Global
climate
change,
characterized
by
nitrogen
(N)
deposition
and
precipitation
reduction,
can
disrupt
soil
microbial
stoichiometry
nutrient
availability,
subsequently
affecting
cycles.
However,
the
effects
of
N
reduction
on
status
in
temperate
forests
remain
poorly
understood.
This
study
addresses
this
gap
through
a
10-year
field
trial
conducted
Korean
pine
mixed
forest
northeastern
China
where
three
treatments
were
applied:
(PREC),
addition
(N50),
combination
with
(PREC-N50).
The
results
showed
that
N50
PREC
significantly
increased
carbon-to-phosphorus
(C/P)
nitrogen-to-phosphorus
(N/P)
imbalances,
thereby
exacerbating
P
limitation,
while
PREC-N50
did
not
alter
imbalances.
decreased
water
impairing
acquisition.
Both
influenced
enzyme
stoichiometry,
leading
to
increasing
ACP
production.
redundancy
analysis
indicated
status,
enzymatic
activity,
composition
contributed
variations
suggesting
adaption
microorganisms
limitation.
These
highlight
enhanced
boosting
shifts
elemental
composition,
production,
community
impacting
Abstract
Converting
crop
residues
into
biochar
and
subsequently
incorporating
it
soils
is
a
promising
strategy
to
improve
carbon
sequestration
in
agroecosystems.
However,
differences
the
potential
mechanisms
for
soil
organic
(SOC)
accumulation
between
its
feedstock
materials
remain
unclear.
This
study
performed
nine-year
field
experiment
involving
four
treatments
Mollisol:
mineral
fertilizers
alone
combined
with
maize
straw
or
biochar,
control
without
amendments.
The
main
objectives
of
this
were
assess
how
incorporation
influence
SOC
content,
chemical
composition,
microbial
necromass
(MNC)
community
characteristics.
Compared
alone,
significantly
(
P
<
0.05)
increased
while
(40.5%
increase)
had
more
pronounced
effects
than
(23.7%
increase).
Similarly,
both
MNC
content
boosted
biomass,
but
impact
did
biochar.
Additionally,
markedly
aromaticity
by
26.6%
0.05),
reduced
2.85%
>
0.05).
Fungi,
rather
bacteria,
played
crucial
role
increasing
through
their
inputs
under
incorporation.
Our
results
demonstrated
that
enhanced
primarily
entombing
effect
necromass,
biochemical
protection
from
recalcitrant
aromatic
carbon.
present
findings
provide
valuable
insight
practices
lead
maximize
sequestration.
Graphical
Journal of Geophysical Research Biogeosciences,
Год журнала:
2024,
Номер
129(6)
Опубликована: Июнь 1, 2024
Abstract
In
the
past
few
decades,
there
has
been
an
evolution
in
our
understanding
of
soil
organic
matter
(SOM)
dynamics
from
one
inherent
biochemical
recalcitrance
to
deriving
plant‐microbe‐mineral
interactions.
This
shift
driven,
part,
by
influential
conceptual
frameworks
which
put
forth
hypotheses
about
SOM
dynamics.
Here,
we
summarize
several
focal
and
derive
them
six
controls
related
formation,
(de)stabilization,
loss.
These
include:
(a)
physical
inaccessibility;
(b)
organo‐mineral
‐metal
stabilization;
(c)
biodegradability
plant
inputs;
(d)
abiotic
environmental
factors;
(e)
reactivity
diversity;
(f)
microbial
physiology
morphology.
We
then
review
empirical
evidence
for
these
controls,
their
model
representation,
outstanding
knowledge
gaps.
find
relatively
strong
support
representation
factors
but
disparities
between
data
models
diversity,
stabilization,
inputs,
particularly
with
respect
destabilization
latter
two
controls.
More
research
on
inaccessibility
morphology
is
needed
deepen
critical
improve
representation.
The
are
highly
interactive
also
present
some
inconsistencies
may
be
reconciled
considering
methodological
limitations
or
temporal
spatial
variation.
Future
must
simultaneously
refine
at
various
scales
within
a
hierarchical
structure,
while
incorporating
emerging
insights.
will
advance
ability
accurately
predict
Forests,
Год журнала:
2024,
Номер
15(6), С. 1040 - 1040
Опубликована: Июнь 16, 2024
Rational
application
of
N
fertilizer
is
essential
for
maintaining
the
long-term
productivity
Moso
bamboo
forests.
Microbial
activity
a
crucial
indicator
soil
quality.
Changes
in
nutrient
resources
due
to
addition
can
lead
microbial
limitations,
thereby
impeding
maintenance
Currently,
there
limited
research
on
effects
limitations
forest
soils.
