Fate and distribution of nitrogen in soil and plants irrigated with landfill leachate
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香港中文大學研究人員

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摘要Landfill leachate contains a high concentration of ammoniacal substances which can be a potential supply of N for plants. A bioassay was conducted using seeds of Brassica chinensis and Lolium perenne to evaluate the phytotoxicity of the leachate sample. A soil column experiment was then carried out in a greenhouse to study the effect of leachate on plant growth. Two grasses (Paspalum notatum and Vetiver zizanioides) and two trees (Hibiscus tiliaceus and Litsea glutinosa) were irrigated with leachate at the EC50 levels for 12 weeks. Their growth performance and the distribution of N were examined and compared with columns applied with chemical fertilizer. With the exception of P. notatum, plants receiving leachate and fertilizer grew better than those receiving water alone. The growth of L. glutinosa and V. zizanioides with leachate irrigation did not differ significantly from plants treated with fertilizer. Leachate irrigation significantly increased the levels of NH(x)-N in soil. Although NO(x)-N was below 1 mg N L(-1) in the leachate sample, the soil NO(x)-N content increased by 9-fold after leachate irrigation, possibly as a result of nitrification. Leachate irrigation at EC50 provided an N input of 1920 kg N ha(-1) over the experimental period, during which up to 1050 kg N ha(-1) was retained in the soil and biomass, depending on the type of vegetation. The amount of nutrient added seems to exceed beyond the assimilative capability. Practitioners should be aware of the possible consequence of N saturation when deciding the application rate if leachate irrigation is aimed for water reuse. (C) 2011 Elsevier Ltd. All rights reserved.
著者Cheng CY, Chu LM
期刊名稱Waste Management
出版年份2011
月份6
日期1
卷號31
期次6
出版社Elsevier
頁次1239 - 1249
國際標準期刊號0956-053X
語言英式英語
Web of Science 學科類別Engineering; Engineering, Environmental; ENGINEERING, ENVIRONMENTAL; Environmental Sciences; ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology

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