Experimentally induced root mortallity increased nitrous oxide emisions from tropical forest soils

TitleExperimentally induced root mortallity increased nitrous oxide emisions from tropical forest soils
Publication TypeJournal Article
Year of Publication2003
AuthorsVarner, RK, Keller, M, Robertson, JR, Dias, JD, Silva, H, Crill, P, McGroddy, ME, Silver, WL
JournalGeophysical Research Letters
Volume30
Issue3
Pagination1141-1145
Accession NumberLUQ.668
Keywordsglobal change
Abstract

We conducted an experiment on sand and clay tropical forest soils to test the short-term effectof root mortality on the soil-atmosphere flux of nitrous oxide, nitric oxide, methane, and carbon dioxide. We induced root mortality by isolating blocks of land to 1 m using trenching and root exclusion screening. Gas fluxes were measured weekly for ten weeks following the trenching treatment. For nitrous oxide there was a highly significant increase in soil-atmosphere flux over the ten weeks following treatment for trenched plots compared to control plots. N2O flux averaged 37.5 and 18.5 ng N cm-2h-1from clay trenched and control plots and 4.7 and 1.5 ng N cm-2h-1 from sand trenched and control plots. In contrast, there was no effect for soil-atmosphere flux of nitric oxide, carbon dioxide, or methane.

URLhttp://amazonpire.org/PDF/fc2009/readings/Varner%20et%20al%202003.pdf
DOI10.1029/2002GL016164
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