To
examine
changes
extracellular
enzyme
and
soils
following
application,
we
conducted
an
experiment
northern
Guizhou.
The
findings
revealed
that
N3
treatment
(726
kg·N·hm−2·yr−1)
significantly
reduced
β-glucosidase
(BG)
by
27.61%
compared
control
group
(no
fertilization).
N1
(242
kg·N·hm−2·yr−1),
N2
(484
treatments
notably
increased
activities
leucine
aminopeptidase
(LAP)
N-acetyl-β-D-glucosidase
(NAG)
11.45%
15.79%.
Acid
phosphatase
(ACP)
remained
unaffected
fertilization.
decreased
C:Ne
C:Pe
ratios,
while
N:Pe
ratio
was
less
influenced
application.
Scatter
plots
vector
characteristics
stoichiometry
suggested
microorganisms
study
area
were
C
N,
length
angle,
indicating
alleviated
limitation
Redundancy
Analysis
(RDA)
demonstrated
biomass
phosphorus
(MBP)
most
critical
factor
affecting
stoichiometry.
Furthermore,
Random
Forest
Regression
analysis
identified
MBP
N:Pm
as
significant
factors
influencing
limitation,
respectively.
modulates
acquisition
strategy
altering
Formulating
strategies
based
requirements
more
beneficial
quality
sustainably
managing
Additionally,
our
offers
theoretical
reference
understanding
carbon
cycling
ecosystems
context
substantial
inputs.
Abstract
Agri-ecosystems
with
flooded
fields
are
pivotal
in
global
carbon
(C)
dynamics.
Although
extensive
research
has
focused
on
sequestration
paddy
fields,
year-round
waterlogged
pond
remain
underexplored.
This
study
investigates
dynamics
planted
Semen
Euryales
for
0,
24,
and
60
years,
examining
soil
organic
(SOC)
accumulation
shifts
its
composition.
The
results
revealed
a
progressive
increase
SOC,
driven
by
particulate
C
(POC)
mineral-associated
(MAOC).
SOC
increased
significantly
from
7.49
g
kg
–1
to
46.10
over
the
rising
12.0%
42.0%
(MAOC)
decreasing
87.8%
58.0%.
Lignin
phenols,
reflecting
plant-derived
carbon,
surged
11.0%
68.8%,
while
amino
sugars,
indicative
of
microbial
residues,
declined
89.0%
31.2%,
suggesting
reduced
activity
under
prolonged
anaerobic
conditions.
Total
phospholipid
fatty
acid
(PLFA)
decreased
40.6%
43.8%
after
24
respectively,
further
supporting
conclusion
that
conditions
limit
survival.
waterlogging
decomposition,
enhancing
POC,
particularly
such
as
residues.
especially
fungal
necromass,
played
significant
role
forming
MAOC.
That
is,
continuous
promoted
POC
also
contributed
MAOC
stabilization.
findings
provide
valuable
insights
into
sustainable
management
practices
contribute
climate
change
mitigation.
Graphical
Research Square (Research Square),
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 6, 2025
AbstractBackground
and
Aims:
Highly
weathered
tropical
forests
are
widely
recognized
as
nitrogen
(N)-rich
phosphorus
(P)-poor,
the
input
of
nutrienteffects
soil
carbon
(C)
cycling
storage
in
these
ecosystems.
In
topsoil,
short-term
nutrient
additionmay
not
only
effect
organic
C
(SOC)
pools
directly,
but
also
impact
conversion
process
indirectly
through
altering
microbial
use
efficiency
(CUE).
However,
effects
addition
on
accumulation
mechanisms
remain
unclear.
The
aim
this
study
was
to
clarify
SOC
responding
addition.
Methods:
This
conducted
a
one-year
N
P
additions
experiment
forest
Hainan,
China.
SOC,
fractions
(POC
MAOC),
biomass,
enzyme
activities,
physicochemical
properties
at
depths
0–10
cm,
10–20
cm
20–40
were
measured.
Results:
results
showed
that
increased
(8.91–20.03%),
POC
(6.65–24.90%),
MAOC
(8.74–19.89%)
topsoil
(0–10
cm),
whereas
no
significant
changes
occurred
subsoil
(20–40
cm).
Pearson’s
correlation
analysis
revealed
litter
biomass
CUE
significantly
positively
correlated
with
SOC.
partial
least
squares-path
model
influences
by
characteristics.
Conclusions:These
suggested
decreased
activities.
Such
information
could
provide
insight
understand
pool
forest.
