Acidification and alkalinization of soils

N. van Breemen, J. Mulder, C. T. Driscoll

Research output: Contribution to journalArticle

445 Scopus citations

Abstract

Acidification or alkalinization of soils occurs through H+ transfer processes involving vegetation, soil solution and soil minerals. A permanent change in the acid neutralizing capacity of the inorganic soil fraction (ANC(s)), i.e. soil acidification (ΔANC<0) or soil alkalinization (ΔANC>0), results from an irreversible H+ flux. This irreversible H+ flux can be caused either by direct proton addition or depletion, by different mobility of components of the ANC(s) or by a permanent change in redox conditions. The contributions of (a) acidic atmospheric deposition, (b) nitrogen transformations, (c) deprotonation of CO2 and of organic acids and protonation of their conjugate bases, (d) assimilation of cations and anions by the vegetation, (e) weathering or reverse weathering of minerals and (f) stream output to changes in the ANC(s) are illustrated by means of H+ budgets for actual soils and watersheds.

Original languageEnglish (US)
Pages (from-to)283-308
Number of pages26
JournalPlant and Soil
Volume75
Issue number3
DOIs
StatePublished - Oct 1 1983
Externally publishedYes

Keywords

  • Acid neutralizing capacity
  • Assimilation of cations and anions
  • H-budget
  • Mineral weathering
  • Mineralization of organic matter
  • N-cycle
  • Oxidation reduction cycles
  • Soil acidification
  • Soil acidity
  • Soil alkalinization
  • Soil pH

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

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