which the whole society cares about. And humans'development and utilization of resourses and environment can cause heavy contamination pollution, which has been a world difficulty. So the management and ecological restoration of polluted area has been an urgent task which our country should face. Vegetation change and plant diversity survey in polluted area is commonly method of investigation, through field survey ,we can find out the status of distribution of vegetation, the degree of plant diversity in polluted area , in turn, we can grasp the distribution of tolerant plants and repair plants of polluted area , which provide realistic plant resources for soil remediation in polluted area, the local dominant plant species and tolerant species expanded introduction, which can both achieve remediation of heavy metal contaminated soil, but also save a lot of financial and material resourcesAfter the investigation of plant and plant diversity in 4 points of polluted area of Great Huanjiang coastal region, and gather a lot of plant specimen. Based on this and the mensuration of soil heavy metal, and analysis of plant flora composition; seek the impact degree of heavy metal onplant flora composition. Compared the investigated plants'frenquency in quads and community dissimilarity between quadrat cluster. Then analyze relations between Pb,Zn and As acontent and plant frequency. Then we can get some plants which can have tolerance of Zn,Pb and As.And through the research of 20 dominant species distribution partterns in Great Huanjiang polluted area,we can analyze the reason , and then give some suggestions on the screening of accumulator plants for local area.1.There are 45 vascular plants in 4 places of Great Huanjiang coastal area.,which belongs to 21 families ,42 generas . Fern has 2 families,3 generas, 3 species. Gymnosperm has 3 families, 4 generas, 5 species; angiosperm has16 families, 35 generas, 37 species. Because the damage of heavy metal contamination on plants is very serious. So the richness of plants in Huanjiang polluted area is very low, which has influence on the structure of local flora.The dominate families are Euphorbiaceaec,Poaceae,Leguminosae,Asteraceae etc.; the dominate genera are Eragrostis,Pueraria DC.,Artemisia,Pteridum etc. Compare with Mulun Nature Reserve and Xunle Miao people township, plant species are only 8.65% of Mulun Nature Reserve, 18.75% of Xunle Miao people township. Vegetation dominant families along Great Huanjiang river are Euphorbiaceaec,Poaceae,Leguminosae,Asteraceae etc, Vegetation dominant kinds are Eragrostis,Pueraria DC. Artemisia,Pteridum etc。2.The frequency of different plants is different in different Pb,Zn and As content samples. The high frequency plants in high Pb samples are Eragrostis pilosa (L.) Beauv.,Glochidion puberum (Linn.)Hutch,Imperata cylindrica (Linn.) Beauv,Setaria viridis (L.) Beauv,Cynodondactylon(Linn.)Pers,Leucaena leucocephala (Lam.) de Wit,Pueraria lobata (Willdenow) Ohwi,Dicranopteris linearis,Eleusine etc,they may have endurance on Pb., the high frequency plants in high Zn samples are Eragrostis pilosa (L.) Beauv,Setaria viridis (L.) Beauv,Imperata cylindrica (Linn.) Beauv,Miscanthus sinensis Anderss.,Cynodondactylon(Linn.)Pers,Dicranopteris linearis,Lysimachia fortunei Maxim,Arthraxon Beauv. etc,they may have endurance on Zn. the high frequency plants in high As samples are Eragrostis pilosa (L.) Beauv.,Setaria viridis (L.) Beauv,Cynodondactylon(Linn.)Pers,Dicranopteris linearis,Miscanthus sinensis Anderss.,Pueraria lobata (Willdenow) Ohwi,Lysimachia fortunei Maxim,Ageratum conyzoides L etc. they may have endurance on As.Some plants have endurance on all Pb,Zn and As,such as Eragrostis pilosa (L.) Beauv.,Setaria viridis (L.) Beauv,Cynodondactylon(Linn.)Pers,Imperata cylindrica (Linn.) Beauv,Dicranopteris linearis etc,they can be chosen preferentially. 3.The results indicated that the species in the community were all clumped. However,they were different in clump intensity .The patterns were closely related to not only biological characteristics of each species, but also the ecological characteristics of them. It was better for the plant populations with medium clump intensity to adapt to the heavy metals polluted environment than the others. In the end, the author tabled a proposal that the plant populations with medium clump intensity were the top-priority in choosing the pioneer plants or accumulator for controlling the heavy metals pollution with phytoremediation.