Soil Biology and Biochemistry,
Journal Year:
2024,
Volume and Issue:
190, P. 109323 - 109323
Published: Jan. 19, 2024
Microbial
necromass
carbon
(C)
can
substantially
contribute
to
stabilized
soil
organic
matter
(SOM),
and
effective
management
of
this
C
may
help
mitigate
climate
change.
However,
factors
important
the
formation
microbial
are
only
partly
understood.
While
bioavailable
plant
inputs
induce
by
boosting
growth
use
efficiency,
other
traits,
such
as
those
related
secretion
systems
or
adhesion
motility,
also
be
relevant.
These
traits
independent
bioavailability
modulated
environmental
depth
site
age.
Such
links,
however,
have
hardly
been
studied.
Here,
we
used
replicated
plots
European
alder
(more
inputs)
Scots
pine
(less
investigate
links
among
inputs,
depth,
age,
community
composition,
in
SOM,
i.e.,
particulate
occluded
within
aggregates
(oPOM)
mineral-associated
(MAOM).
We
did
not
find
evidence
that
nor
were
major
drivers
formation.
Instead,
certain
taxa,
diversity
particular,
most
tightly
MAOM.
contributed
oPOM
(up
∼57%
stored
fraction),
a
pool
considered
largely
derive
from
biomolecules.
Combined,
MAOM
accounted
for
∼23%
bulk
contents.
Our
results
imply
C-focused
research
consider
constraints
on
composition
diversity,
pools
than
MAOM,
plant-derived
SOM.
Biogeosciences,
Journal Year:
2024,
Volume and Issue:
21(18), P. 4077 - 4098
Published: Sept. 19, 2024
Abstract.
Understanding
the
mechanisms
of
plant-derived
carbon
(C)
and
nitrogen
(N)
transformation
stabilization
in
soil
is
fundamental
for
predicting
capacity
to
mitigate
climate
change
support
other
functions.
The
decomposition
plant
residues
particulate
organic
matter
(POM)
contributes
formation
mineral-associated
(on
average
more
stable)
(MAOM)
soil.
MAOM
formed
from
binding
dissolved
(ex
vivo
pathway)
or
microbial
necromass
bioproducts
(in
minerals
metal
colloids.
Which
these
two
(SOM)
pathways
important
under
which
conditions
remains
an
open
question.
To
address
this
question,
we
propose
a
novel
diagnostic
model
describe
C
N
dynamics
as
function
POM
decomposition.
Focusing
on
relations
among
compartments
(i.e.,
modeling
phase
space)
rather
than
time
trajectories
allows
isolating
processes
underlying
stabilization.
Using
combination
with
database
36
studies
residue
were
tracked
into
MAOM,
found
that
predominantly
fueled
by
produced
microbes
decomposing
POM.
relevance
pathway
higher
clayey
soils
but
lower
C-rich
N-poor
added
residues.
Overall,
our
space
proved
be
sound
tool
mechanistic
investigation
supported
current
understanding
critical
role
both
mineral
soils.
Land Degradation and Development,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 28, 2025
ABSTRACT
Soil
organic
carbon
(SOC)
stabilization
is
vital
for
the
mitigation
of
global
climate
change
and
retention
soil
stocks.
The
Loess
Plateau
a
crucial
ecological
zone
in
China
even
worldwide
major
ecosystem
protection.
However,
Plateau,
there
are
knowledge
gaps
about
response
SOC
sources
to
different
transitions
jujube
economic
forests.
Therefore,
our
study
used
clean‐cultivated
orchards
as
control
(CK)
selected
five
main
transformation
models
abandoned
on
Lvliang
Mountain:
farmland
(AF),
replanted
with
Astragalus‐Bupleurum
(AB),
alfalfa
(AL),
Chinese
pine
(CP),
arborvitae
(PO).
properties,
physical
fractions
their
correlations
0‐
20‐cm
layer
at
each
sample
site
were
analyzed.
results
show
that
significantly
increased
by
affecting
plant‐
microbe‐derived
altering
its
components.
Different
treatments
have
varying
impacts
content.
lignin
phenol
(VSC)
content
soils
was
greater
than
CK
had
following
ranking:
CP
>
AL
PO
AF
AB
(
p
<
0.05).
also
total
amino
sugar
(TAS)
content,
microbial
residue
(MRC),
contribution
carbon.
Additionally,
it
promoted
accumulation
particulate
(POC)
mineral‐associated
(MAOC)
positively
impacted
stability.
Among
models,
greatest
impact
phenols,
sugars,
stability,
whereas
contributed
least
SOC.
this
provide
scientific
basis
assess
select
optimal
modes
commercial
