Study On Distribution Influence Factors Of Nutrient Elements And Heavy Metals Based On Reclaimed Land Filling With Fly Ash

With the development of the coal industry, worsening ecological environment of mining, mining area ecology reclamation were put on the agenda, and had come into its own. Ash field reclamation is an effective way to solve the environmental problems caused by coal ash. But the soil filled with fly ash after all is not strictly soil, the ability of matintain and supply fertility and crop yield and quality were difference with agricultural soil, even in the same reclamation land. In order to guide the production of farmers and the reclamation of fly ash, reclaimed basic research has the extremely vital signigicance.In this dissertation, the Old Luohe ash field, one part of Shangyao ash field in Huainan, Anhui Province, is the study area. Through combined field experiment, field sampling, laboratory analysis and indoor test, research the distribution regularity and its influence factors of the nutrient and heavy metal in reclaimed land with fly ash.The results show:①Except pH and water content, each nutrient and heavy metal is uneven distribution in horizontal direction.②In vertical direction, with the increase of depth, the distribution of each nutrient has many semantic differences, pH and water content are increasing trend, the content of organic metter is reduce fist and then increased but not too much, the contents of hydrolysis nitrogen and rapidly-available potassium distribute as after first reduce increased, the content of Rapidly-available phosphorus distribute as after first reduce increased and then increased; the distributions of heavy metals show higher consistency, the contents of heavy metals are large difference between in surface soil and in fly ash, except Zinc, the contents of other heavy metals in surface soil are all lower than in fly ash, but the amplitude variation is little in the same medium, and the heavy metals in fly ash are moving surface soil.③The chemical composition\strcuture characteristics\particle size etc influence the distribution of nutrient and heavy metal, because of containing active part, such as SiO2,Al2O3, having porous structure, and containing active groups in paricle surface, fly ash is used as the carrier to absorb and bear the nutrient and heavy metal, having certain adsorption fixed ability, and the fixed ability of fine ash is stronger than coarse ash, the released ability of coarse ash is stronger than fine ash; the pH and water content of soil have certain influence on the distribution of nutrient and heavy metal; in addition, heavy metal polluted is also influence on the distribution of nutrient and heavy metal.Figure [23] Table [21] Reference [91]...