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土壤圈(英文版). 2002, (02)

Profile Characteristics and Potential EnvironmentalEffect of Accumulated Phosphorusin Soils ofVegetable Fields in BeliingEnglish Full Text

SU DECHUN, YANG FENHE and ZHANG FUSUODepartment of Plant Nutrition, China Agricultural University, Beijing 100094 (China)

Abstract: 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 leachates from the columns of the vegetable field soils with highaccumulated P, which has a potential effect on the groundwater and natural water quality.
Keywords：

accumulated P，bioavailability,environment; vegetable fields;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S155.46

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