Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Dec. 30, 2024
Exploring
the
components
of
soil
organic
carbon
(SOC)
and
aggregate
stability
across
different
elevations
is
crucial
to
assessing
SOC
in
subtropical
forest
ecosystems
under
climate
change.
In
this
study,
we
investigated
spatial
variation
active
(C)
compositions,
distribution,
Chinese
fir
(Cunninghamia
lanceolata)
plantations
an
elevation
gradient
from
750
1150
m
a.s.l.
on
northern
foothills
Dabie
Mountains,
China.
The
results
showed
that
macroaggregates
accounted
for
more
than
80%
all
fractions
at
elevations.
0-10
cm
layer,
macroaggregates,
mean
weight
diameter
(MWD),
geometric
(GMD),
exhibited
a
U-shaped
distribution
trend
with
increasing
elevation.
Conversely,
10-50
these
indicators
consistent
trend.
Similarly,
contents
easily
oxidizable
(EOC)
particulate
(POC)
gradually
increased
Microbial
biomass
(MBC)
silt
+
clay
C
unimodal
pattern
along
elevational
gradient,
peaking
850
a.s.l.,
which
mainly
related
pH
C/N
ratio.
Across
elevations,
was
significantly
higher
macro-
micro-aggregate
C.
Macro-
C,
dissolved
(DOC)
were
positively
correlated
MWD.
demonstrated
layer
have
significant
effects
stability.
physical
protection
pools
may
be
main
mechanisms
preservation
Mountains.
These
contribute
further
deepening
impact
change
cycling
ecosystems.
Land Degradation and Development,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 28, 2025
ABSTRACT
Soil
organic
carbon
(SOC)
stabilization
is
vital
for
the
mitigation
of
global
climate
change
and
retention
soil
stocks.
The
Loess
Plateau
a
crucial
ecological
zone
in
China
even
worldwide
major
ecosystem
protection.
However,
Plateau,
there
are
knowledge
gaps
about
response
SOC
sources
to
different
transitions
jujube
economic
forests.
Therefore,
our
study
used
clean‐cultivated
orchards
as
control
(CK)
selected
five
main
transformation
models
abandoned
on
Lvliang
Mountain:
farmland
(AF),
replanted
with
Astragalus‐Bupleurum
(AB),
alfalfa
(AL),
Chinese
pine
(CP),
arborvitae
(PO).
properties,
physical
fractions
their
correlations
0‐
20‐cm
layer
at
each
sample
site
were
analyzed.
results
show
that
significantly
increased
by
affecting
plant‐
microbe‐derived
altering
its
components.
Different
treatments
have
varying
impacts
content.
lignin
phenol
(VSC)
content
soils
was
greater
than
CK
had
following
ranking:
CP
>
AL
PO
AF
AB
(
p
<
0.05).
also
total
amino
sugar
(TAS)
content,
microbial
residue
(MRC),
contribution
carbon.
Additionally,
it
promoted
accumulation
particulate
(POC)
mineral‐associated
(MAOC)
positively
impacted
stability.
Among
models,
greatest
impact
phenols,
sugars,
stability,
whereas
contributed
least
SOC.
this
provide
scientific
basis
assess
select
optimal
modes
commercial
Research Square (Research Square),
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 27, 2025
Abstract
Background
and
aims
Nitrogen
(N)
addition
can
substantially
affect
soil
carbon
cycling
in
agroecosystems.
Microbial
necromass
(MNC)
is
widely
recognized
as
a
key
contributor
to
organic
C
(SOC)
fractions.
However,
the
mechanisms
underlying
responses
of
MNC
SOC
fractions
N
fertilization
paddy
soils
remain
unclear.
Methods
A
field
experiment
with
four
rates,
namely,
0,
300,
450,
600
kg
ha–1
yr–1
was
conducted
determine
effects
on
fractions,
microbial
(MNC),
enzyme
activity,
biomass
rice–wheat
rotation.
Results
increased
POC
concentrations
by
2.88–8.41%
14.6–41.2%,
respectively,
but
did
not
MAOC.
The
ratio
MAOC
reduced
addition,
indicating
that
decreased
stability.
concentration
7.32–22.5%
its
contribution
4.14–13.7%.
activity
β-1,4-N-acetyl-glucosaminidase
decreased,
while
activities
leucine
amino
peptidase
acid
phosphatase
were
under
P
addition.
Structural
equation
modeling
random
forest
revealed
N-induced
decrease
pH
promoted
accrual
increasing
root
biomass,
consequently
improving
POC.
Conclusions
likely
more
vulnerable
than
acidification
primary
driver
for
promoting
soils.
