Pedosphere 12(2): 179--184, 2002
ISSN 1002-0160/CN 32-1315/P
©2002 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Profile characteristics and potential environmental effect of accumulated phosphorus in soils of vegetable fields in Beijing
SU De-Chun, YANG Fen-He and ZHANG Fu-Suo
Department of Plant Nutrition, China Agricultural University, Beijing 100094 (China)
ABSTRACT
      Profile characteristics of accumulated P in 10 representative soils of vegetable fields in suburban districts of Beijing were investigated. Bioavailability of the accumuIated P and its potential effect on the environment were studied in a greenhouse pot experiment and a soil column experiment. The results showed that theconcentration of Olsen-P in the 0-20 cm soil samples of the vegetable fields ranged from 22.1 to 358.0 mg kg-1, which was 2 to 10 times higher than that of the crop fields in the suburbs of Beijing. Most of theexcessive phosphorus was accumulated in the topsoils. The longer the soils cultivated with vegetables, thehigher the soil total P, Olsen-P and organic matter concentration. Accumulated P in the soils from vegetablefields had higher bioavailability. Application of phosphorus fertilizer could not increase the dry weights ofcucumbers, Chinese cabbage, and rape seedlings continuously planted. The soil column study showed high P concentration (> 0.6 mg L-1) in the leachates from the columns of the vegetable field soils with high accumulated P, which has a potential effect on the groundwater and natural water quality.
Key Words:  accumulated P, bioavailability, environment, vegetable fields
Citation: Su, D. C., Yang, F. H. and Zhang, F. S. 2002. Profile characteristics and potential environmental effect of accumulated phosphorus in soils of vegetable fields in Beijing. Pedosphere. 12(2): 179-184.
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