Soil Science Society of America Journal,
Год журнала:
2025,
Номер
89(3)
Опубликована: Май 1, 2025
Abstract
Role
of
varying
C:N
ratios
biochar
to
enhance
soil
health
and
impacts
across
types
remain
inadequately
understood.
Therefore,
this
study
aimed
elucidate
the
mechanisms
change
in
organic
carbon
(SOC)
fractions
greenhouse
gas
(GHG)
emissions
under
nitrogen‐enriched
(NB)
application
sandy
loamy
soil.
A
control
(CK;
without
biochar)
four
types,
including
one
pristine
(PB)
three
NB
(NB1,
NB2,
NB3),
were
applied
at
two
rates
(20
t
ha
−1
[L1]
40
[L2]).
Biochar
levels
significantly
influenced
CH₄
CO₂
emissions.
effectively
reduced
while
increased
both
types.
enhanced
SOC
pools,
which
is
primarily
attributed
mineral‐associated
particulate
soils.
β‐glucosidase,
cellobiohydrolase,
β‐xylosidase
by
NB,
particularly
a
higher
rate
(L2)
compared
CK,
with
more
pronounced
increases
Structural
equation
modeling
showed
that
SOC.
The
results
provide
valuable
insights
for
guiding
applications
reducing
improving
fertility,
potential
benefits
diverse
agroecosystems
farming
communities
worldwide.
Abstract
Biochar
application
and
conservation
tillage
are
significant
for
long-term
organic
carbon
(OC)
sequestration
in
soil
enhancing
crop
yields,
however,
their
effects
on
native
(native
SOC)
without
biochar
situ
remain
largely
unknown.
Here,
an
11-year
field
experiment
was
carried
out
to
examine
different
rates
(0,
30,
60,
90
Mg
ha
−1
)
SOC
pools
labile
pool
I
II,
recalcitrant
microbial
activities
calcareous
across
entire
winter
wheat–maize
rotation.
The
proportions
of
C
3
4
-derived
mineralization
were
quantified
using
basal
respiration
(SBR)
combined
with
13
natural
isotope
abundance
measurements.
results
showed
that
39–51%
the
remained
top
30
cm
after
11
years.
significantly
increased
contents
but
decreased
proportion
[native
dissolved
(DOC),
biomass
(MBC)].
tended
increase
indicators
associated
degradation,
such
as
SBR,
fluorescein
diacetate
hydrolysis
activity,
metabolic
quotient
(
q
CO
2
).
Meanwhile,
higher
(B60
B90)
SBR
enhanced
mineralization.
effect
rate
content
fractions
occurred
0–15
layer,
there
no
differences
at
15–30
cm.
Soil
depth
also
II
.
In
conclusion,
accumulation
by
SOC,
collectively
influenced
seasonal
turnover
fractions,
which
has
important
implications
agricultural
sequestration.
Graphical
Abstract
Saltmarshes
are
suffering
from
severe
degradation
due
to
anthropogenic
activities,
leading
the
loss
of
blue
carbon
and
greenhouse
gas
(GHG)
emissions.
Given
significant
potential
biochar
in
mitigating
climate
change,
adding
saltmarshes
would
alleviate
this
situation.
This
study
investigated
effects
different
(made
Spartina
alterniflora
,
corn
straw,
Laminaria
japonica
)
their
aged
on
fraction
contents,
GHG
emissions,
microbial
community
structure
saltmarsh
soils
with
allochthonous
organic
matter
(
Enteromorpha
prolifera
addition.
After
60
days
incubation,
total
(TOC)
global
warming
(GWP)
biochar-amended
were
reduced
by
67.29–124.33%
4.91–123.24%,
respectively
p
<
0.05).
Biochar
proportion
labile
(dissolved
(DOC)
biomass
(MBC))
61.92–86.15%
In
addition,
relative
abundance
specific
functional
bacteria
(inc.
cellulolysis,
aromatic
compound
degradation,
xylanolysis)
involved
decomposition
20.02–37.82%
These
results
suggest
that
even
presence
high
levels
liable
matter,
application
has
a
sustained
effect
promoting
accumulation
reducing
is
regulated
decrease
associated
metabolism.
Therefore,
situ
restoring
sink
function
proposed
for
practical
engineering
future.
Graphical
