Land Degradation and Development,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 10, 2024
ABSTRACT
Iron
(Fe)
oxides
play
an
important
role
in
maintaining
soil
organic
carbon
(SOC)
stability.
However,
little
attention
has
been
paid
to
the
of
Fe
preserving
SOC
mangrove
wetlands
with
different
vegetation
communities.
In
this
study,
four
soils
dominant
communities:
Phragmites
australis
(PA),
Acanthus
ilicifolius
(AI),
Sonneratia
apetala
(SA),
and
mixed
S.
A.
(SA
+
AI)
were
selected
from
wetland
Qi'ao
Island.
The
distributions
Fe‐bound
(OC‐Fe)
(Fe
o
,
acid
oxalate‐extractable
Fe;
p
pyrophosphate‐extractable
Fe),
factors
conservation
investigated.
results
showed
that
OC‐Fe
content
ranged
1.03
4.96
g/kg,
a
contribution
ranging
5.97%
24.07%,
which
was
highest
SA
AI
(3.58
±
0.94
g/kg),
followed
by
PA
(2.67
1.07
(1.88
0.43
(1.82
0.32
g/kg).
higher
AI,
however,
lower.
Structural
equation
modeling
indicated
SOC,
direct
drivers
formation.
Overall,
aboveground
biomass
communities
indirectly
affected
regulating
inputs.
High
water
contents,
low
oxygen
conditions,
near‐neutral
favor
formation
between
co‐precipitation
or
complexation.
This
study
highlights
importance
Fe‐C
coupling,
while
providing
theoretical
support
for
cycling
processes
wetlands.
Frontiers in Marine Science,
Journal Year:
2024,
Volume and Issue:
11
Published: Sept. 4, 2024
Mangrove
forests
serve
as
significant
carbon
sinks
and
play
a
crucial
role
in
mitigating
climate
change.
Currently,
the
response
of
mangroves
to
intensified
change
human
activities,
factors
that
influence
magnitude
storage
their
sediments
remain
uncertain.
To
address
these
questions,
two
sediment
cores
were
collected
from
mangrove
reserve
Pearl
Bay,
Guangxi,
China.
The
activity
210
Pb
sediment,
grain
size,
bulk
elemental
composition,
stable
isotopes,
lignin,
different
organic
matter
(OM)
fractions
investigated
determine
local
mangrove’s
well
influencing
its
storage.
results
showed
with
lower
tidal
ranges,
slower
sedimentation
rates,
where
OM
predominantly
originated
locally
tend
have
larger
stocks.
(MOM)
decreased
progressively
bottom
top
cores,
indicating
Bay
possibly
undergone
degradation,
which
was
further
substantiated
by
decrease
lignin
content.
Based
on
results,
entire
divided
into
stages:
stage
1
(1963–2001)
degradation
2
(2001–2020).
cause
is
likely
due
impact
activities;
however,
impacts
are
anticipated
gradually
lessen
future
protection
policies.
Our
indicate
can
track
predict
growth
trends
provide
guidance
for
sustainable
management
ecosystems.
