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Title: Short-term nitrous oxide profile dynamics and emissions response to water, nitrogen and carbon additions in two tropical soils
Authors: Nobre, Antônio Donato
Keller, Michael
Crill, Patrick Michael
Harriss, Robert C.
Keywords: Concentration (parameters)
Costa Rica
Gas Production
Nitrous Oxide Emission
Soil And Soil Related Phenomena
Soil Texture
Soil Water Content
Volcanic Soil
Nitrous Oxide
Soil Emission
Tropical Soils
Volcanic Soil
Costa Rica
Issue Date: 2001
metadata.dc.publisher.journal: Biology and Fertility of Soils
metadata.dc.relation.ispartof: Volume 34, Número 5, Pags. 363-373
Abstract: Tropical soils are potentially the highest and least studied nitrous oxide (N2O) production areas in the world. The effect of water, nitrate and glucose additions on profile concentrations and episodic emissions of N2O for two volcanic soils in Costa Rica was examined. Magnitudes of episodic N2O pulses, as well as overall N2O emissions, varied considerably and consistently, depending on soil texture, soil water content, and kind and availability of substrates. Emission pulses began within 30 min, peaking no later than 8 h after wetting. Production in the soil occurred mainly in the layer between 5 and 20 cm deep, but depended directly on the temporal dynamics of the water profile. Changes in soil NO3- were associated with soil N2O concentration changes. Depending on the treatments, one episodic N2O production event driven by one moderate rain could account for less than 15% to more than 90% of the total weekly production. Previous survey studies may have underestimated the contribution of N2O emissions from tropical soils. In order to improve budgets and models of N2O emissions, episodic emissions driven by rain events and amendments must be considered.
metadata.dc.identifier.doi: 10.1007/s003740100396
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