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Abstract
Robert, P., N.
Nkongolo, S. Johnson and F. Eivazi. 2007. Spatial variability of CO2, CH4 and N2O fluxes from soil of a secondary
forest in Central Missouri. JEMREST
3:42-52
DOI: 10.4029/2007jemrest3no123
Greenhouse
gas fluxes vary considerably across the landscape, thus mapping their
distributions is helpful in designing gas emission reduction strategies. The
objective of this study was to assess the spatial distribution of greenhouse
fluxes from soil of secondary forest in Central Missouri.
The study was conducted at Lincoln University Busby forest. Twenty static
chambers were installed on a 0.49 ha plot. Chamber locations were recorded
with a Geo-Explorer pathfinder 3 GPS. Chambers were sealed for 30 minutes and
soil air samples were collected. Samples were analyzed within two hours after
collection using a Shimadzu Greenhouse Gas GC-14A. Interpolated maps were
made using ARGIS 9.1 Spatial Analyst Extension. Inverse distance weighing
(IDW) was used as the interpolation method. Overall, CO2 fluxes ranged from 11.86 to 172.90 mg C-CO2 m-2 h-1, N2O from
-5.72 to 18.80 ug N-N2O m-2 h-1 and CH4 uptake from -203.48 to -91.94 ug C-CH4 m-2 h-1.
Greenhouse gases fluxes were spatially distributed into three zones during
our first sampling on June 12th, with CO2, N2O emissions and CH4 uptake higher in the northern part of the
plot. However, this spatial pattern
shifted across sampling periods, from south on June 23rd to west and east in August. This study will
provide a better understanding of gas fluctuations in this forest and help
design future control strategies.
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