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
Abstract
Aims
Plant-
and
microbial-derived
carbon
(C)
are
the
primary
sources
of
soil
organic
(SOC)
in
coastal
wetlands,
yet
their
contributions
across
vegetation
restoration
chronosequences
remain
poorly
understood.
Methods
Using
biomarker
approaches,
we
investigated
dynamics
total
lignin
phenols
(VSC)
microbial
necromass
C
(MNC)
SOC
over
a
20-year
chronosequence
(0,
4,
8,
11,
20
years)
Yellow
River
Delta
China.
Results
Vegetation
significantly
increased
VSC
MNC
contents,
but
both
showed
unimodal
patterns
with
age
peaked
at
8
years.
Restoration
to
(1.9–7.1%)
had
limited
effects
on
MNC,
which
averaged
28.64%—lower
than
anticipated.
The
contents
VSC,
vanillyl
phenols,
syringyl
cinnamyl
fungal
(FNC)
biomass
(MBC)
were
positively
correlated
content.
However,
Bacterial
(BNC)
no
significant
correlation
SOC.
Plant
coverage
C/N
ratio
main
drivers
source
changes,
showing
positive
negative
linear
relationships
content,
respectively.
Structural
equation
model
that
plant-derived
is
most
important
driver
SOC,
while
has
effect
Conclusions
Although
response
age,
Increasing
affected
by
plant
cover
enhanced
sequestration
compared
C.
