Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
58(31), P. 13772 - 13782
Published: July 26, 2024
Dissolved
organic
matter
(DOM),
the
most
reactive
fraction
of
forest
soil
matter,
is
increasingly
impacted
by
wildfires
worldwide.
However,
few
studies
have
quantified
temporal
changes
in
DOM
quantity
and
quality
after
fire.
Here,
samples
were
collected
Qipan
Mountain
Fire
(3-36
months)
from
pairs
burned
unburned
sites.
contents
characteristics
analyzed
using
carbon
quantification
various
spectroscopic
spectrometric
techniques.
Compared
with
sites,
sites
showed
higher
bulk
components
3
months
fire
but
lower
them
6-36
During
sharp
drop
to
6
fire,
carboxyl-rich
alicyclic
molecule-like
highly
unsaturated
compounds
had
greater
losses
than
condensed
aromatics.
Notably,
consistently
abundances
oxygen-poor
dissolved
black
nitrogen
fluorescent
3-36
particularly
abundance
pyrogenic
C2
(excitation/emission
maxima
<250/∼400
nm)
that
increased
150%
before
gradually
declining.
This
study
advances
understanding
variations
effects
on
different
components,
which
crucial
for
future
postfire
environmental
management.
Eco-Environment & Health,
Journal Year:
2023,
Volume and Issue:
2(4), P. 227 - 234
Published: Aug. 30, 2023
Both
biotic
and
abiotic
mechanisms
play
a
role
in
soil
CO2
emission
processes.
However,
abiotically
mediated
the
of
reactive
oxygen
species
are
still
poorly
understood
paddy
soil.
This
study
revealed
that
•OH
promoted
slurries
during
short-term
oxidation
(4
h).
generation
was
highly
hinged
on
active
Fe(II)
content,
contribution
to
efflux
10%–33%
topsoil
40%–77%
deep-soil
slurries.
Net
higher
slurries,
which
contained
more
dissolved
organic
carbon
(DOC).
correlated
well
with
DOC
contents,
suggesting
critical
DOC.
Microbial
contributed
9%–45%
production,
as
estimated
by
γ-ray
sterilization
experiments
reoxidation
process.
Solid-aqueous
separation
showed
significant
reduction
net
across
all
after
removal
original
aqueous
phase,
indicating
water
phase
main
source
(>50%).
Besides,
C
greatly
affected
pH
fluctuation
acidic
but
not
neutral/alkaline
soils.
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
excitation-emission
matrix
results
indicated
recalcitrant
macromolecular
matter
(DOM)
components
were
easily
removed
or
attacked
•OH.
The
decrease
DOM
content
combined
result
oxidation,
co-precipitation,
release.
emphasizes
significance
generally
overlooked
nonmicrobial
promoting
global
cycle,
influence
loss
environments.
Global Change Biology,
Journal Year:
2024,
Volume and Issue:
30(1)
Published: Jan. 1, 2024
Abstract
Crop
residue‐derived
carbon
(C)
emissions
and
priming
effects
(PE)
in
cropland
soils
can
influence
the
global
C
cycle.
However,
their
corresponding
generality,
driving
factors,
responses
to
nitrogen
(N)
inputs
are
poorly
understood.
As
a
result,
total
net
balance
also
remain
mysterious.
To
address
above
knowledge
gaps,
meta‐analysis
of
1123
observations,
taken
from
51
studies
world‐wide,
has
been
completed.
The
results
showed
that
within
360
days,
emission
ratios
crop
residues
(ER)
ranged
0.22%
61.80%,
generally
induced
positive
PE
(+71.76%).
Comparatively,
contribution
(52.82%)
was
higher
than
(12.08%),
emphasizing
importance
reducing
ER.
ER
differed
among
types,
both
were
low
case
rice,
which
attributed
its
saturated
water
conditions.
varied
with
soil
properties,
as
decreased
increasing
addition
ratio
where
organic
(SOC)
less
10‰;
contrast,
opposite
phenomenon
observed
SOC
exceeding
10‰.
Moreover,
N
increased
by
8.31%
3.78%,
respectively,
predominantly
(NH
4
)
2
SO
.
verified
be
dominated
microbial
stoichiometric
decomposition.
In
summary,
after
incorporating
residues,
relative
0.03
23.47
mg
g
−1
0.21
0.97
residue‐C
soil,
suggesting
significant
impact
on
These
clarify
value
into
croplands
regulate
dynamics
help
establish
while
managing
site‐specific
return
systems
facilitate
sequestration.
ISME Communications,
Journal Year:
2024,
Volume and Issue:
4(1)
Published: Jan. 1, 2024
Abstract
Northern
peatlands
contain
~30%
of
terrestrial
carbon
(C)
stores,
but
in
recent
decades,
14%
to
20%
the
stored
C
has
been
lost
because
conversion
peatland
cropland.
Microorganisms
are
widely
acknowledged
as
primary
decomposers,
keystone
taxa
within
bacterial
community
regulating
loss
from
cultivated
remain
largely
unknown.
In
this
study,
we
investigated
driving
peat
mineralization
during
rice
cultivation.
Cultivation
significantly
decreased
concentrations
soil
organic
C,
dissolved
(DOC),
carbohydrates,
and
phenolics
increased
rate
(CMR).
Consistent
with
classic
theory
that
phenolic
inhibition
creates
a
“latch”
reduces
decomposition,
were
highly
negatively
correlated
CMR
peatlands,
indicating
elimination
inhibitory
can
accelerate
mineralization.
Bacterial
communities
different
following
cultivation,
co-occurrence
diagnosis
analysis
revealed
substantial
changes
network
clusters
closely
connected
nodes
(modules)
taxa.
Specifically,
modules
phenolics,
DOC.
While
Xanthomonadales,
Arthrobacter,
Bacteroidetes_vadinHA17
regulate
promote
Those
observations
indicated
decomposition
eliminate
labile
thus
accelerating
Overall,
study
provides
deeper
insights
into
microbe-driven
cultivation
highlights
crucial
role
removal
constraints
on
preservation.
