Journal of Advances in Modeling Earth Systems,
Journal Year:
2024,
Volume and Issue:
17(1)
Published: Dec. 29, 2024
Abstract
Enhanced
weathering
(EW)
is
a
promising
strategy
to
remove
atmospheric
by
amending
agricultural
and
forestry
soils
with
ground
silicate
rocks.
However,
current
model‐based
EW
assessments
face
large
uncertainties
stemming
from
the
intricate
interplay
among
soil
processes,
compounded
absence
of
detailed
comparison
available
observational
data.
Here,
we
address
this
critical
gap
first
advancing
dynamic,
ecohydrological,
biogeochemical
Soil
Model
for
Weathering
(SMEW).
We
then
conduct
hierarchical
model‐experiment
four
experimental
data
sets
increasing
complexity,
simple
closed
incubation
systems
open
mesocosm
experiments.
The
demonstrates
SMEW's
ability
capture
dynamics
primary
variables,
including
moisture,
alkalinity,
inorganic
carbon.
also
reveals
that
rates
are
consistently
lower
than
traditionally
assumed
up
two
orders
magnitude.
finally
discuss
implications
carbon
removal
scenarios
avenues
further
theoretical
explorations.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: Jan. 24, 2025
Abstract
Thawing
Arctic
permafrost
can
induce
hydrologic
change
and
alter
redox
conditions,
shifting
the
balance
of
soil
organic
matter
(SOM)
decomposition.
There
remains
uncertainty
about
how
saturation
transitions
impact
dissolved
gas
phase
carbon
fluxes,
efforts
to
link
hydrobiogeochemical
processes
ecosystem-scale
models
are
limited.
This
study
evaluates
SOM
decomposition
tundra
soils
using
column
experiments,
water
chemistry
measurements,
microbial
community
analysis,
a
PFLOTRAN
reactive
transport
model.
Soil
columns
from
thermokarst
channel
(TC)
an
upland
(UC)
were
exposed
cycles
drainage,
which
controlled
emissions.
During
saturation,
outflow
UC
correlated
with
elevated
reduced
iron
decreased
pH;
during
dioxide
fluxes
70%
higher
than
TC
fluxes.
Intermittent
methane
release
was
observed
for
TC,
consistent
methanogen
abundance.
Slower
drainage
in
more
subtle
biogeochemical
changes.
simulations
captured
experimental
trends
oxygen
concentrations,
contents.
The
model
then
used
evaluate
additional
rates.
emphasizes
importance
considering
when
evaluating
simulating
dynamic
environments.
ACS Agricultural Science & Technology,
Journal Year:
2024,
Volume and Issue:
4(3), P. 307 - 316
Published: March 4, 2024
Quantifying
redox-driven
changes
in
iron
chemistry
irrigated
semiarid
to
arid
soils
and
their
relevance
for
the
availability
of
nutrients
contaminants
is
critical
global
food
security.
Data
across
three
growing
seasons
two
different
soil
types
climates
indicate
site-independent
peaks
reactive
aligned
with
irrigation
events.
The
formed
during
was
short-lived,
concentration
back
at
baseline
harvest.
significant
(p
<
0.01)
increase
ranging
from
1589.0
±
172.3
1898.0
201.1
μg
g–1
over
season
triggered
by
reducing
conditions
due
transient
water
infiltration
resulted
mobilization
organic
carbon
affected
mobility
plant
nitrogen,
uranium,
arsenic.
Porewater
samples
collected
events
demonstrated
increasing
concentrations
time
positively
correlated
0.05)
arsenic
uranium
levels.
Geogenic
into
porewater
peak
contained
significantly
higher
(∼90%)
reduced
inorganic
species.
Crop
tissue
analysis
indicated
that
roots
highest
trace
elements,
followed
shoots
grains.
Coupled
(bio)geochemical
redox
cycles
iron,
nutrients,
seem
play
a
but
so
far
less
recognized
role
crop
production
agroecosystems
systems.
