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See more from this Division: SSSA Division: Soil Physics
See more from this Session: Symposium--Soil Science Challenges in Land Surface and Global Climate Modeling: I
Monday, November 4, 2013: 4:45 PM
Tampa Convention Center, Room 16
Abstract:
In general, studies on spatial variability of gas emissions by applying geostatistical techniques are scarce. Considering the importance of knowledge of emissions of greenhouse gases and understanding the factors that influence the flow of gases in the soil, this study aimed to characterize and model the spatial and temporal variability of N2O emissions. To conduct the experiment was chosen an area with pasture (Brachiaria brizanta) belonging to Embrapa Agrobiology, located at the municipality of Seropédica-RJ, Brazil. One regular grid with 60 georeferenced points (spacing of 7.5 x 5.5 meters) was settled. In each point, cameras were installed to measure the emission of N2O. At intervals of 2 days to 1 week, the N2O emission was monitored in the period from May 2012 to August 2012 (dry season). The results demonstrate that the spatial variability of N2O emissions showed different patterns depending on the period evaluated (random and spatial dependence). For the days when spatial dependence were found, spherical model was fitted, which had very similar parameters at intervals of 42 days. The results suggest that the emission of N2O shows cyclic behavior when under the same management condition and in the dry season.
See more from this Division: SSSA Division: Soil Physics
See more from this Session: Symposium--Soil Science Challenges in Land Surface and Global Climate Modeling: I