Premium
Experimentally induced root mortality increased nitrous oxide emission from tropical forest soils
Author(s) -
Varner Ruth K.,
Keller Michael,
Robertson Jillana R.,
Dias Jadson D.,
Silva Hudson,
Crill Patrick M.,
McGroddy Megan,
Silver Whendee L.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl016164
Subject(s) - nitrous oxide , methane , carbon dioxide , atmosphere (unit) , soil water , environmental science , flux (metallurgy) , carbon dioxide in earth's atmosphere , environmental chemistry , soil science , chemistry , physics , organic chemistry , thermodynamics
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. N 2 O 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.