Water,
Journal Year:
2025,
Volume and Issue:
17(4), P. 571 - 571
Published: Feb. 17, 2025
Seaweed
plays
a
critical
role
in
marine
carbon
sequestration
due
to
its
high
release
rate
of
organic
matter.
However,
the
impacts
Porphyra
cultivation
on
concentration
and
composition
dissolved,
particulate
sedimentary
matter
(DOM,
POM
SOM)
coastal
zones
remain
unclear.
Herein,
we
investigated
optical
properties
DOM,
SOM
along
transect
from
subtropical
Chi
River
adjacent
zone
Dayu
Bay
(southeast
China)
during
late
stage.
The
results
revealed
that
all
types
were
predominantly
characterized
by
highly
autochthonous
sources,
contrasting
sharply
with
allochthonous,
terrestrial
sources
observed
at
freshwater
sites.
estuarine
mixing
model
principal
component
analysis
further
indicated
dynamics
are
primarily
controlled
cultivation,
relatively
limited
contributions
riverine
inputs,
sediment
porewater
sources.
leads
significant
additions
protein-like
components
water
sediment.
Microbial
degradation
incubations
DOM
demonstrated
promotes
situ
production
humic-like
(peak
M)
water.
exhibited
higher
microbial
transformation
efficiency
into
refractory
than
POM,
suggesting
more
substantial
sequestration.
Our
findings
underscore
potential
enhance
ecosystems.
Limnology and Oceanography,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Abstract
Hydrothermal
transformations
of
dissolved
organic
matter
(DOM)
are
governed
by
temperature
and
sedimentary
carbon
content,
resulting
in
the
release
hydrothermal
DOM
containing
bioavailable
compounds
fueling
benthic
microbes.
However,
temperature‐dependent
molecular
changes
porewater
from
organic‐rich
sediments,
extent
to
which
these
contribute
marine
recalcitrant
DOM,
remain
largely
unexplored.
Here
we
investigated
composition
bottom
water
samples
Guaymas
Basin,
Gulf
California,
where
basaltic
sill
intrusions
generate
petroleum
sediments.
Samples
with
situ
temperatures
4°C
>
106°C
were
analyzed
using
Fourier‐transform
ion
cyclotron
resonance
mass
spectrometry
parallel
factor
analysis
excitation‐emission
matrices
fluorescent
(FDOM).
We
found
that
was
strongly
influenced
dissolution,
evidenced
enrichment
highly
unsaturated,
oxygen‐depleted
aromatic,
sulfur‐containing
formulae
petroleum‐associated
FDOM
compared
a
cold
reference
site.
In
waters,
accounted
for
~
26%
formulae,
82%
exhibiting
hydrogen‐to‐carbon
ratios
<
1.5,
indicating
their
recalcitrance.
The
remaining
18%
aliphatic
saturated,
representing
ocean.
Our
results
show
sediments
source
both
releasing
water‐soluble
petroleum‐derived
deep
study
highlights
need
more
quantitative
research
on
contribution
deep‐sea
cycling.
Water,
Journal Year:
2025,
Volume and Issue:
17(4), P. 571 - 571
Published: Feb. 17, 2025
Seaweed
plays
a
critical
role
in
marine
carbon
sequestration
due
to
its
high
release
rate
of
organic
matter.
However,
the
impacts
Porphyra
cultivation
on
concentration
and
composition
dissolved,
particulate
sedimentary
matter
(DOM,
POM
SOM)
coastal
zones
remain
unclear.
Herein,
we
investigated
optical
properties
DOM,
SOM
along
transect
from
subtropical
Chi
River
adjacent
zone
Dayu
Bay
(southeast
China)
during
late
stage.
The
results
revealed
that
all
types
were
predominantly
characterized
by
highly
autochthonous
sources,
contrasting
sharply
with
allochthonous,
terrestrial
sources
observed
at
freshwater
sites.
estuarine
mixing
model
principal
component
analysis
further
indicated
dynamics
are
primarily
controlled
cultivation,
relatively
limited
contributions
riverine
inputs,
sediment
porewater
sources.
leads
significant
additions
protein-like
components
water
sediment.
Microbial
degradation
incubations
DOM
demonstrated
promotes
situ
production
humic-like
(peak
M)
water.
exhibited
higher
microbial
transformation
efficiency
into
refractory
than
POM,
suggesting
more
substantial
sequestration.
Our
findings
underscore
potential
enhance
ecosystems.
