Vadose Zone Journal,
Journal Year:
2025,
Volume and Issue:
24(1)
Published: Jan. 1, 2025
Abstract
Microscale
O
2
availability
in
soil,
a
main
factor
influencing
microbial
processing
of
soil
carbon
and
nitrogen,
is
function
diffusion
consumption.
While
diffusivity
widely
studied,
it
difficult
to
quantify
the
rate
consumption
(
MO
).
In
this
study,
we
quantified
using
microsensor
profiling
compare
different
soils
vegetation
systems
while
manipulating
pore
structure.
Soil
samples
were
collected
from
three
bioenergy
systems,
sorghum
Sorghum
bicolor
L.
Moench),
switchgrass
Panicum
virgatum
L.),
prairie,
at
an
experimental
site
Southeast
Michigan,
prairie
two
sites
South
North
Wisconsin.
We
prepared
cores
with
contrasting
structures,
that
is,
large
(>30
µm
Ø)
pore‐dominated
(LP)
small
(<10
(SP),
same
1‐
2‐mm
size
fraction.
(nmol
cm
−3
s
−1
)
microprofiler
oxygen
(OX‐100
µm)
(Unisense)
pre‐
post‐38‐day
incubation.
Across
all
studied
there
was
trend
for
decrease
SP
post‐incubation,
suggesting
change
metabolism
lower
utilization.
However,
sizeable
continued
LP
soils,
further
corroborated
by
positive
correlation
between
C‐CO
emission
post‐incubation
,
highlighting
provided
better
physical
microenvironment
microbes.