Water Resources Research,
Journal Year:
2024,
Volume and Issue:
61(1)
Published: Dec. 26, 2024
Abstract
The
dissolution
of
sulfide
minerals
in
subsurface
porous
media
has
important
environmental
implications.
We
investigate
the
oxidative
pyrite
under
evaporative
conditions
and
advance
a
mechanistic
understanding
interactions
between
multiple
physical
processes
mineral/surface
reactions.
performed
set
experiments
which
initially
water
saturated
anoxic
soil
columns,
containing
top
layer
pyrite,
are
exposed
to
atmosphere
no
evaporation
(single‐phase)
natural
(two‐phase)
conditions.
was
monitored
by
non‐invasive
high‐resolution
measurements
oxygen
pH.
Additionally,
we
developed
applied
multiphase
multicomponent
reactive
transport
model
quantitatively
describe
experimental
outcomes
elucidate
interplay
physico‐chemical
mechanisms
controlling
extent
dissolution.
results
confirm
that
single‐phase
constrained
slow
diffusive
liquid
phase.
In
contrast,
during
evaporation,
evolution
fluid
phases
interphase
mass
transfer
imposed
distinct
constraints
on
dynamics
oxidation.
Initially,
invasion
gaseous
phase
led
fast
delivery
high
concentrations
zone
thus
markedly
increased
oxidation
acidity/sulfate
production.
However,
such
enhanced
release
reaction
products
progressively
limited
over
time
as
drying
prevailed
inhibited
transient
displacement
also
found
control
distribution
aqueous
species
formation
secondary
creating
spatio‐temporally
variable
redox
Authorea (Authorea),
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 18, 2024
Enhanced
weathering
(EW)
is
a
promising
strategy
to
remove
atmospheric
CO2
by
amending
agricultural
and
forestry
soils
with
ground
silicate
materials.
However,
the
current
model-based
assessments
of
EW
potential
face
uncertainties
stemming
from
intricate
interplay
among
soil
physical,
chemical,
biotic
processes,
compounded
absence
detailed
model-data
comparison,
mostly
due
limited
availability
comprehensive
data.
Here,
we
address
this
critical
gap
advancing
validating
an
ecohydrological
biogeochemical
model
for
dynamics
in
soils.
We
conduct
hierarchical
validation
which
results
are
critically
compared
four
experimental
datasets
increasing
complexity,
simple
closed
incubation
systems
open
mesocosm
experiments.
The
comparison
demonstrates
ability
capture
primary
variables,
including
rock
alkalinity
release
sequestration.
also
reveals
that
rates
consistently
lower
than
traditionally
assumed
up
two
orders
magnitude.
finally
discuss
avenues
further
theoretical
explorations.
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: April 11, 2024
The
soil
microbial
community
is
structured
by
several
factors
including
environmental
conditions
such
as
varying
water
content,
dissolved
oxygen,
and
redox
potential.
Here,
we
experimentally
investigate
the
impact
of
regimes,
i.e.,
oxic,
fluctuating,
or
anoxic
conditions,
on
composition
probe
widespread
hypothesis
that
diversity
fluctuating
layer
greater
than
zones
with
static
conditions.
A
50-cm
homogenized
column
was
subjected
to
realistic
intermittent
artificial
precipitation
for
3
months
hydrological
geochemical
parameters
(redox
potential,
pH,
moisture,
matric
chemical
speciation)
measured
a
function
time
depth.
change
in
over
3-month
experiment
distinct
three
zones.
oxic
zone
exhibited
increased
biomass
highest
diversity,
fluctuation
less
growth
characterized
little
minimal
diversity.
Interestingly,
microbiomes
most
resembled
initial
soil.
Rather
potential
alone,
vertical
DOC
gradients
were
found
dominate
compositional
trajectory
microbiome.
Additionally,
this
work
validated
recently
developed
spatially
explicit
biogeochemical
model
both
data
revealed
horizontal
characteristics
under
regimes.
