Global Change Biology,
Год журнала:
2024,
Номер
30(11)
Опубликована: Ноя. 1, 2024
ABSTRACT
Global
warming
is
generally
predicted
to
increase
aridity
in
drylands,
while
the
effects
of
changes
on
microbial
carbon
use
efficiency
(CUE)
and
its
linkage
soil
organic
(SOC)
storage
remain
unresolved,
limiting
accuracy
dynamic
predictions
under
changing
climates.
Here,
by
employing
large‐scale
sampling
from
50
sites
along
an
~6000
km
gradient
northern
China,
we
report
a
significant
decreasing
trend
CUE
(ranging
approximately
0.07
0.59
across
gradient)
with
increasing
aridity.
The
negative
effect
was
further
verified
independent
moisture
manipulation
experiment,
which
revealed
that
lower
levels
than
higher
levels.
Aridity‐induced
increases
physicochemical
protection
or
decreases
diversity
primarily
mediated
decrease
Moreover,
found
highly
positive
CUE–SOC
relationship,
incorporating
improved
explanatory
power
SOC
variations
gradient.
Our
findings
provide
empirical
evidence
for
aridity‐induced
reductions
over
broad
geographic
scale
highlight
may
be
crucial
mechanism
underlying
loss
suppressing
ability
microorganisms
sequester
carbon.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Янв. 8, 2024
Abstract
Increasing
soil
organic
carbon
(SOC)
in
croplands
by
switching
from
conventional
to
conservation
management
may
be
hampered
stimulated
microbial
decomposition
under
warming.
Here,
we
test
the
interactive
effects
of
agricultural
and
warming
on
SOC
persistence
underlying
mechanisms
a
decade-long
controlled
experiment
wheat-maize
cropping
system.
Warming
increased
content
accelerated
fungal
community
temporal
turnover
agriculture
(no
tillage,
chopped
crop
residue),
but
not
(annual
residue
removed).
Microbial
use
efficiency
(CUE)
growth
linearly
over
time,
with
stronger
positive
after
5
years
agriculture.
According
structural
equation
models,
these
increases
arose
greater
inputs
crops,
which
indirectly
CUE
via
changes
communities.
As
result,
necromass
28
53%,
emerging
as
strongest
predictor
content.
Collectively,
our
results
demonstrate
how
climatic
factors
can
interact
alter
composition,
physiology
functions
and,
turn,
formation
accrual
croplands.
Proceedings of the National Academy of Sciences,
Год журнала:
2023,
Номер
120(32)
Опубликована: Июль 31, 2023
The
paucity
of
investigations
carbon
(C)
dynamics
through
the
soil
profile
with
warming
makes
it
challenging
to
evaluate
terrestrial
C
feedback
climate
change.
Soil
microbes
are
important
engines
driving
biogeochemical
cycles;
their
use
efficiency
(CUE),
defined
as
proportion
metabolized
organic
allocated
microbial
biomass,
is
a
key
regulator
controlling
fate
C.
It
has
been
theorized
that
CUE
should
decline
warming;
however,
empirical
evidence
for
this
response
scarce,
and
data
from
deeper
soils
particularly
scarce.
Here,
based
on
samples
whole-soil-profile
experiment
(0
1
m,
+4
°C)
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Сен. 13, 2024
Microbial
carbon
use
efficiency
(CUE)
affects
the
fate
and
storage
of
in
terrestrial
ecosystems,
but
its
global
importance
remains
uncertain.
Accurately
modeling
predicting
CUE
on
a
scale
is
challenging
due
to
inconsistencies
measurement
techniques
complex
interactions
climatic,
edaphic,
biological
factors
across
scales.
The
link
between
microbial
soil
organic
relies
stabilization
necromass
within
aggregates
or
association
with
minerals,
necessitating
an
integration
processes
approaches.
In
this
perspective,
we
propose
comprehensive
framework
that
integrates
diverse
data
sources,
ranging
from
genomic
information
traditional
assessments,
refine
cycle
models
by
incorporating
variations
CUE,
thereby
enhancing
our
understanding
contribution
cycling.
Global Change Biology,
Год журнала:
2024,
Номер
30(6)
Опубликована: Июнь 1, 2024
Abstract
Microbial
necromass
carbon
(MNC)
accounts
for
a
large
fraction
of
soil
organic
(SOC)
in
terrestrial
ecosystems.
Yet
our
understanding
the
fate
this
pool
under
long‐term
warming
is
uncertain.
Here,
we
show
that
14
years
(+4°C)
temperate
forest
resulted
reduction
MNC
by
11%
(0–10
cm)
and
33%
(10–20
cm).
Warming
caused
decrease
content
due
to
decline
microbial
biomass
reduced
use
efficiency.
This
was
primarily
warming‐induced
limitations
available
phosphorus,
which,
turn,
constrained
production
biomass.
Conversely,
increased
activity
extracellular
enzymes,
specifically
N
‐acetylglucosaminidase
leucine
aminopeptidase,
which
accelerated
decomposition
MNC.
These
findings
collectively
demonstrate
decoupling
formation
underlie
observed
loss
climate
warming,
could
affect
SOC
ecosystems
more
widespread.
