Tuesday, November 14, 2006

CO2, CH4, and N2O Emission from Soil of a Secondary Forest in Central Missouri.

Robert Paro, Nsalambi Nkongolo, Shane Johnson, and Kent Schmidt. Lincoln Univ, Gis Lab, 307 Founders Hall, Jefferson City, MO 65102-0029

Soil thermal properties control the conduction of heat into the soil profile and can affect the production and release of greenhouse gases into the atmosphere. This study was conducted to investigate whether there is a relationship between the fluxes of CO2, CH4 and N2O and soil temperature (T), thermal conductivity (K), resistively (R) and diffusivity (D) in a secondary forest of Central Missouri. The study was conducted at Lincoln University’s Busby Farm Experimental Station. Closed chambers with two ventilation holes located on the sides were used. The chambers sides and top were sealed for 30 minutes and an air sample was collected with a 50 ml syringe and stored in 200ml Tedlar bag. Samples were analyzed within two hours after collection at the Dickinson Research Center with a Shimadzu Greenhouse Gas GC-14A. The KD2 thermal properties meter (Decagon) was used to measure soil thermal properties. The following results were obtained for this study. CO2 fluxes ranged from 11.86 to 172.90 mg C-CO2 m-2 h-1, N2O ranged from -5.72 to 18.80 ug N-N2O m-2 h-1 with CH4 ranging from -203.48 to 91.94 ug C-CH4 m-2 h-1. CO2 was linearly correlated with (K), (R), (T) and (D) whereas N2O only linearly correlated with (R). CH4 was only correlated with (T). Correlation coefficients ranged from 0.40 to 0.60. These results suggest that soil thermal properties may have an impact on the production and release of CO2 into the atmosphere from forest soils.          

Handout (.pdf format, 165.0 kb)