Water,
Год журнала:
2024,
Номер
16(21), С. 3064 - 3064
Опубликована: Окт. 25, 2024
Carbon
burial
patterns
in
lakes
and
their
dynamic
changes
significantly
impact
terrestrial
carbon
sink
fluxes
global
budgets.
In
this
study,
multi-indicator
analysis
of
sediment
core
samples
(P1,
P2,
P3)
from
Pipahai
Lake
was
conducted.
Integrating
the
chronological
sequences
210Pb
137Cs,
we
identified
historical
spatial
characteristics
total
organic
(TOC)
inorganic
(TIC)
since
1884.
The
results
show
that
TOC
content
higher
than
TIC.
They
exhibited
an
increasing
trend
with
decreasing
depth.
Linear
regression
indicated
variation
is
less
directly
affected
by
precipitation
(R
=
0.39)
temperature
0.58),
while
may
have
a
greater
on
TOC.
From
1884
to
1995,
nutrients
were
not
primary
factor
influencing
synchronous
TIC
contents
reflects
contribution
external
inputs
basin.
After
1996,
begun
affect
variations
primarily
originates
distal
aeolian
transport
or
autochthonous
sources,
though
human
activity
has
played
role
its
evolution.
controlled
sources.
This
study
will
contribute
understanding
cycling
dynamics
mechanisms
high-altitude
lake
ecosystem.
The Science of The Total Environment,
Год журнала:
2024,
Номер
924, С. 171631 - 171631
Опубликована: Март 11, 2024
Soil
acidification
is
an
ongoing
problem
in
intensively
cultivated
croplands
due
to
inefficient
nitrogen
(N)
fertilization.
We
collected
high-resolution
data
comprising
19,969
topsoil
(0–20
cm)
samples
from
the
Land
Use
and
Coverage
Area
frame
Survey
(LUCAS)
of
European
commission
2009
calculate
impact
N
fertilization
on
buffering
substances
such
as
carbonates
base
cations.
have
only
considered
impacts
mineral
fertilizers
total
added
N,
a
use
efficiency
60
%.
Nitrogen
adds
annually
6.1
×
107
kmol
H+
croplands,
leading
annual
loss
109
kg
CaCO3.
Assuming
similar
during
last
50
years,
were
completely
removed
3.4
106
ha
croplands.
In
carbonate-free
soils,
2.1
basic
cations
will
lead
strong
at
least
2.6
million
within
next
years.
Inorganic
carbon
cation
losses
rapid
scale
tremendously
drop
nutrient
status
production
potential
liming
ameliorate
acidity
increases
pH
temporarily
with
additional
financial
environmental
costs.
Only
direct
soil
carbonate
stocks
compensation
carbonates-related
CO2
correspond
about
1.5
%
proposed
budget
for
2023.
Thus,
controlling
decreasing
crucial
avoid
degradation
agricultural
which
can
be
done
by
adopting
best
management
practices
increasing
efficiency.
Regular
screening
or
monitoring
contents,
especially
where
are
critical
levels
urgently
necessary.
Land Degradation and Development,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 24, 2025
ABSTRACT
Saline
soil
is
an
important
inorganic
carbon
pool
and
highly
susceptible
to
environmental
change.
The
Tarim
Basin
the
largest
inland
basin
around
world,
with
saline
land
making
up
approximately
20%
of
its
total
area,
while
few
research
has
been
conducted
on
salt‐affected
density
distribution
in
region.
To
identify
effect
salinity
density,
we
collected
135
profiles
(0–100
cm),
calculated
organic
(SOCD),
(SICD),
(STCD)
their
distribution,
discussed
relationships
climate
physicochemical
properties.
Results
showed
that
average
STCD,
SOCD,
SICD
at
0–100
cm
profile
were
25.0,
3.7,
21.3
kg
C
m
−2
,
respectively.
was
6.30–9.04
times
higher
than
SOCD.
vertical
SOCD
decreased
increasing
depth,
whereas
STCD
increased.
Soil
had
negative
effects
by
reducing
both
SICD,
impact
degrees.
Compared
non‐salinity,
10.5%,
7.0%
10.5%
under
light,
moderate,
severe
salinity,
Random
forest
analysis
indicated
nitrogen
content
(STN)
bulk
(BD)
most
predictor
variables
for
estimating
SICD.
significant
correlation
STN
BD,
resulting
a
Our
findings
emphasized
reduced
mainly
reduction
stocks
increased
degree.
In
addition,
mitigation
adverse
STC
could
be
considered
density.
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Фев. 10, 2025
Soil
erosion
contributes
to
the
irreversible
loss
of
soil
organic
carbon
(SOC)
into
rivers
(SOCR),
posing
risks
food
security
and
cycle
assessments.
Red
regions,
characterized
by
high
sink
potential
selenium
enrichment,
are
particularly
vulnerable.
However,
existing
studies
largely
rely
on
small-scale
experiments,
with
limited
understanding
basin-scale
SOCR
dynamics
their
driving
factors.
This
study
integrates
Water
Assessment
Tool
(SWAT)
for
sediment
yield
simulation
a
Organic
Carbon
Content
(SOCC)
model
quantify
at
basin
scale.
A
Random
Forest-based
prediction
was
developed
explore
spatial-temporal
variability
mechanisms
in
Dongjiang
River
Basin
(DRB),
representative
red
region
southern
China.
Results
indicate
significant
heterogeneity,
higher
observed
downstream,
human-disturbed
areas
during
flood
seasons.
The
demonstrates
excellent
performance
(R²>0.9).
Key
drivers
include
yield,
cultivated
land
area
(CULT),
urban
(TOWN),
urbanization
showing
stronger
sensitivity
than
cultivation
due
factors
such
as
city
size
impervious
surfaces.
proposed
framework
reveals
dynamic
change
characteristics
its
mechanism,
which
has
be
generalized
other
basins
similar
studies,
provides
technical
support
resource
management
cycling
erosion-prone
region.
