Soil Use and Management,
Journal Year:
2024,
Volume and Issue:
40(1)
Published: Jan. 1, 2024
Abstract
The
construction
of
dams
and
subsequent
water
level
fluctuations
significantly
alters
the
environmental
conditions
reservoir
ecosystems,
affecting
metabolic
pathways
CO
2
fixing
microorganisms
(CFMs)
carbon
storage
in
drawdown
areas.
We
investigated
response
soil
bacterial
communities
fixation
to
periodic
flooding
drying
at
different
elevations
by
collecting
surface
samples
(0–10
cm)
area
Three
Gorges
Reservoir.
results
show
that
increased
complexity
co‐occurrence
networks.
identified
reductive
citrate
cycle
(rTCA
cycle),
dicarboxylate‐hydroxybutyrate
(DC/4‐HB
3‐Hydroxypropionate
(3‐HP
cycle)
pentose
phosphate
(Calvin
as
main
pathways.
Notably,
inundation
duration
increased,
abundance
Calvin
its
key
gene
(
cbb
L)
gradually
decreased.
also
found
moisture,
pH
organic
components
affected
composition
These
findings
elucidate
evolutionary
trends
impacts
on
microbial‐mediated
cycling
processes
because
dam
construction.
Geoderma,
Journal Year:
2023,
Volume and Issue:
431, P. 116359 - 116359
Published: Jan. 30, 2023
Soil
dissolved
organic
matter
(DOM)
is
mainly
derived
from
the
microbial
degradation
of
matter.
Intense
freeze–thaw
cycles
(FTCs)
elicited
by
warming
alter
production
and
consumption
DOM
in
boreal
forest
soils,
but
little
known
about
interactions
between
soil
community
chemical
composition.
In
this
study,
a
FTCs
incubation
experiment
was
conducted
to
investigate
association
dynamics
community.
fingerprints
were
characterized
using
pyrolysis
gas
chromatography-mass
spectrometry
(Py-GC/MS)
technology,
bacterial
fungal
composition
analyzed
high-throughput
sequencing
bioinformatics.
Both
two
six
(2FTCs
6FTCs)
significantly
increased
carbon
(DOC)
NH4+-N
contents
at
0–10
cm
50–60
depths.
decreased
relative
abundance
aromatic
components
DOM,
whereas
increasing
polysaccharides
fatty
acid
methyl
esters
(FAMEs)
DOM.
The
lignin-derived
compounds
accelerated
microbial-derived
accumulated.
Also,
responded
more
sensitively
than
Significant
changes
network
observed
during
with
linkages,
shortened
average
path
lengths,
reduced
modularity
dominant
phyla,
α
diversity.
However,
only
length
higher
connectivity
indicated
that
enhanced
components.
led
shift
keystone
taxa
being
present
specific
molecules
competing
for
common
substrates.
Overall,
tended
activate
increase
availability,
which
could
promote
turnover
C
stabilization.
These
findings
provide
new
insights
into
molecular
mechanisms
soils
under
FTCs.
Heliyon,
Journal Year:
2022,
Volume and Issue:
8(11), P. e11674 - e11674
Published: Nov. 1, 2022
The
application
of
soil
beneficial
bacteria
(SBB)
in
agriculture
is
steadily
increasing
as
it
provides
a
promising
way
to
replace
chemical
fertilisers
and
other
supplements.
Although
the
role
SBB
biofertiliser
well
understood,
little
known
about
response
physiochemical
properties
via
change
enzymatic
activities
with
growth.
In
this
study,
sterilised
bulk
was
inoculated
Bacillus
subtilis
(BS)
Pseudomonas
fluorescens
(PF),
which
exhibit
excellent
characteristics
vitro
for
potentially
improving
quality.
It
found
that
contents
bioavailable
nitrogen
ammonium
increased
significantly,
up
34%
57%
relative
control.
This
resulted
from
enhancement
urease
activity
BS
PF
treatments
by
approximately
90%
70%,
respectively.
can
be
explained
microorganism
evident
larger
population
size
(0.78–0.97
CFU
mL−1/CFU
mL−1)
than
(0.55–0.79
(p
<
0.05).
Results
principal
component
analysis
also
reinforce
interaction
apparent
significant
relationship
between
microbial
biomass
carbon
Therefore,
concluded
induced
fertility
upregulation
because
bacterial
These
results
demonstrate
strategy
amendment,
particularly
nutrient
restoration.
