Global Biogeochemical Cycles,
Год журнала:
2024,
Номер
38(7)
Опубликована: Июнь 30, 2024
Abstract
Organic
matter
accumulation
in
soil
is
understood
as
the
result
of
dynamics
between
mineral‐associated
(more
decomposed,
microbial
derived)
organic
and
free
particulate
(less
plant
matter.
However,
from
regional
to
global
scales,
patterns
drivers
behind
main
carbon
(SOC)
fractions
are
not
well
remain
poorly
linked
pedogenetic
variation
across
types.
Here,
we
separated
SOC
associated
with
silt‐
clay‐sized
particles
(S
+
C),
stable
aggregates
(>63
μm,
SA)
(POM)
a
diverse
range
grassland
topsoils
sampled
along
geoclimatic
gradient.
The
relative
contribution
two
C
&
differed
significantly
gradient,
while
POM
was
never
dominant
fraction.
Stable
μm)
emerged
major
fraction
carbon‐rich
soils.
degree
decomposition
consistently
that
S
did
change
investigated
In
contrast,
less
microbially
decomposed
soils
than
carbon‐poor
amount
positively
correlated
pedogenic
oxide
contents
texture,
whereas
negatively
temperature.
We
present
conceptual
summary
our
findings,
which
integrates
role
other
illustrates
their
changing
importance
(soil‐)environmental
gradients.
Journal of Plant Nutrition and Soil Science,
Год журнала:
2022,
Номер
185(3), С. 427 - 440
Опубликована: Апрель 28, 2022
Abstract
Background
Soil
organic
carbon
(SOC)
storage
is
highly
variable
across
sites
and
primarily
depends
on
site
properties
land
use.
It
therefore
difficult
for
farmers
to
evaluate
the
actual
SOC
status
of
a
site.
To
aid
interpretation
measured
contents,
easy‐to‐use
frameworks
assessment
contents
are
needed.
Aims
The
aim
this
study
was
derive
site‐specific
benchmarks
German
mineral
soils
under
agricultural
use
based
dataset
first
Agricultural
Inventory.
Methods
stratified
into
33
strata
by
use,
soil
texture,
C/N
ratio
mean
annual
precipitation.
Lower
upper
were
calculated
all
(0.125
0.875
quantile).
Results
benchmark
value
ranges
lower
cropland
(6.8–48.9
g
kg
–1
)
than
grassland
(14.1–76.6
),
increased
with
rising
clay
content
Sandy
wide
high
due
their
heathland
or
peatland
history
divided
separate
strata.
number
only
decreased
slightly.
Around
15–20
required
as
minimum
quantify
one
stratum.
Conclusions
presented
framework
easy
requiring
four
readily
available
stratification
factors
perform
comparative
classification
contents.
allows
extension
services
compare
where
fall
within
expected
range
site,
can
thus
help
develop
an
initial
evaluation
regard
soil‐specific
differences.
Abstract
Biochemical
properties
of
soil
organic
matter
(SOM)
are
fundamental
for
fertility
and
health.
However,
it
is
unclear
how
fertilization
regime
influences
the
biochemical
compositions
oxidation
states
SOM
physical
fractions.
In
this
study,
issue
was
studied
under
four
32-year
amendment
regimes:
unfertilized
control,
urea
(N),
N
+
calcium
dihydrogen
phosphate
potassium
chloride
(NPK),
NPK
plus
manure
(NPKM).
Three
fractions:
coarse
particulate
(>
250
μm,
cPOM),
fine
(53–250
fPOM)
mineral-associated
OM
(<
53
MAOM)
were
separated
measured
by
pyrolysis
gas
chromatography/mass
spectrometry
(Py-GC/MS).
Compared
with
background
in
1986,
increased
10.6%,
14.2%,
23%
52%
N,
NPK,
NPKM,
respectively.
The
red
here
had
not
reached
carbon
saturation,
because
low
conversion
efficiency
(6.8%)
from
input-carbon
to
(SOC).
Physical
size
but
type
primarily
regulated
molecular
composition,
relative
selective
retention
aromatics
lignin
both
cPOM
fPOM,
whereas
N-containing
compounds
(particularly
amino-N)
enriched
MAOM
due
their
high
abilities
adsorb
minerals.
C
state
also
mainly
dependent
on
size,
highest
value
fPOM.
sources
its
fractions,
dominated
microbial-derived
(60–90%),
independent
fertilization.
conclusion,
arrangement
(proxy
microbial
decomposition
degree)
played
a
more
important
role
regulating
features
than
initial
quality
various
amendments.
