European Journal of Soil Science,
Journal Year:
2023,
Volume and Issue:
74(4)
Published: July 1, 2023
Abstract
The
influence
of
redox
reactions
involving
carbon‐iron
coupling
(organic
carbon
and
iron
oxides)
on
nitrous
oxide
(N
2
O)
production
in
paddy
soils
remains
poorly
understood.
In
this
study,
two
microcosm
experiments
were
conducted
to
investigate
the
effects
N
O
emissions,
underlying
mechanisms
verified
using
quantitative
denitrification
functional
genes
(
nirS
,
nirK
nosZ
I
II)
high‐throughput
sequencing.
results
showed
that
ferrihydrite
(iron)
significantly
promoted
O‐N
emissions
p
<
0.05)
after
adding
ammonium
nitrogen,
while
glucose
(carbon)
inhibited
0.05).
Carbon‐iron
decreased
but
did
not
affect
soil
total
nitrogen
loss
increased
)
emissions.
After
high
concentrations
acetylene
(10%
C
H
),
from
treatment
6.4
11.9
mg
kg
−1
0.05),
which
confirmed
reduced
by
promoting
conversion
.
behind
complete
reducing
attributed
reduction
enhancing
abundance
(42.7%)
II
(16.6%).
Global Change Biology,
Journal Year:
2024,
Volume and Issue:
30(6)
Published: June 1, 2024
Priming
of
soil
organic
matter
(SOM)
decomposition
by
microorganisms
is
a
key
phenomenon
global
carbon
(C)
cycling.
Soil
pH
main
factor
defining
priming
effects
(PEs)
because
it
(i)
controls
microbial
community
composition
and
activities,
including
enzyme
(ii)
defines
SOM
stabilization
destabilization
mechanisms,
(iii)
regulates
intensities
many
biogeochemical
processes.
In
this
critical
review,
we
focus
on
prerequisites
mechanisms
PE
depending
assess
the
change
consequences
for
PE.
The
highest
PEs
were
common
in
soils
with
between
5.5
7.5,
whereas
low
molecular
weight
compounds
triggered
mainly
slightly
acidic
soils.
Positive
up
to
20
times
before
C
input
at
around
6.5.
Negative
below
4.5
or
above
7
reflecting
suboptimal
environment
specific
high
pH.
Short-term
acidification
(in
rhizosphere,
after
fertilizer
application)
affects
by:
mineral-SOM
complexation,
oxidation
iron
reduction,
enzymatic
depolymerization,
pH-dependent
changes
nutrient
availability.
Biological
processes
metabolism
shift
over
short-term,
long-term
adaptations
slow
are
common.
nitrogen
fertilization
induced
land
use
intensification
strongly
decrease
thus
boost
Concluding,
one
strongest
but
now
disregarded
factors
PE,
through
short-term
metabolic
adaptation
groups
communities.
Agricultural Water Management,
Journal Year:
2024,
Volume and Issue:
298, P. 108839 - 108839
Published: April 30, 2024
Iron
(Fe)
and
methane
(CH4)
emissions
play
crucial
roles
in
the
carbon
cycling
of
paddy
field
ecosystems.
However,
little
is
known
about
effect
mechanism
Fe
transformation
on
CH4
emission
from
fields,
especially
with
different
water
management
methods.
In
this
study,
dynamic
changes
forms
soil
organic
content
were
observed
fields
under
flooded
irrigation
(FI)
water-saving
(WSI)
(including
intermittent
(II)
controlled
(CI)).
addition,
structural
equation
model
was
used
to
clarify
response
relationship
between
ions
fields.
The
results
indicate
that
cumulative
WSI
reduced
by
29.03–61.29
%.
reasons
are
as
follows
(i)
increased
oxidation
ability
increasing
ferric
iron
(Fe3+)
fields;
(ii)
could
reduce
substrate
utilization
methanogens
transforming
oxide
increase
binding
capacity
dissolved
carbon,
which
production.
compared
II,
CI
had
higher
Fe3+
content,
Fe-bound
lower
acetate
so
it
production
capacity.
summary,
promotes
direct
indirectly
reduces
facilitating
combination
oxides
substrates.
These
findings
deepen
our
understanding
mechanisms
provide
new
insights
for
research
sequestration
reduction
