Monday, November 13, 2006
47-7

Monitoring CO2, CH4, and N2O Emissions from Soil in Agricultural Fields in Central Missouri.

Nsalambi Nkongolo and Kent Schmidt. Lincoln Univ, Founders Hall, Jefferson City, MO 65102-0029

Land use type influences the sources and sinks for greenhouse gases emissions. To better quantify the effect of land use type on gases fluxes, we are monitoring CO2, CH4 and N2O emissions from soils in a Grassland, Forest and Agricultural Fields (Corn and Soybean) in Central Missouri. The relationship between soil temperature (T), thermal conductivity (K), resistivity (R) and diffisivity (D) and gases fluxes is also being investigated. Results obtained to date show that soils from these land act as sources for CO2 and N2O and sinks for CH4 with the following patterns -CO2 emissions: Grassland > Cornfield > Soybean > Forest; -N2O emissions: Forest > Corn > Grassland > Soybean and – CH4 uptake: Forest > Corn > Grass > Soybean.  Linear correlations between soil K, R and D with gases fluxes are also persistent in all of these land use types, particularly in the forest and cornfield. This study will certainly provide useful information on soil controlling factors needed in predictive models for greenhouse gases fluxes.
 

Handout (.pdf format, 267.0 kb)

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