Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 23, 2025
Charosphere,
a
highly
active
zone
between
biochar
and
surrounding
soil,
is
widely
present
in
agricultural
wildfire-affected
soils,
yet
whether
reactive
oxygen
species
(ROS)
are
produced
within
the
charosphere
remains
unclear.
Herein,
production
spatiotemporal
evolution
of
ROS
were
explored.
In
situ
capture
visualized
gradual
decrease
with
increasing
distance
from
biochar/soil
interface.
Temporally,
O2•-
H2O2
contents
initially
increased
then
declined
incubation
time,
peaking
at
3.04
5.40
μmol
kg-1,
respectively,
while
•OH
content
decreased
continuously.
High-throughput
sequencing
revealed
that
dissolved
(DBC)
facilitated
by
promoting
growth
bacteria
electron-releasing
capacity,
such
as
Bacteroidetes,
Acidobacteria,
Actinobacteria,
Chloroflexi.
Additionally,
adding
electron
transfer-weakened
DBC
significantly
(ANOVA,
P
<
0.05),
demonstrating
also
served
shuttle
electron-storing
materials
to
promote
accelerating
transfer.
This
was
further
confirmed
via
fluorescence
imaging,
which
visually
showed
stronger
transfer
ability
near
soil/biochar
surface.
Inhibition
isotope
experiments
critical
role
CO2
emissions,
primarily
soil
organic
carbon.
study
highlights
prevalent
overlooked
hotspot,
advancing
our
understanding
carbon
turnover
soils.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(28), С. 12430 - 12440
Опубликована: Июль 5, 2024
Soil
organic
carbon
(SOC)
is
pivotal
for
both
agricultural
activities
and
climate
change
mitigation,
biochar
stands
as
a
promising
tool
bolstering
SOC
curtailing
soil
dioxide
(CO2)
emissions.
However,
the
involvement
of
in
dynamics
underlying
interactions
among
biochar,
microbes,
iron
minerals,
fresh
matter
(FOM,
such
plant
debris)
remain
largely
unknown,
especially
soils
after
long-term
amendment.
We
therefore
introduced
FOM
to
with
without
decade-long
history
amendment,
performed
microcosm
incubations,
evaluated
well
microbial
properties.
Biochar
amendment
resulted
2-fold
accrual
over
decade
attenuated
FOM-induced
CO2
emissions
by
approximately
11%
during
56-day
incubation
through
diverse
pathways.
Notably,
facilitated
microbially
driven
reduction
subsequent
Fenton-like
reactions,
potentially
having
enhanced
extracellular
electron
transfer
use
efficiency
long
run.
Throughout
cycling
processes,
physical
protection
minerals
could
contribute
accumulation
debris
preservation,
alongside
direct
adsorption
occlusion
particles.
Furthermore,
slurry
experiments,
sterilization
ferrous
stimulation
controls,
confirmed
role
microbes
hydroxyl
radical
generation
biotic
sequestration
biochar-amended
soils.
Overall,
our
study
sheds
light
on
intricate
abiotic
mechanisms
governing
upland
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(33), С. 14718 - 14725
Опубликована: Авг. 7, 2024
Cadmium
(Cd)
contamination
poses
a
significant
global
threat
to
human
health,
primarily
through
dietary
intake,
with
rice
serving
as
major
source.
While
Cd
predominantly
resides
in
bound
states
soil,
the
physiological
processes
by
which
facilitates
absorption
rhizosphere
remain
largely
elusive.
This
study
delves
into
mechanisms
governing
uptake
plants
rhizosphere,
emphasizing
impact
of
daytime
and
nighttime
fluctuations
microenvironmental
conditions.
Employing
microfluidic
chip
setup,
research
reveals
that
radial
oxygen
loss
from
roots
triggers
dissolution
rhizosphere.
Notably,
mobility
exhibits
distinct
diurnal
fluctuations,
peaking
at
44.0
±
4.1
nM
during
dropping
8.3
1.3
nighttime.
Further
investigations
reveal
variations
dissolved
hydroxyl
radical
concentrations
influence
release,
while
pH
changes
microbial
reduction
reactions
play
crucial
roles
immobilization.
These
findings
provide
insights
intricate
mobilization
highlighting
importance
regulating
these
for
effective
adsorption
control
crops
safeguarding
public
health.
Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 23, 2025
Charosphere,
a
highly
active
zone
between
biochar
and
surrounding
soil,
is
widely
present
in
agricultural
wildfire-affected
soils,
yet
whether
reactive
oxygen
species
(ROS)
are
produced
within
the
charosphere
remains
unclear.
Herein,
production
spatiotemporal
evolution
of
ROS
were
explored.
In
situ
capture
visualized
gradual
decrease
with
increasing
distance
from
biochar/soil
interface.
Temporally,
O2•-
H2O2
contents
initially
increased
then
declined
incubation
time,
peaking
at
3.04
5.40
μmol
kg-1,
respectively,
while
•OH
content
decreased
continuously.
High-throughput
sequencing
revealed
that
dissolved
(DBC)
facilitated
by
promoting
growth
bacteria
electron-releasing
capacity,
such
as
Bacteroidetes,
Acidobacteria,
Actinobacteria,
Chloroflexi.
Additionally,
adding
electron
transfer-weakened
DBC
significantly
(ANOVA,
P
<
0.05),
demonstrating
also
served
shuttle
electron-storing
materials
to
promote
accelerating
transfer.
This
was
further
confirmed
via
fluorescence
imaging,
which
visually
showed
stronger
transfer
ability
near
soil/biochar
surface.
Inhibition
isotope
experiments
critical
role
CO2
emissions,
primarily
soil
organic
carbon.
study
highlights
prevalent
overlooked
hotspot,
advancing
our
understanding
carbon
turnover
soils.
