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Abstract
Robert, P., N. Nkongolo,
S. Johnson and F. Eivazi. 2007. Spatial variability of CO2, CH4
and N2O fluxes and soil thermal properties of a secondary forest
soil in Central Missouri. JEMREST 3:42-52.
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 µg 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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