Element interactions limit soil carbon storage

K.J. van Groenigen, J. Six, B.A. Hungate, M.A. de Graaff, N. van Breemen, C. van Kessel

Research output: Contribution to journalArticleAcademicpeer-review

254 Citations (Scopus)

Abstract

Rising levels of atmospheric CO2 are thought to increase C sinks in terrestrial ecosystems. The potential of these sinks to mitigate CO2 emissions, however, may be constrained by nutrients. By using metaanalysis, we found that elevated CO2 only causes accumulation of soil C when N is added at rates well above typical atmospheric N inputs. Similarly, elevated CO2 only enhances N-2 fixation, the major natural process providing soil N input, when other nutrients (e.g., phosphorus, molybdenum, and potassium) are added. Hence, soil C sequestration under elevated CO2 is constrained both directly by IN availability and indirectly by nutrients needed to support N2 fixation.
Original languageEnglish
Pages (from-to)6571-6574
JournalProceedings of the National Academy of Sciences of the United States of America
Volume103
Issue number17
DOIs
Publication statusPublished - 2006

Keywords

  • elevated atmospheric co2
  • biological nitrogen-fixation
  • ecosystem responses
  • climate-change
  • fine roots
  • grassland
  • forest
  • model
  • cycles
  • metaanalysis

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