Frontiers in Microbiology,
Год журнала:
2024,
Номер
15
Опубликована: Июнь 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.
Global Change Biology,
Год журнала:
2024,
Номер
30(3)
Опубликована: Март 1, 2024
Abstract
Denitrification,
anaerobic
ammonium
oxidation
(anammox),
and
dissimilatory
nitrate
reduction
to
(DNRA)
are
three
competing
processes
of
microbial
that
determine
the
degree
ecosystem
nitrogen
(N)
loss
versus
recycling.
However,
global
patterns
drivers
relative
contributions
these
N
cycling
soil
or
sediment
remain
unknown,
limiting
our
understanding
balance
management.
Here,
we
compiled
a
dataset
1570
observations
from
wide
range
terrestrial
aquatic
ecosystems.
We
found
denitrification
contributed
up
66.1%
total
globally,
being
significantly
greater
in
estuarine
coastal
Anammox
DNRA
could
account
for
12.7%
21.2%
reduction,
respectively.
The
contribution
increased
with
longitude,
while
anammox
decreased.
local
environmental
factors
controlling
included
concentrations
organic
carbon,
ammonium,
nitrate,
ferrous
iron.
Our
results
underline
dominant
role
over
transformation,
which
is
crucial
improving
current
cycle
model
achieving
sustainable
Frontiers in Marine Science,
Год журнала:
2023,
Номер
10
Опубликована: Май 8, 2023
Coastal
wetlands
are
an
important
hotspot
for
nutrient
cycling
and
transport
from
the
land
to
ocean.
Silicon
(Si)
as
a
vital
biogenic
element
affects
plant
growth
health
of
coastal
ecosystems.
The
understanding
key
factors
processes
controlling
dissolved
silicate
(DSi)
exchange
between
water
has
been
limited
due
lack
measured
data.
We
carried
out
intensive
investigations
time-series
DSi
concentrations
porewater
across
Sediment-Water
Interface
(SWI)
along
tidal
creek
with
mangrove-salt
marsh
gradient
during
neap
spring
tides
in
2020.
Seasonal
observations
surface
Zhangjiang
Estuary
(Fujian
Province,
China)
were
conducted
2017
results
showed
that
there
was
net
export
mangroves
rates
2.11
2.40
mmol
m
-2
d
-1
respectively,
suggesting
served
source
DSi.
However,
salt
marshes
had
import
one
or
two
orders
magnitude
lower
than
mangroves.
wetland‐estuarine
continuum
largely
controlled
by
exchange,
groundwater
geochemistry
(pH,
temperature)
root
uptake.
Groundwater
larger
ratios
:
DIN
(dissolved
inorganic
nitrogen)
(2.5
±
0.6)
DRP
reactive
phosphorus)
(1257
35)
compared
water.
would
modify
stoichiometry
mitigate
effects
reduced
river
flux
caused
damming
on
ecosystem.
This
study
provides
new
insights
into
wetland
Si
sustaining
ecosystem
health.
Global Biogeochemical Cycles,
Год журнала:
2024,
Номер
38(6)
Опубликована: Май 30, 2024
Abstract
Plant
invasion
and
land
reclamation
have
drastically
transformed
the
landscape
of
coastal
wetlands
globally,
but
their
resulting
effects
on
soil
organic
nitrogen
(SON)
mineralization
nitrous
oxide
(N
2
O)
production
remain
unclear.
In
this
study,
we
examined
21
across
southern
China
that
undergone
habitat
transformation
from
native
mudflats
(MFs)
to
Spartina
alterniflora
marshes
(SAs),
subsequently
earthen
aquaculture
ponds
(APs).
We
determined
SON
net
rate
presence
pertinent
enzyme‐encoding
genes,
namely
chiA
,
pepA
pepN
.
The
increased
by
46.7%
following
conversion
MFs
SAs
decreased
33.1%
in
response
APs.
Nevertheless,
there
was
no
significant
difference
estimated
efficiency
microbes
among
types.
results
structural
equation
modeling
showed
N‐mineralization
gene
abundance
played
a
major
role
regulating
mineralization.
Although
less
than
20%
be
labile/semi‐labile,
important
sustaining
N
O
production,
with
5.8%
mineralized
being
fed
into
production.
Overall,
our
findings
S.
both
content
rate,
which
would
turn
promote
further
proliferation
exotic
plant
along
coast.
APs
partially
mitigated
positive
turnover.
