Frontiers in Microbiology,
Journal Year:
2024,
Volume and Issue:
15
Published: Oct. 10, 2024
Grazing
has
been
shown
to
impact
the
soil
environment
and
microbial
necromass
carbon
(MNC),
which
in
turn
regulates
organic
(SOC).
However,
sequestration
potential
of
fungi
bacteria
under
different
stocking
rates
remains
unclear,
limiting
our
understanding
grazing
management.
In
2004,
we
established
experiments
desert
steppe
northern
China
with
four
rates.
Our
findings
indicate
that
MNC
decreased
moderate
heavy
grazing,
while
light
did
not
significantly
differ
from
no
grazing.
Notably,
reduction
fungal
carbon,
rather
than
bacterial
was
primarily
responsible
for
contribution
SOC.
This
difference
is
attributed
varying
effects
sheep
on
community
characteristics,
including
richness,
diversity,
composition.
Thus,
accurately
predict
dynamics
grassland
ecosystems,
it
essential
consider
ecological
impacts
communities
may
vary
management
practices.
Research Square (Research Square),
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 27, 2025
Abstract
Background
and
aims
Nitrogen
(N)
addition
can
substantially
affect
soil
carbon
cycling
in
agroecosystems.
Microbial
necromass
(MNC)
is
widely
recognized
as
a
key
contributor
to
organic
C
(SOC)
fractions.
However,
the
mechanisms
underlying
responses
of
MNC
SOC
fractions
N
fertilization
paddy
soils
remain
unclear.
Methods
A
field
experiment
with
four
rates,
namely,
0,
300,
450,
600
kg
ha–1
yr–1
was
conducted
determine
effects
on
fractions,
microbial
(MNC),
enzyme
activity,
biomass
rice–wheat
rotation.
Results
increased
POC
concentrations
by
2.88–8.41%
14.6–41.2%,
respectively,
but
did
not
MAOC.
The
ratio
MAOC
reduced
addition,
indicating
that
decreased
stability.
concentration
7.32–22.5%
its
contribution
4.14–13.7%.
activity
β-1,4-N-acetyl-glucosaminidase
decreased,
while
activities
leucine
amino
peptidase
acid
phosphatase
were
under
P
addition.
Structural
equation
modeling
random
forest
revealed
N-induced
decrease
pH
promoted
accrual
increasing
root
biomass,
consequently
improving
POC.
Conclusions
likely
more
vulnerable
than
acidification
primary
driver
for
promoting
soils.
Frontiers in Microbiology,
Journal Year:
2024,
Volume and Issue:
15
Published: Oct. 10, 2024
Grazing
has
been
shown
to
impact
the
soil
environment
and
microbial
necromass
carbon
(MNC),
which
in
turn
regulates
organic
(SOC).
However,
sequestration
potential
of
fungi
bacteria
under
different
stocking
rates
remains
unclear,
limiting
our
understanding
grazing
management.
In
2004,
we
established
experiments
desert
steppe
northern
China
with
four
rates.
Our
findings
indicate
that
MNC
decreased
moderate
heavy
grazing,
while
light
did
not
significantly
differ
from
no
grazing.
Notably,
reduction
fungal
carbon,
rather
than
bacterial
was
primarily
responsible
for
contribution
SOC.
This
difference
is
attributed
varying
effects
sheep
on
community
characteristics,
including
richness,
diversity,
composition.
Thus,
accurately
predict
dynamics
grassland
ecosystems,
it
essential
consider
ecological
impacts
communities
may
vary
management
practices.
