Frontiers in Microbiology,
Journal Year:
2024,
Volume and Issue:
15
Published: June 19, 2024
Dissimilatory
nitrate
reduction
to
ammonium
(DNRA)
is
an
important
pathway
in
freshwater
sediments.
Many
studies
have
focused
on
the
DNRA
process
various
natural
habitats.
However,
joint
operation
of
cascade
reservoirs
will
affect
physical
and
chemical
properties
sediments,
which
may
change
bacterial
community
pattern
surface
sediments
reservoirs.
Our
study
was
first
investigate
spatiotemporal
distribution
patterns
potential
rate,
nrfA
gene
abundances,
diversity
Lancang
River
The
results
slurry
incubation
experiments
combined
with
15
N
isotope
tracer
experiment
ascertained
that
rates
were
0.01–0.15
nmol-N
cm
−3
h
−1
,
qPCR
indicated
abundance
range
1.08
×
10
5
–2.51
6
copies
g
dry
weight.
High
throughput
sequencing
revealed
relative
Anaeromyxobacter
(4.52%
average),
Polyangium
(4.09%),
Archangium
(1.86%),
Geobacter
(1.34%),
Lacunisphaera
(1.32%)
high.
Pearson
RDA
correlation
analysis
exhibited
positively
correlated
altitude,
pH,
OC,
sand
concentration.
reservoir
age
rate.
deterministic
environmental
selection
plays
a
crucial
role
formation
community.
Network
displayed
dominant
genus
key
population
microbial
This
reveals
variation
activity
structure
largely
driven
by
construction
reservoirs,
provides
new
idea
for
further
understanding
characteristics
ecosystem.
Ecology and Evolution,
Journal Year:
2025,
Volume and Issue:
15(3)
Published: March 1, 2025
Soil
microorganisms
play
a
pivotal
role
in
the
biogeochemical
cycle
and
serve
as
crucial
indicators
of
ecological
restoration
terrestrial
ecosystems.
The
soil
microbial
community
is
regarded
participant
environmental
processes,
offering
both
positive
negative
feedback
to
diverse
media
within
ecosystem.
This
can
potential
indicator
monitoring
processes.
Consequently,
an
increasing
number
scholars
are
directing
their
research
towards
field
ecology
ecosystems
fragile
areas,
with
aim
elucidating
intricate
interactions
between
microbes
vegetation.
However,
implementation
microbiome
remains
experimental
stage
due
interference
extreme
events
complexity
governance
measures.
comprehensive
evaluation
existing
imperative.
review
aims
address
crises
currently
experienced
by
provide
overview
specific
practices
context
restoration.
We
also
incorporate
them
into
habitats
identify
urgent
issues
that
need
be
addressed
process
areas.
Remote Sensing,
Journal Year:
2023,
Volume and Issue:
15(18), P. 4465 - 4465
Published: Sept. 11, 2023
The
leaf
area
index
(LAI)
is
an
essential
biophysical
parameter
for
describing
the
vegetation
canopy
structure
and
predicting
its
growth
productivity.
Using
unmanned
aerial
vehicle
(UAV)
hyperspectral
imagery
to
accurately
estimate
LAI
of
great
significance
Spartina
alterniflora
(S.
alterniflora)
status
monitoring.
In
this
study,
UAV
S.
during
flourishing
period
were
acquired.
data
preprocessed
with
Savitzky–Golay
(SG)
smoothing,
first
derivative
(FD)
second
(SD)
spectral
transformations
then
carried
out.
Then,
using
band
combination
(BCI)
method,
characteristic
bands
related
extracted
from
image
obtained
UAV,
indices
(SIs)
constructed
through
bands.
Finally,
three
machine
learning
(ML)
regression
methods—optimized
support
vector
(OSVR),
optimized
random
forest
(ORFR),
extreme
gradient
boosting
(OXGBoostR)—were
used
establish
estimation
models.
results
showed
following:
(1)
ML
methods
predicted
LAI,
optimal
model
was
provided
by
ORFR
R2
0.85,
RMSE
0.19,
RPD
4.33;
(2)
FD
SIs
improved
accuracy,
value
improving
41.7%;
(3)
combinations
screened
BCI
method
mainly
concentrated
in
red
near-infrared
bands;
(4)
higher
distributed
on
seaward
side
study
area,
while
lower
located
at
junction
between
tidal
flat.
This
serves
as
both
theoretical
technological
research
a
solid
foundation
use
remote
sensing
technologies
supervisory
control
alterniflora.
