Phosphorus biogeochemistry across a precipitation gradient in grasslands of central North America

J. A. Ippolito, S. W. Blecker, C. L. Freeman, R. L. McCulley, J. M. Blair, E. F. Kelly

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Soil P transformations and distribution studies under water limited conditions that characterize many grasslands may provide further insight into the importance of abiotic and biotic P controls within grass-dominated ecosystems. We assessed transformations between P pools across four sites spanning the shortgrass steppe, mixed grass prairie, and tallgrass prairie along a 400-mm precipitation gradient across the central Great Plains. Pedon total elemental and constituent mass balance analyses reflected a pattern of increased chemical weathering from the more arid shortgrass steppe to the more mesic tallgrass prairie. Soil surface A horizon P accumulation was likely related to increased biocycling and biological mining. Soluble P, a small fraction of total P in surface A horizons, was greatest at the mixed grass sites. The distribution of secondary soil P fractions across the gradient suggested decreasing Ca-bound P and increasing amounts of occluded P with increasing precipitation. Surface A horizons contained evidence of Ca-bound P in the absence of CaCO3, while in subsurface horizons the Ca-bound P was associated with increasing CaCO3 content. Calcium-bound P, which dominates in water-limited systems, forms under different sets of soil chemical conditions in different climatic regimes, demonstrating the importance of carbonate regulation of P in semi-arid ecosystems.

Original languageEnglish
Pages (from-to)954-961
Number of pages8
JournalJournal of Arid Environments
Issue number8
StatePublished - Aug 2010


  • Grassland ecosystems
  • Phosphorus biogeochemistry
  • Sequential phosphorus extraction
  • Soil weathering

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Earth-Surface Processes


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