Chemical Criteria to Assess Risk of Phosphorus Leaching from Urban SoilsEnglish Full Text

ZHANG Gan-Lin, W. BURGHARDT and YANG Jin-LingState Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008 (China).Department of Applied Soil Science, University of Duisburg-Essen, Essen 45117 (Germany)

Abstract: Soils from urban and suburban areas are normally enriched with phosphorus （P）. Sixteen urban soils with a wide range of total P concentrations under typical urban land uses were sampled and analyzed for extractable P concentrations using water, sodium bicarbonate and citric acid. Meanwhile the soils were artificially leached in columns and P concentrations in the leachates were determined. With linear regression a two-stage linear relationship was found to exist between concentrations of P in the leachates and soil P contents obtained by various chemical measurements, i.e., there was a "change-point" denoting the critical threshold value for extractable P between the regression lines, above which concentrations of P in leachates increased substantially. These threshold "change-point" values were 1.5 mg kg-1 for water-soluble P and CaCl2-P, 25 mg kg-1 for Olsen-P, and 250-350 mg kg-1 for citric acid-P with the sharpest change and the best predictor [r2 （upper） = 0.928, r2 （lower） = 0.807] appearing for Olsen-P. These "change-points" were considered important criteria in assessing the risk of P leaching from urban soils and could be used as standards to delineate and target hazardous areas in urban and suburban areas.

Keywords：

assessment; leaching; phosphorus; urban soils;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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Chemical Criteria to Assess Risk of Phosphorus Leaching from Urban SoilsEnglish Full Text

ZHANG Gan-Lin, W. BURGHARDT and YANG Jin-LingState Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008 (China).Department of Applied Soil Science, University of Duisburg-Essen, Essen 45117 (Germany)

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