Elementa Science of the Anthropocene,
Год журнала:
2021,
Номер
9(1)
Опубликована: Янв. 1, 2021
Agricultural
practices
such
as
fertilization
considerably
influence
soil
greenhouse
gas
fluxes.
However,
the
effects
of
on
gases
fluxes
remain
unclear
in
tea
when
nitrogen
is
low.
In
present
study,
CO2
and
CH4
under
various
treatments
were
investigated
during
a
50-day
period.
The
experiment
consisted
five
treatments:
no
fertilizer
(CK),
single
(urea,
N),
oilseed
rape
cake
(R),
+
(2:1,
NR1),
(1:2,
NR2).
proportion
NR1
NR2
was
determined
by
content
fertilizer.
results
revealed
that
application
had
significant
effect
flux.
addition
significantly
increased
emissions
through
enhanced
microbial
biomass
carbon
(MBC).
Additionally,
directly
proportional
to
amount
(C)
All
minor
sinks
for
except
treatment
NR1.
Specifically,
cumulative
higher
than
rest
three
treatments,
which
implies
urea
reduced
capability
oxidation
soil.
Structural
equation
models
indicated
flux
positively
correlated
with
dissolved
organic
carbon,
MBC
pH,
while
mineral
main
factor
affecting
Overall,
promoted
C
sequestration
but
inevitably
emissions.
Environmental Science & Technology,
Год журнала:
2023,
Номер
57(7), С. 2970 - 2980
Опубликована: Янв. 31, 2023
Paddy
fields
are
one
of
the
most
important
sources
nitrous
oxide
(N2O),
but
biogeochemical
N2O
production
mechanisms
in
soil
profile
remain
unclear.
Our
study
used
incubation,
dual-isotope
(15N-18O)
labeling
methods,
and
molecular
techniques
to
elucidate
characteristics
(0-60
cm)
during
summer
fallow,
rice
cropping,
winter
fallow
periods.
The
results
pointed
out
that
biotic
processes
dominated
(72.2-100%)
from
tillage
layer
accounted
for
91.0-98.5%
total
profile.
Heterotrophic
denitrification
(HD)
was
main
process
generating
N2O,
contributing
between
53.4
96.6%,
remainder
being
due
ammonia
oxidation
pathways,
which
further
confirmed
by
metagenomics
quantitative
polymerase
chain
reaction
(qPCR)
assays.
Nitrifier
(ND)
an
source,
0-46.6%
production,
showed
similar
trends
with
emissions.
Among
physicochemical
biological
factors,
ammonium
content
ratio
organic
matter
nitrate
were
driving
factors
affecting
contribution
ratios
pathways
HD
pathway,
respectively.
Moisture
pH
affect
norC-carrying
Spirochetes
thus
rate.
These
findings
confirm
importance
ND
help
impact
anthropogenic
activities,
including
tillage,
fertilization,
irrigation,
on
production.
Physiological
and
ecological
studies
have
provided
evidence
for
pH-driven
niche
specialization
of
ammonia
oxidizers
in
terrestrial
ecosystems.
However,
the
functional
stability
following
pH
change
has
not
been
investigated,
despite
its
importance
understanding
maintenance
ecosystem
processes
environmental
perturbation.
This
is
particularly
true
after
anthropogenic
perturbation,
such
as
conversion
tropical
forest
to
oil
palm
plantations.
study
demonstrated
a
great
impact
land-use
on
nitrification,
which
linked
changes
soil
due
common
agricultural
practices
(intensive
fertilization).
In
addition,
different
communities
were
differently
affected
by
short-term
perturbations,
with
implications
future
conversions
but
also
increased
knowledge
associated
global
nitrous
oxide
emissions
current
climate
concerns.
