Global Change Biology,
Journal Year:
2024,
Volume and Issue:
30(6)
Published: June 1, 2024
Priming
of
soil
organic
matter
(SOM)
decomposition
by
microorganisms
is
a
key
phenomenon
global
carbon
(C)
cycling.
Soil
pH
main
factor
defining
priming
effects
(PEs)
because
it
(i)
controls
microbial
community
composition
and
activities,
including
enzyme
(ii)
defines
SOM
stabilization
destabilization
mechanisms,
(iii)
regulates
intensities
many
biogeochemical
processes.
In
this
critical
review,
we
focus
on
prerequisites
mechanisms
PE
depending
assess
the
change
consequences
for
PE.
The
highest
PEs
were
common
in
soils
with
between
5.5
7.5,
whereas
low
molecular
weight
compounds
triggered
mainly
slightly
acidic
soils.
Positive
up
to
20
times
before
C
input
at
around
6.5.
Negative
below
4.5
or
above
7
reflecting
suboptimal
environment
specific
high
pH.
Short-term
acidification
(in
rhizosphere,
after
fertilizer
application)
affects
by:
mineral-SOM
complexation,
oxidation
iron
reduction,
enzymatic
depolymerization,
pH-dependent
changes
nutrient
availability.
Biological
processes
metabolism
shift
over
short-term,
long-term
adaptations
slow
are
common.
nitrogen
fertilization
induced
land
use
intensification
strongly
decrease
thus
boost
Concluding,
one
strongest
but
now
disregarded
factors
PE,
through
short-term
metabolic
adaptation
groups
communities.
Global Change Biology,
Journal Year:
2023,
Volume and Issue:
29(14), P. 4081 - 4093
Published: April 25, 2023
It
is
widely
accepted
that
phosphorus
(P)
limits
microbial
metabolic
processes
and
thus
soil
organic
carbon
(SOC)
decomposition
in
tropical
forests.
Global
change
factors
like
elevated
atmospheric
nitrogen
(N)
deposition
can
enhance
P
limitation,
raising
concerns
about
the
fate
of
SOC.
However,
how
N
affects
priming
effect
(PE)
(i.e.,
fresh
C
inputs
induced
changes
SOC
decomposition)
forests
remains
unclear.
We
incubated
soils
exposed
to
9
years
experimental
a
subtropical
evergreen
broadleaved
forest
with
two
types
13
C-labeled
substrates
contrasting
bioavailability
(glucose
cellulose)
without
amendments.
found
decreased
total
biomass
P,
suggesting
enhanced
limitation.
In
unamended
soils,
significantly
inhibited
PE.
contrast,
adding
increased
PE
under
by
larger
extent
for
cellulose
(PEcellu
)
than
glucose
(PEglu
).
Relative
or
solely,
alleviated
suppression
C-acquiring
enzymes
deposition,
whereas
attenuated
stimulation
acid
phosphatase
(AP)
deposition.
Across
treatments,
PEglu
as
enzyme
activity
increased,
PEcellu
AP
decreased.
This
suggests
inhibits
through
varying
mechanisms
depending
on
substrate
bioavailability;
is,
limitation
regulates
affecting
growth
investment
acquisition,
acquisition.
These
findings
provide
new
insights
impacted
loading,
expected
quality
affect
long-term
regulation
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Feb. 8, 2024
Abstract
Unravelling
biosphere
feedback
mechanisms
is
crucial
for
predicting
the
impacts
of
global
warming.
Soil
priming,
an
effect
fresh
plant-derived
carbon
(C)
on
native
soil
organic
(SOC)
decomposition,
a
key
mechanism
that
could
release
large
amounts
C
into
atmosphere.
However,
climate
warming
priming
remain
elusive.
Here,
we
show
experimental
accelerates
by
12.7%
in
temperate
grassland.
Warming
alters
bacterial
communities,
with
38%
unique
active
phylotypes
detected
under
The
functional
genes
essential
decomposition
are
also
stimulated,
which
be
linked
to
effects.
We
incorporate
lab-derived
information
ecosystem
model
showing
parameter
uncertainty
can
reduced
32–37%.
Model
simulations
from
2010
2016
indicate
increase
warming,
9.1%
rise
priming-induced
CO
2
emissions.
If
our
findings
generalized
other
ecosystems
over
extended
period
time,
play
important
role
terrestrial
cycle
feedbacks
and
change.
