Experimentally induced root mortality increased nitrous oxide emission from tropical forest soils

Details Experimentally induced root mortality increased nitrous oxide emission from tropical forest soils Experimentally induced root mortality increased nitrous oxide emission from tropical forest soils

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30c..44v&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 3, pp. 44-1, CiteID 1144, DOI 10.1029/2002GL016164

Physics

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Global Change: Biogeochemical Processes (4805), Global Change: Atmosphere (0315, 0325), Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

We conducted an experiment on sand and clay tropical forest soils to test the short-term effect of 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-2 h-1 from clay trenched and control plots and 4.7 and 1.5 ng N cm-2 h-1 from sand trenched and control plots. In contrast, there was no effect for soil-atmosphere flux of nitric oxide, carbon dioxide, or methane.

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