Frontiers in Sustainable Food Systems,
Год журнала:
2024,
Номер
8
Опубликована: Ноя. 6, 2024
Optimum
soil
moisture
and
high
crop
residue
return
(RR)
can
increase
the
active
pool
of
organic
carbon
nitrogen,
thus
modulating
magnitude
greenhouse
gas
(GHG)
fluxes.
To
determine
effect
on
threshold
level
RR
for
wheat
production
system,
we
analyzed
relationship
between
GHG
fluxes
at
four
levels,
namely
0,
5,
10,
15
Mg
ha
−1
(R0,
R5,
R10,
R15)
under
two
content
(80%
FC
100%
FC)
three
levels
nutrient
management
(NS0:
no
nutrient;
NS1,
NS2=
3x
NS1).
Nutrient
input
(N
P)
in
NS1
balanced
C/nutrient
stoichiometry
to
achieve
30%
stabilization
C
(R5).
All
treatments
(cf.
R0)
were
found
significantly
reduce
N
2
O
emission
moderate
by
22–56%
across
due
enhanced
mineralization,
microbial
biomass
carbon,
immobilization.
However,
averaged
management,
a
linear
was
observed
with
increasing
moisture.
A
significant
decrease
CH
4
ca.
46%
most
compared
R0.
The
negatively
correlated
(p
=
<0.001)
stoichiometry.
Partial
least
square
(PLS)
regression
indicated
that
emissions
more
responsive
(values
>
0.8)
variables
(RR
rate,
nitrogen
(N)
moisture,
C:
N)
post-incubation
properties
(SMBC
NO
3
-N)
Alfisols.
This
study
demonstrated
mechanisms
responsible
effects
O,
fluxes,
mineralization
depend
shifting
N:
P.
Frontiers in Microbiology,
Год журнала:
2023,
Номер
14
Опубликована: Авг. 31, 2023
Nitrous
oxide
(N2O)
emissions
are
a
major
source
of
gaseous
nitrogen
loss,
causing
environmental
pollution.
The
low
organic
content
in
the
Loess
Plateau
region,
coupled
with
high
fertilizer
demand
maize,
further
exacerbates
these
N
losses.
fertilizers
play
primary
role
N2O
by
influencing
soil
denitrifying
bacteria,
however,
underlying
microbial
mechanisms
that
contribute
to
have
not
been
fully
explored.
Therefore,
research
aimed
gain
insights
into
intricate
relationships
between
fertilization,
denitrification,
emissions,
potential
denitrification
activity
(PDA),
and
maize
use
efficiency
(NUE)
semi-arid
regions.
Four
(N)
rates,
namely
N0,
N1,
N2,
N3
(representing
0,
100,
200,
300
kg
ha-1
yr.-1,
respectively)
were
applied
field.
cumulative
32
33%
higher
under
N2
37
39%
2020
2021,
respectively,
than
N0
treatment.
fertilization
rates
impacted
abundance,
composition,
network
communities
(nirS
nosZ)
bulk
rhizosphere
soil.
Additionally,
within
nirS
community,
genera
Cupriavidus
Rhodanobacter
associated
emissions.
Conversely,
nosZ
denitrifier,
Azospirillum,
Mesorhizobium,
Microvirga
reduced
Further
analysis
using
both
random
forest
structural
equation
model
(SEM)
revealed
specific
properties
(pH,
NO3--N,
SOC,
SWC,
DON),
presence
nirS-harboring
positively
PDA
activities,
exhibited
significant
association
activities
but
expressed
negative
effect
on
NUE.
However,
nosZ-harboring
showed
an
opposite
trend,
suggesting
different
effects
variables.
Our
findings
suggest
promoted
growth
increasing
abundance
denitrifiers
altering
composition
their
communities.
This
study
provides
new
among
microbiome,
productivity,
NUE,
Global Ecology and Conservation,
Год журнала:
2024,
Номер
51, С. e02899 - e02899
Опубликована: Март 12, 2024
Ecosystems
and
agroecosystems
strongly
influences
the
global
warming
by
nitrogen
oxide
(N2O)
emission.
In
a
recent
climate
change
scenario,
carbon
sequestration
is
obligatory
under
different
land-use
patterns.
However,
soil
elements
content
in
recover
process
of
degraded
environmental
conditions
on
Dingxi
Loess
Plateau
has
not
been
clearly
understood.
Thus,
this
current
study,
we
selected
four
representative
land
use
patterns,
including
picea
asperata
(PA),
which
based
forest
land;
medicago
sativa
(MS),
grassland;
abandoned
bare
(AL),
wheat
field
(WF),
farmland,
to
study
quality
indicators
N2O
greenhouse
gas
relationships
amongst
factors
flux.
Our
results
depicted
that
PA
MS
significantly
increased
organic
(SOC),
total
phosphorous
(TP),
gravimetric
water
(SWC),
bulk
density
(BD),
(TN),
ammonium
(NH4+-N),
microbial
biomass
(MBN)
whist
decreased
nitrate
(NO3--N)
pH
value
over
AL
pattern.
WF
pattern
showed
reduced
trend
above
mention
studied
parameters
than
AL.
Additionally,
compared
AL,
emissions,
with
reductions
24.91%
14.77%
2021
29.08%
17.53%
2022,
respectively.
The
increasing
53.18%
40.37%
Moreover,
variables
for
instance
aerial
temperature,
precipitation
had
significant
correlation
linear
regression
analysis,
NO3--N
temperature
positive
flux
while
NH4+-N,
BD,
SWC
were
negatively
correlated
Partial
Least
Squares
Path
Model
(PLS-PM)
indicates
moisture
was
dominant
factor
controlling
emissions
followed
nutrients
Accordingly,
context
vegetation
restoration
area,
proportion
grassland
should
be
increase
cope
future
scenario.
This
research
result
can
provide
theoretical
basis
technical
support
scientific
understanding
evaluation
emission
mechanisms
sink
functions
patterns
semi-arid
region
China.
