The Science of The Total Environment,
Journal Year:
2022,
Volume and Issue:
861, P. 160569 - 160569
Published: Nov. 29, 2022
Grassland-shrubland
state
transition
causes
profound
effects
on
soil
nutrients
and
microorganisms,
yet
little
is
known
about
how
these
characteristics
are
influenced
by
rainfall
litter
changes
during
transition.
Here,
we
examined
water
(high
or
low
moisture
pulse)
(grass
shrub)
in
grassland-shrubland
mosaics
consisting
of
desert
grassland
(DG),
edge
(GE),
shrubland
(SE),
(SL)
sites.
The
results
showed
that
the
DG-GE-SE-SL
significantly
reduced
moisture,
total
carbon
(C),
nitrogen
(N),
phosphorus
(P),
microbial
biomass
carbon,
nitrogen,
revealing
evident
degradation
this
After
applying
litter,
respiration
(SMR)
activities
all
enzymes
were
promoted
to
varying
degrees
among
Specifically,
SMR
was
under
a
pulse
but
suppressed
high
along
from
DG
SL.
Two
C-acquisition
enzymes,
cellobiohydrolase
β-1,4-glucosidase,
became
increasingly
active
Another
enzyme
β-1,4-xylosidase
an
N-acquisition
leucine
aminopeptidase
strongest
preferences
for
pulses
These
indicated
shrub
encroachment
retained
certain
microbes
with
advanced
ability
acquire
C
N
dry
infertile
Although
P-acquisition
alkaline
phosphatase
decreasing
trend
SL,
similar
like
those
C-
N-
acquisition
it
not
sensitive
levels,
suggesting
affected
other
physicochemical
properties
rather
than
moisture.
joint
analysis
extracellular
played
more
important
role
determining
Future
research
dissecting
communities
warranted
better
understand
microbiological
mechanisms
behind
phenomena
process.
Critical Reviews in Environmental Science and Technology,
Journal Year:
2023,
Volume and Issue:
54(8), P. 676 - 697
Published: Oct. 6, 2023
The
addition
of
fresh
substrates
can
alter
the
decomposition
native
soil
organic
matter,
referred
to
as
priming
effect
(PE).
It
is
a
crucial
process
within
cycling
carbon
(C)
and
believed
be
regulated
by
nitrogen
(N)
input.
However,
direction
magnitude
this
N
on
PE
are
complex
due
involvement
various
factors
following
into
soil.
This
review
synthesizes
key
driving
responses
from
perspective
C-substrate
quantity
quality,
rates
forms,
properties
including
C
stability,
availability,
electrical
conductivity,
pH
buffer
capacity.
temporal
change
in
also
discussed.
In
studies
observing
suppressive
PE,
role
directly
suppressing
microbial
community
metabolism
(e.g.,
osmotic
stress
low
pH)
has
been
largely
ignored.
We
propose
application
multi-omics
techniques
examine
relationship
between
functional
traits
through
its
response
addition,
well
spatial
omics
imaging
exploring
connection
in-situ
distribution
addition.
Such
potentially
elucidate
how
elevated
atmospheric
CO2
may
affect
thus
stock
via
increasing
plant
input
regulating
nutrients
sources
for
uptake
under
inputs.
Geoderma,
Journal Year:
2023,
Volume and Issue:
433, P. 116444 - 116444
Published: March 28, 2023
Carbon
(C)
and
nutrient
inputs
regulate
the
soil
carbon
balance
by
affecting
microbial
growth
priming
effect
(PE).
However,
we
still
lack
a
comprehensive
understanding
of
mechanism
balance.
To
examine
regulatory
C
or
deficiency
on
turnover
in
forest
systems
different
ages,
collected
from
two
Robinia
pseudoacacia
stands
ages
conducted
an
incubation
experiment
using
13C-labelled
glucose
combined
with
nitrogen
and/or
phosphorus
(N
P)
addition.
We
determined
13C
partitioning
CO2
phospholipid
fatty
acids
(PLFAs).
Glucose
addition
caused
both
positive
negative
PEs
during
30-day
incubation.
The
PE
15-year-old
(15Y)
stand
changed
(0–15
days)
to
(15–30
days),
while
45-year-old
(45Y)
ranged
(0.5
(after
1
day).
Different
mechanisms
play
diverse
roles
various
decomposition
stages.
45Y
led
higher
cumulative
than
15Y
stand.
For
stands,
fungi
assimilated
greater
proportion
13C-glucose
plus
(CN
addition)
treatment
alone
treatment,
which
alleviated
fungal
N
requirements
decreased
PE.
phosphorous
(CP
had
no
significant
influence
CN
favoured
high-yielding
strategists
(Y-strategists)
glucose-derived
SOC
accumulation.
This
phenomenon
was
supported
relatively
high
use
efficiency
(CUE),
increased
net
In
contrast,
CP
conducive
resource-acquisition
(A-strategists),
organic
mineralization
evidenced
incorporation
into
PLFAs
gram-positive
bacteria
for
acquisition
under
Consequently,
13C-fungi
CUE,
gain.
Our
study
highlights
importance
fertilization
sequestration
plantations.
