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GEOPHYSICAL RESEARCH LETTERS,
VOL. 30, NO. 3,
1144,
doi:10.1029/2002GL016164,
2003
Experimentally induced root mortality increased nitrous oxide emission from tropical forest soils
Ruth K. Varner
Complex Systems Research Center, Institute for the Study of Earth Oceans and Space,
University of New Hampshire,
Durham,
New Hampshire,
USA
Michael Keller
Complex Systems Research Center, Institute for the Study of Earth Oceans and Space,
University of New Hampshire,
Durham,
New Hampshire,
USA USDA Forest Service,
International Institute of Tropical Forestry,
Rio Piedras,
Puerto Rico
Jillana R. Robertson
Complex Systems Research Center, Institute for the Study of Earth Oceans and Space,
University of New Hampshire,
Durham,
New Hampshire,
USA
Jadson D. Dias
Fundacao Floresta Tropical,
Santarem,
Para,
Brazil
Hudson Silva
Complex Systems Research Center, Institute for the Study of Earth Oceans and Space,
University of New Hampshire,
Durham,
New Hampshire,
USA
Fundacao Floresta Tropical,
Santarem,
Para,
Brazil
Patrick M. Crill
Complex Systems Research Center, Institute for the Study of Earth Oceans and Space,
University of New Hampshire,
Durham,
New Hampshire,
USA
Megan McGroddy
Department of Ecology and Evolutionary Biology,
Princeton University,
Princeton,
New Jersey,
USA
Whendee L. Silver
Division of Ecosystem Sciences, Department of Environmental Science, Policy, and Management,
University of California,
Berkeley,
California,
USA
Abstract
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.
Published 14
February
2003.
Index Terms: 0315 Atmospheric Composition and Structure: Biosphere/atmosphere interactions; 1615 Global Change: Biogeochemical processes (4805); 1610 Global Change: Atmosphere (0315, 0325); 0394 Atmospheric Composition and Structure: Instruments and techniques.
Read Full Article (file size: 129490 bytes) Cited by
Citation: Varner, R. K., M. Keller, J. R. Robertson, J. D. Dias, H. Silva, P. M. Crill, M. McGroddy, and W. L. Silver
(2003),
Experimentally induced root mortality increased nitrous oxide emission from tropical forest soils,
Geophys. Res. Lett.,
30(3),
1144,
doi:10.1029/2002GL016164.
Copyright 2003 by the American Geophysical Union.
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