Frontiers in Microbiology,
Journal Year:
2024,
Volume and Issue:
15
Published: July 12, 2024
Invasive
Spartina
alterniflora
(
S.
)
has
significant
impacts
on
sediment
biogeochemical
cycling
in
the
tidal
wetlands
of
estuaries
and
coasts.
However,
impact
exotic
invasion
greenhouse
gases
(GHGs)
production
dynamics
sediments
remain
limited.
Here,
we
investigated
physicochemical
properties,
GHGs
rates,
microbial
gene
abundances
a
native
Cyperus
malacensis
habitat
three
invasive
habitats
(6-,
10-,
14-year)
Minjiang
River
Estuary,
China.
The
methane
(CH
4
),
carbon
dioxide
(CO
2
nitrous
oxide
(N
O)
rates
varied
both
spatially
seasonally,
while
(bacterial
fungal
abundances)
organic
matter
(TOC
TN)
only
spatially.
were
also
characterized
by
higher
values
surface
(0–10
cm)
compared
to
subsurface
(10–20
seasonal
variations
with
summer
than
winter.
can
significantly
increase
CH
CO
matter,
p
<
0.05).
Temperature,
most
dominating
factor
controlling
spatio-temporal
rates.
Overall,
our
findings
highlighted
role
regulating
coastal
wetland
provided
fundamental
data
for
estimating
emissions
sequestration
complex
wetlands.
Frontiers in Earth Science,
Journal Year:
2024,
Volume and Issue:
12
Published: July 16, 2024
Nitrate
(NO
3
−
)
reduction
is
a
key
process
governing
the
nitrogen
(N)
dynamics
of
coastal
wetland
sediments.
Although
effects
environmental
factors
on
NO
mechanism
in
sediments
have
been
examined
various
studies,
spatial
variation
potential
processes
and
driving
geographical
these
not
widely
examined.
Here,
we
conducted
research
surface
sediment
samples
from
four
different
vegetation
types
at
six
sites
across
two
regions.
We
characterized
rates
(including
denitrification
(DF),
anammox
(ANA),
dissimilatory
nitrate
to
ammonium
(DNRA))
using
15
N
tracer
method.
Additionally,
assessed
abundances
functional
genes,
microbial
community
structure
high-throughput
sequencing,
metagenomic
sequencing.
In
sites,
contribution
ranges
DF,
ANA,
DNRA
were
38.43%–55.69%,
31.33%–45.65%,
5.26%–17.11%,
respectively,
was
mainly
driven
by
removal
via
gaseous
(DF+ANA).
Significant
differences
observed
bacterial
fungal
communities,
suggesting
that
distance
has
major
effect
structure.
Environmental
Functional
gene
significantly
related
processes,
physicochemical
properties
had
stronger
than
abundances.
Factors
showing
significant
regions
main
drivers
processes.
Overall,
our
study
showed
substrates
rather
abundance
genes
indicators
activities
wetlands.
Watershed Ecology and the Environment,
Journal Year:
2024,
Volume and Issue:
6, P. 54 - 62
Published: Jan. 1, 2024
The
invasive
species
Spartina
alterniflora
has
significantly
disrupted
the
ecological
stability
of
coastal
wetland
ecosystems.
Consequently,
its
control
become
an
important
aspect
conservation.
When
controlling
S.
alterniflora,
it
is
imperative
to
assess
impacts
methods.
In
this
study,
effects
different
methods,
i.e.
"mowing
+
flooding"
(MF)
and
plowing"
(MP),
on
soil
carbon
nitrogen
contents
in
wetlands
were
investigated
Yellow
River
Delta,
China.
results
showed
that
organic
carbon,
inorganic
total
MF
area
within
2
years
after
treatment
2.03–3.93
g/kg,
13.74–16.06
0.24–0.47
respectively,
which
36.33
%-199
%,
2.91
%-36.71
%
115.42
%-212.09
higher
than
those
CK
area,
respectively.
C/N
ratio
was
6.98–8.54,
5.42
%-40.30
lower
treatment.
MP
1.52–2.3
13.07–14.94
0.2–0.32
15.91
%-54.18
0.97
%-15.56
35.19
%-182.26
area.
14.72
%-46.79
Correlation
analysis
revealed
positively
correlated
with
water
content
electrical
conductivity,
negatively
sand
content.
affected
by
conductivity.
also
pH
clay
Overall,
greater
MP.
Future
studies
need
pay
attention
changes
tidal
hydrological
processes
more
accurately
overall
sink
capacity
intertidal
zone.
