Global Change Biology,
Год журнала:
2025,
Номер
31(3)
Опубликована: Март 1, 2025
ABSTRACT
Soil
dissolved
organic
matter
(DOM)
is
a
critical
reservoir
of
carbon
and
nutrients
in
forest
ecosystems,
playing
central
role
cycling
microbial
community
dynamics.
However,
the
influence
DOM
molecular‐level
diversity
(chemodiversity)
on
spatial
distribution
remains
poorly
understood.
In
this
study,
we
used
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
high‐throughput
sequencing
to
analyze
soil
along
~4,000
km
transect
China.
We
found
that
chemodiversity
varies
significantly
across
sites,
initially
increasing
then
decreasing
with
latitude.
Additionally,
observed
biogeographic
components
has
differential
effects
bacterial
fungal
diversity:
lipid‐like
compounds
are
strongly
associated
diversity,
while
aromatic‐,
carbohydrate‐,
primarily
diversity.
Linear
models
structural
equation
modeling
both
reveal
acts
as
key
intermediary,
mediating
temperature
properties
distribution.
Our
findings
emphasize
importance
molecular
characteristics
shaping
structure
functioning,
providing
new
insights
into
how
environmental
factors
ecosystems
cycles
ecosystems.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(26), С. 11436 - 11446
Опубликована: Июнь 21, 2024
The
frequency
and
intensity
of
global
wildfires
are
escalating,
leading
to
an
increase
in
derived
pyrogenic
dissolved
organic
matter
(pyDOM),
which
potentially
influences
the
riverine
carbon
reservoir
poses
risks
drinking
water
safety.
However,
changes
pyDOM
properties
as
it
traverses
through
soil
bodies
highly
understudied
due
challenges
simulating
such
processes
under
laboratory
conditions.
In
this
study,
we
extracted
DOM
along
hillslope
gradients
depths
both
burned
unburned
catchments
post
wildfire.
Using
high-resolution
mass
spectrometry
a
substrate-explicit
model,
observed
significant
increases
relative
abundance
condensed
aromatics
(ConAC)
tannins
wildfire-affected
DOM.
Wildfire-affected
also
displayed
broader
spectrum
molecular
thermodynamic
properties,
indicative
its
diverse
composition
reactivity.
Furthermore,
fire-induced
weakening
topsoil
microbial
reprocessing
abilities
hindered
transformation
plant-derived
DOM,
lignin-like
compounds
increased
with
depth
fire
regions.
Meanwhile,
distribution
shared
formulas
gradient
(from
shoulder
toeslope)
exhibited
analogous
patterns
catchments.
Although
there
was
prevalence
ConAC
tannin
catchments,
these
fractions
diminished
all
three
Based
on
biodegradability
by
offers
possibility
conversion
hillslopes.
Our
findings
reveal
spatial
after
wildfire,
facilitating
accurate
evaluation
involved
watershed-scale
cycle.
Global Biogeochemical Cycles,
Год журнала:
2024,
Номер
38(10)
Опубликована: Окт. 1, 2024
Abstract
Microbes
are
the
drivers
of
soil
phosphorus
(P)
cycling
in
terrestrial
ecosystems;
however,
role
microbes
mediating
P
P‐rich
soils
during
primary
succession
remains
uncertain.
This
study
examined
impacts
bacterial
community
structure
(diversity
and
composition)
its
functional
potential
(absolute
abundances
P‐cycling
genes)
on
along
a
130‐year
glacial
chronosequence
eastern
Tibetan
Plateau.
Bacterial
was
better
predictor
fractions
than
genes
chronosequence.
After
glacier
retreat,
solubilization
inorganic
mineralization
organic
were
significantly
enhanced
by
increased
diversity,
changed
interspecific
interactions,
abundant
species
involved
mineralization,
thereby
increasing
availability.
Although
84%
associated
with
these
more
closely
carbon
P.
demand
probably
determined
turnover,
indicating
dominant
matter
decomposition
processes
alpine
soils.
Moreover,
significant
decrease
complexity
co‐occurrence
network
taxa‐gene‐P
at
later
stage
indicates
declining
dominance
driving
succession.
Our
results
reveal
that
bacteria
complex
have
prominent
for
biogeochemical
early
stages
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(13), С. 5899 - 5910
Опубликована: Март 19, 2024
The
established
benefits
of
ozone
on
microbial
pathogen
inactivation,
natural
organic
matter
degradation,
and
inorganic/organic
contaminant
oxidation
have
favored
its
application
in
drinking
water
treatment.
However,
viable
bacteria
are
still
present
after
the
ozonation
raw
water,
bringing
a
potential
risk
to
membrane
filtration
systems
terms
biofilm
accumulation
fouling.
In
this
study,
we
shed
light
role
specific
dose
(0.5
mg-O3/mg-C)
during
long-term
ultrafiltration.
Results
demonstrated
that
transformed
molecular
structure
influent
dissolved
(DOM),
producing
fractions
were
highly
bioavailable
at
0.5,
which
was
inferred
be
turning
point.
With
increase
dose,
consortium
substantially
shifted,
demonstrating
decrease
richness
diversity.
Unexpectedly,
opportunistic
Legionella
stimulated
occurred
approximately
40%
relative
abundance
higher
1.
Accordingly,
system
with
0.5
presented
lower
thickness,
weaker
fluorescence
intensity,
smaller
concentrations
polysaccharides
proteins,
Raman
activity,
leading
hydraulic
resistance,
compared
Our
findings
highlight
interaction
mechanism
between
molecular-level
DOM
composition,
consortium,
performance,
provides
an
in-depth
understanding
impact
accumulation.
Dissolved
organic
matter
(DOM)
is
an
important
geochemical
feature
connecting
pollutants
and
microorganisms
in
groundwater.
However,
the
patterns
of
DOM–microbial
community
interactions
caused
by
spatial
distribution
differences
remain
unclear,
necessitating
construction
a
correlation
network
to
elucidate
relationships
between
DOM
accurately
predict
biodegradation
process
pollutants.
This
study
selected
chlorobenzene
(CBs)-contaminated
bioremediation
site
analyze
fluorescent
components
molecular
structures
Microbial
metabolic
activities
were
more
active
areas
with
high
CBs
concentration,
leading
significant
microbial
source
contributions
DOM.
Intense
degradation
processes
accompanied
transformation
highly
oxidized
unsaturated
Co-occurrence
analysis
revealed
that
communities
exhibited
density,
Pseudomonas
playing
crucial
role
The
constructed
DOM–CBs–microbial
relationship
showed
indices,
such
as
O/C,
NOSC,
CHO
(%),
strongly
correlated
structure
could
directly
indicate
CBs.
characteristics
their
links
provide
rapid
accurate
method
monitor
contaminated
