Deforestation causes increased dissolved silicate losses in the Hubbard Brook Experimental Forest

Daniel J. Conley, Gene E. Likens, Donald C. Buso, Loredana Saccone, Scott W. Bailey, Chris E. Johnson

Research output: Contribution to journalArticle

91 Scopus citations

Abstract

Globally significant increases in the riverine delivery of nutrients and suspended particulate matter have occurred with deforestation. We report here significant increases in streamwater transport of dissolved silicate (DSi) following experimental forest harvesting at the Hubbard Brook Experimental Forest, NH, USA. The magnitude of the streamwater response varied with the type of disturbance with the highest DSi export fluxes occurring in the manipulations that left the most plant materials on the soil surface and disturbed the soil surface least. No measurable loss of amorphous silica (ASi) was detected from the soil profile; however, ASi was redistributed within the soil profile after forest disturbance. Mass-balance calculations demonstrate that some fraction of the DSi exported must come from dissolution of ASi and export as DSi. Land clearance and the development of agriculture may result in an enhanced flux of DSi coupled with enhanced erosion losses of ASi contained in phytoliths.

Original languageEnglish (US)
Pages (from-to)2548-2554
Number of pages7
JournalGlobal Change Biology
Volume14
Issue number11
DOIs
StatePublished - Oct 29 2008

Keywords

  • Amorphous silica
  • Biogeo chemistry
  • Deforestation
  • Hubbard Brook
  • Mass balance
  • Stream water export

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Ecology
  • Environmental Science(all)

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