Graphical
Journal of Geophysical Research Biogeosciences,
Год журнала:
2023,
Номер
128(7)
Опубликована: Июль 1, 2023
Abstract
Mineral
binding
of
organic
carbon
(OC)
is
one
the
key
mechanisms
promoting
soil
(SOC)
persistence,
which
vital
for
long‐term
sequestration
atmospheric
dioxide
into
soils.
However,
relative
importance
two
main
types
minerals
‐
metal
oxides
and
silicate
clay—in
SOC
protection
remains
unclear,
hampering
our
ability
to
predict
protect
this
important
pool
persistent
SOC.
Here,
we
analyzed
OC
bound
(OC
)
versus
clay
in
soils
from
contrasting
environments
(i.e.,
wetlands
uplands)
using
sequential
dissolution
by
dithionite
hydrofluoric
acid.
We
found
that
%
was
higher
than
both
uplands,
indicating
dominance
protection.
The
sum
constituted
a
fraction
suggesting
an
underappreciated
role
mineral
(in
particular,
oxide)
wetland
preservation.
Furthermore,
lignin
phenol
analysis
tandem,
∼23%
phenols
were
additionally
released
after
removal
clay,
providing
potential
means
assess
“hidden”
matrices.
Given
wide
use
as
tracers
terrestrial
plant‐derived
OC,
results
suggest
contribution
or
sedimentary
stocks
mineral‐protected
deserves
reassessment.
These
findings
highlight
differential
various
its
components
environments,
warrants
better
recognition
understanding
distribution
dynamics
Frontiers in Plant Science,
Год журнала:
2023,
Номер
14
Опубликована: Окт. 12, 2023
The
variation
of
organic
carbon
content
in
spoil
heaps
is
closely
related
to
improving
soil
structure,
maintaining
fertility,
and
regulating
cycling
balance.
Analyzing
the
driving
factors
during
natural
vegetation
restoration
process
great
significance
for
promoting
accumulation
heaps.we
selected
with
same
number
years
research
variations
components
under
different
types
(grassland:
GL,
shrubland:
SL,
secondary
forest:
SF)
compared
results
those
on
bare
land
(BL).Our
showed
that
type
depth
significantly
affect
components.
There
was
no
difference
between
SF
but
both
were
considerably
superior
GL
BL
(p<0.05),
particulate
(POC)
light
fraction
(LFOC)
contents
SL
highest.
A
significant
positive
linear
correlation
existed
SOC
active
Pearson's
redundancy
analysis
available
potassium
(AK)
total
nitrogen
(TN)
gravel
(GC)
impacted
carbon.
When
present,
TN,
phosphorus
(TP),
Fine
root
biomass
(FRB)
Structural
equation
modelling
(SEM)
shows
AK
moisture
(SMC)
directly
composition
BL,
there
cover,
fine
had
largest
effect
SEM.
Soil
bulk
density
(BD)
has
a
negative
impact
carbon,
especially
presence
vegetation.These
findings
suggest
can
increase
content,
FRB,
AK,
TN
play
important
roles
enhancing
Supplementation
should
be
considered
stage,
shrubs
nitrogen-fixing
functions
well-developed
roots
are
more
beneficial
Global Biogeochemical Cycles,
Год журнала:
2024,
Номер
38(7)
Опубликована: Июнь 30, 2024
Abstract
Organic
matter
accumulation
in
soil
is
understood
as
the
result
of
dynamics
between
mineral‐associated
(more
decomposed,
microbial
derived)
organic
and
free
particulate
(less
plant
matter.
However,
from
regional
to
global
scales,
patterns
drivers
behind
main
carbon
(SOC)
fractions
are
not
well
remain
poorly
linked
pedogenetic
variation
across
types.
Here,
we
separated
SOC
associated
with
silt‐
clay‐sized
particles
(S
+
C),
stable
aggregates
(>63
μm,
SA)
(POM)
a
diverse
range
grassland
topsoils
sampled
along
geoclimatic
gradient.
The
relative
contribution
two
C
&
differed
significantly
gradient,
while
POM
was
never
dominant
fraction.
Stable
μm)
emerged
major
fraction
carbon‐rich
soils.
degree
decomposition
consistently
that
S
did
change
investigated
In
contrast,
less
microbially
decomposed
soils
than
carbon‐poor
amount
positively
correlated
pedogenic
oxide
contents
texture,
whereas
negatively
temperature.
We
present
conceptual
summary
our
findings,
which
integrates
role
other
illustrates
their
changing
importance
(soil‐)environmental
gradients.
