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| Efficiency of nutrition and heavy metal variable features in coal ash stacking yard during vegetation restoration |
| Wang Xiaofeng1,2,Cai Tijiu1,Gong Wenfeng2,Ren Xiaoxu1,Liu Wenyong1 |
| 1.School of Forestry,Northeast Forestry University,150040;2.School of Hydraulic and Electric Engineering,Heilongjiang University,150086: Harbin,China |
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Abstract This paper is conducted in the nutrient and heavy metal characteristics of coal ash substrates during natural vegetation restoration and artificial vegetation restoration in coal ash pile of Di-dao gangue fired power plant in JIXI Heilongjiang province,and the effect of different vegetation restoration on nutrient and heavy metal status of coal ash substrates is analyzed.Results are as below: 1) the nutrient content of coal ash substrates is extremely disproportion,organic matter,total N and available P are extreme deficiency,available N and available K are rich.2) During the processes of pilling up,the nutrients in the coal ash is leaching.The loss degree of total nutrition is higher than that of available nutrition.3) The artificial vegetation restoration processes could significantly improve the nutrient status of surface coal ash substrates.the organic matter content increases by 459.28%,total N content increases by 238.46%,total P content increases by 131.4%,contents of available N、P and K increase by 30.17%,56.29% and 22.58% respectively.4)Hg is the main heavy metal exceeding standard in the coal ash stacking yard and carrying soil restoration pattern decreases efficiently the amount of heavy metal in the coal ash substrates.Compared with the heavy metal in the sample fields with natural vegetation restoration,the amount of Hg,Cu,and Cr has decreases by 66.93%,68.82% and 16.09% separately.
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Received: 19 July 2008
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