A Research On Technology Of Plant Ecological Restoration

With the development of urbanism, industrialization and agricultural;centralization, theproblem of the pollution of heavy metal and organism are becoming more and more serious.Thanks to the features of invisibility, chronicity and irreversibility in soil and water, thetraditional physical and chemical methods may result in both the destruction of soil structureand deterioration of chemical fertilizer and the costly administration and expensiveinvestment, meanwhile it is difficult to deal with the pollution in large scale. Technology ofplant ecological restoration, however, can recover the disadvantage of traditional managementand it is beneficial for environment. It costs less but can be operated easily with lessdisturbance to the environment ,and at the same time it absorbs the pollutants of heavy metalfrom soil and can eliminate those harmful substances from atmosphere nearby and water. Itcan be accepted by the society due to the high value of beautifying environment. Thereforethe fundamental theory of technology of plant ecological restoration has been a hot topic ininternational academic research in this field.Technology of plant ecological restoration based on the theory that plant system can bearand accumulate excess a kind of pollutant or some pollutants is a pollution abatementtechnology by eliminating pollutant by means of system of plants and its micro-organism. Thepaper analyzes the mechanism of technology of plant ecological restoration and focuses onpollution of heavy metal. It also discusses Ph value of the soil, oxidation-reduction potentialEh, concurrent organ and the compound effects among the pollutants, nutritious substances,organ and the compound effects and biological factors and so on. The key to this technique isto find out super concentration plant which has functions of special absorbing ability or itsgenes. The paper sort out and classifies the plants with these characteristics ,its features,physiological mechanism etc ,and makes detailed introduction about them.In the research of technology of plant ecological restoration, the experimental plants areChina rose, gardenia and chrysanthemum which belong to common view flowers in ourcountry. They have been planted into flower pots for five months to examine the potential andfeasibility of soil restoration of Cd polluted soil, and then put them into Cd soil of5,10,20,40,50 mg/kg respectively, the result of which are the average Cd accumulation ofChina rose, gardenia and chrysanthemum are 88.191 mg.kg-1 ,10.236 mg.kg-1,2.958mg.kg-1, and the rate of Cd disposing reached 20.52%,3.07%,1.00%.The experiment showstheir obvious difference in disposing Cd pollutant. Compared with the other plants ,China roseis most appropriate plants to accumulate pollutant and it has high resistance ability. Gardenia,whose accumulation ability is 9 times lower than China rose but 4 times higher thanchrysanthemum, can be used as an auxiliary restoration plant. Chrysanthemum'saccumulation ability and resistance are not enough and therefore it can't be used as soilrestoration plant. In addition, in the research of technology of plant ecological restoration, the paper putforward the restoration solution to the polluted plants, providing the technical platform forapplication of plant ecological restoration regarding to present situation and feature of soil,mine field ore storage, atosmosphere, water and organic pollutant, radioactive pollutant, gaspollutant and nutritious pollutant.This paper elaborates the analysis and application on the research of this technique andpoints out the advantages, disadvantages of different techniques , focus and developmenttrend.The findings indicate that this technology is one of the most efficient and practical methods in this fieldwhich will play a significant role in Chinese pollution management even in the worldwide scope. Thereforethe technology of plant ecological restoration has a bright prospect of application and diffusion.