Water, Air, and Soil Pollution

, Volume 83, Issue 1, pp 69–84

Distribution of phosphorus in soil aggregate fractions and its significance with regard to phosphorus transport in agricultural runoff

  • Z. L. He
  • M. J. Wilson
  • C. O. Campbell
  • A. C. Edwards
  • S. J. Chapman
Article

DOI: 10.1007/BF00482594

Cite this article as:
He, Z.L., Wilson, M.J., Campbell, C.O. et al. Water Air Soil Pollut (1995) 83: 69. doi:10.1007/BF00482594

Abstract

Surface runoff is the major way of P transport from agricultural land to surface waters. To assess the potential of P loss in runoff in relation to soil P status, the chemical nature and distribution of soil P in different size classes of water-stable aggregates were quantified for two distinctive soil types. For both soils unfertilized areas under pasture and well-fertilized arable soils were sampled. The content of total P, organic P and microbial biomass P (Pmic) decreased in the aggregate size order <0.1, 1–2, and 0.1–1.0 mm respectively. In contrast available P (extracted by Bray I reagent) was lowest in the <0.1 mm aggregate size. Cultivation decreased the percentage of 1–2 mm aggregates but increased that of the <0.1 mm aggregates. Fertilization increased markedly both total P and organic P in the <0.1 mm fraction of arable soils compared to the corresponding samples from unfertilized grassland soils. During aggregate separation, most of P loss was in the form of particulate P and less than 1% in solution. More organic P and Pmic were lost from the grassland soils than from the arable soils.

Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Z. L. He
    • 1
  • M. J. Wilson
    • 1
  • C. O. Campbell
    • 1
  • A. C. Edwards
    • 2
  • S. J. Chapman
    • 1
  1. 1.Division of Soils and MicrobiologyThe Macaulay Land Use Research Institute CraigiebucklerAberdeenUK
  2. 2.Plants DivisionThe Macaulay Land Use Research Institute CraigiebucklerAberdeenUK
  3. 3.Department of Soil Science and AgrochemistryZhejiang Agricultural UniversityHangzhouChina

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