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Abstract
Paro, R.M,
N. V. Nkongolo, S. J. Adisa, N. O. Hoilett and F. Eivazi. 2008. Soil thermal properties as potential
controlling factors for CO2, N2O and CH4 emissions from a secondary forest in central
Missouri. JEMREST 5:211-220.
Landscapes, soil profiles
and greenhouse gases emissions vary greatly and so do the factors that
control them. The objectives of this study were to monitor CO2, CH4 and N2O fluxes and investigate the
potential relationships between soil thermal conductivity (K), resistivity
(R), diffusivity (D), temperature (T), specific heat (C), CO2, CH4 and N2O fluxes in a secondary forest of
central Missouri. The study was conducted in a forest
dominated by Oak and Hickory
trees on a Gatewood-Moko Silty Loam (Oxyaquic Hapludalfs) soil. Soil air samples for determination of CO2, CH4, and N2O fluxes were collected from twenty
static chambers installed on a 0.49 ha plot. Samples were analyzed within two
hours of collection using a Shimadzu GC-14. Soil thermal properties were
measured using a KD2 Pro-theta probe. Results showed that in 2006 CO2 fluxes ranged from 10.410 to 172.90 mg
C-CO2 m-2 h-1, N2O from
-54.45 to 40.39 ug N-N2O m-2 h-1 and CH4 from -203.48 to 91.94 mg C-CH4 m-2 h-1. CO2 linearly correlated with (K), (R), (T) and
(D) whereas N2O
only correlated with (R). CH4 only correlated with (T). During 2007, CO2 was 2.218 to195.88 mg C-CO2 m-2 h-1, N2O was
-13.79 to 45.48 ug N-N2O m-2 h-1 and CH4
was -143.32 to 122.81 mg C-CH4 m-2 h-1. CO2 for 2007 correlated with (T) and N2O
correlated with (C), CH4 correlated with (T) as
found in the 2006 study. Identification
of these potential controlling factors will aid in designing future control
strategies for greenhouse gases fluxes.
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