| 1 | Profile Characteristics and Potential EnvironmentalEffect of Accumulated Phosphorus in Soils of Vegetable Fields in Beijing显示文摘Profile characteristics of accumulated P in 10 representative soils of vegetable fields in suburban districtsof Beijing were investigated. Bioavailability of the accumuIated P and its potential effect on the environmentwere 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 mgkg-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 highP concentration (> 0.6 mg L-1) in the | SU DECHUN, YANG FENHE and ZHANG FUSUODepartment of Plant Nutrition, China Agricultural University, Beijing 100094 (China) | 2002 | Pedosphere2002，12，2： | 20 |
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