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Abstract Johnson,
S., N.V. Nkongolo, R. Paro and F. Eivazi. 2007. Spatial variability of soil
thermal properties and CO2, CH4 and N2O emissions
from a pasture in central Knowledge of the spatial distribution of CO2, N2O, and CH4 is important in establishing practical methods of reducing greenhouse gases emissions. The objective of this study was to map the distribution of CO2, CH4 and N2O fluxes from soil in a pasture. The study was conducted from June to August 2006 at Lincoln University’s Carver farm. Twenty static chambers were installed in a 1.42 ha plot. The locations of chambers were recorded using Geo-Explorer pathfinder 3-Global Positioning System. The gas sampling process consisted in closing the chamber’s top and the two ventilation holes with rubber stoppers and collecting soil air samples at thirty minute intervals. Analysis of CO2, CH4 and N2O from soil air samples was done within two hours of sampling, with a Shimadzu Greenhouse Gas GC-14. Maps of CO2, N2O, and CH4 fluxes were produced with ARCGIS 9.2 Spatial Analyst Extension. Inverse distance weighing (IDW) was used as the interpolation method. In June, CO2 emissions were low in the north and high in the southwest. This trend continued throughout the month of August. In June, N2O distribution showed shifts from high emissions in the north, at the beginning of the month, to low emissions in the north at the end of the month. In August, N2O emissions were low in the north and high in the central region. CH4 emissions stayed relatively the same within these two months. These preliminary results stress the need to monitor the fluctuations of gas fluxes in space and time if sound mitigation strategies are to be devised. |
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