|Title||Experimentally induced root mortallity increased nitrous oxide emisions from tropical forest soils|
|Publication Type||Journal Article|
|Year of Publication||2003|
|Authors||Varner, RK, Keller, M, Robertson, JR, Dias, JD, Silva, H, Crill, P, McGroddy, ME, Silver, WL|
|Journal||Geophysical Research Letters|
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.