Agronomy,
Journal Year:
2023,
Volume and Issue:
13(12), P. 2909 - 2909
Published: Nov. 27, 2023
The
accumulation
of
nitrite
is
frequently
overlooked,
despite
the
fact
that
nitrification
most
essential
phase
entire
nitrogen
(N)
cycle
and
nitrifying
bacteria
play
a
significant
role
in
nitrification.
At
present,
effects
different
N
application
rates
on
soil
nitrite-oxidizing
(NOB)
abundance,
community
composition,
diversity,
its
main
influencing
factors
are
still
unclear.
In
this
study,
five
fertilizer
under
film
mulching
drip
irrigation
system
were
studied
semi-arid
area
Northeast
China.
treatments
0
kg
ha−1
(N0),
90
(N1),
150
(N2),
210
(N3),
270
(N4).
Fluorescent
quantitative
PCR
Illumina
Miseq
sequencing
used
to
analyze
abundance
structure
NOB
amounts
application.
results
showed
increase
was
strongly
accompanied
by
an
content
organic
matter
(SOM),
total
(TN),
nitrate
(NO3−-N),
ammonium
(NH4+-N),
while
pH
significantly
reduced
with
fertilization.
fertilization
increased
oxidoreductase
(NXR)
activity,
potential
(PNR),
oxidation
(PNO).
A
high
rate
heightened
Nitrospira-
Nitrobacter-like
NOB.
considerably
raised
Shannon
index
Nitrospira-like
amount
key
factor
affecting
NOB,
available
(AN)
had
dominant
influence
can
cause
acidification,
which
affects
diversity.
may
promote
mulched
fertigation
system.
findings
offered
crucial
scientific
foundation
for
further
investigation
into
how
respond
management
strategies
farmland
Applied and Environmental Microbiology,
Journal Year:
2021,
Volume and Issue:
87(21)
Published: Aug. 18, 2021
Revealing
the
response
of
soil
bacterial
community
to
external
environmental
disturbances
is
an
important
but
poorly
understood
topic
in
microbial
ecology.
In
this
study,
we
evaluated
effect
high
salinity
on
composition
and
key
biogeochemical
processes
salinized
agricultural
soils
(0.22
19.98
dS
m
−1
).
Frontiers in Microbiology,
Journal Year:
2024,
Volume and Issue:
15
Published: June 14, 2024
Salinization
damages
soil
system
health
and
influences
microbial
communities
structure
function.
The
response
of
functions
involved
in
the
nutrient
cycle
to
salinization
is
a
valuable
scientific
question.
However,
our
knowledge
metabolism
salinized
their
salinity
arid
desert
environments
inadequate.
Here,
we
applied
metagenomics
technology
investigate
carbon
(C),
nitrogen
(N),
phosphorus
(P),
sulfur
(S)
cycling
key
genes
salinity,
discuss
effects
edaphic
variables
on
functions.
We
found
that
fixation
dominated
cycle.
Nitrogen
fixation,
denitrification,
assimilatory
nitrate
reduction
(ANRA),
degradation
were
commonly
identified
as
most
abundant
processes
Organic
dissolution
absorption/transport
enriched
P
metabolic
functions,
while
was
by
sulfate
(ASR),
organic
transformation,
linkages
between
inorganic
transformation.
Increasing
inhibited
degradation,
anammox,
ANRA,
absorption
transport,
majority
metabolism.
some
pathway
showed
positive
salinization,
such
(facA,
pccA,
korAB),
denitrification
(narG,
nirK,
norBC,
nosZ),
ANRA
(nasA,
nirA),
(pstABCS,
phnCD,
ugpAB).
High
reduced
network
complexity
communities.
Even
so,
saline
community
presented
highly
cooperative
interactions.
water
content
had
significantly
correlations
with
C
genes.
SOC,
N,
contents
correlated
C,
P,
S
functional
AP,
NH4+,
NO3-
directly
promote
solubilization
mineralization,
uptake
ASR,
transformation
processes.
Soil
region
multiple
but
prompted
function
dissolution.
important
factor
driving
availability
also
played
roles
regulating
cycling.
