Microbiome,
Journal Year:
2021,
Volume and Issue:
9(1)
Published: Oct. 27, 2021
Abstract
Background
Nitrogen-fixing
prokaryotes
(diazotrophs)
contribute
substantially
to
nitrogen
input
in
mangrove
sediments,
and
their
structure
fixation
rate
(NFR)
are
significantly
controlled
by
environmental
conditions.
Despite
the
well-known
studies
on
diazotrophs
surficial
diversity,
structure,
ecological
functions
of
diazotrophic
communities
along
gradients
sediment
across
different
depths
largely
unknown.
Here,
we
investigated
how
biological
varied
with
depth
sediments
from
perspectives
both
NFR
communities.
Results
Through
acetylene
reduction
assay,
nifH
gene
amplicon
metagenomic
sequencing,
found
that
increased
but
diversity
decreased
sediments.
The
at
was
driven
salinity
exhibited
a
clear
divergence
partitioning
50
cm.
Among
genera
correlated
NFR,
Agrobacterium
Azotobacter
were
specifically
enriched
50–100
cm
while
Anaeromyxobacter
,
Rubrivivax
Methylocystis
Dickeya
Methylomonas
more
abundant
0–50
Consistent
higher
analysis
demonstrated
elevated
abundance
genes
(
nifH/D/K
)
deep
where
nitrification
amoA/B/C
denitrification
nirK
norB
became
less
abundant.
Three
metagenome-assembled
genomes
(MAGs)
indicated
facultatively
anaerobic
mixotrophic
lifestyles
as
they
contained
for
low-oxygen-dependent
metabolism,
hydrogenotrophic
respiration,
carbon
fixation,
pyruvate
fermentation.
Conclusions
This
study
demonstrates
depth-dependent
variability
terms
communities,
which
certain
extent
relieves
degree
limitation
Ecological Indicators,
Journal Year:
2021,
Volume and Issue:
129, P. 107989 - 107989
Published: July 20, 2021
Grassland
degradation
is
a
retrogressive
succession
of
grassland
vegetation,
which
leads
to
the
loss
biodiversity
and
ecosystem
functions.
Soil
microbiomes
play
critical
roles
in
functioning
services
ecosystems,
yet
little
known
about
how
their
diversity,
structure
co-occurrence
network
characteristics
respond
degradation.
Here,
we
used
lllumina
Miseq
technique
evaluate
soil
bacterial
fungal
communities
meadow
steppe
with
different
degrees
Northeastern
China.
Our
results
showed
that
Actinobacteria,
Proteobacteria,
Chloroflexi
Acidobacteria
were
dominant
phyla,
while
Ascomycota,
Basidiomycota,
Zygomycota
predominant
phyla.
The
relative
abundance
taxa
assigned
Gemmatimonadetes,
Firmicutes,
Deinococcus-Thermus
increased
increasing
degrees,
whereas
those
affiliated
Nitrospirae
decreasing
pattern.
Compared
bacteria,
most
phyla
decreased
gradually
along
gradient.
Bacterial
Shannon
diversity
index
possessed
similar
hump
pattern,
degree
have
responses
degradation,
indicating
fungi
are
more
sensitive
than
bacteria.
Both
community
structures
significantly
among
three
sites.
Changes
best
explained
by
salinity
pH.
Plant
nitrogen
concentration
aboveground
plant
tissues
also
important
factors
for
regulating
communities.
Co-occurrence
analysis
revealed
microbial
positive
interactions
average
strengthen
adaptability
microorganisms
These
findings
could
enhance
our
understanding
formation
maintenance
degraded
grasslands
development
new
indicator
management.
Journal of Advanced Research,
Journal Year:
2023,
Volume and Issue:
59, P. 129 - 140
Published: June 29, 2023
Soil
salinization
threatens
food
security
and
ecosystem
health,
is
one
of
the
important
drivers
to
degradation
many
ecosystems
around
world.
microorganisms
have
extremely
high
diversity
participate
in
a
variety
key
ecological
processes.
They
are
guarantees
for
soil
health
sustainable
development.
However,
our
understanding
function
under
change
increased
fragmented.
Here,
we
summarize
changes
microbial
influence
diverse
natural
ecosystems.
We
particularly
focus
on
bacteria
fungi
salt
stress
their
emerging
functions
(such
as
mediated
biogeochemical
processes).
This
study
also
discusses
how
use
microbiome
saline
soils
deal
with
supporting
ecosystems,
puts
forward
knowledge
gaps
research
directions
that
need
be
strengthened
future.
Due
rapid
development
molecular-based
biotechnology
(especially
high-throughput
sequencing
technology),
community
composition
functional
genes
been
extensively
characterized
different
habitats.
Clarifying
responding
pattern
microbial-mediated
nutrient
cycling
developing
utilizing
weaken
adverse
effects
plants
soil,
which
guiding
significance
agricultural
production
management
lands.
Soil Systems,
Journal Year:
2024,
Volume and Issue:
8(1), P. 11 - 11
Published: Jan. 15, 2024
Soil
salinity
is
a
serious
problem
facing
many
countries
globally,
especially
those
with
semi-arid
and
arid
climates.
can
have
negative
influences
on
soil
microbial
activity
as
well
chemical
physical
processes,
all
of
which
are
crucial
for
health,
fertility,
productivity.
negatively
affect
physiological,
biochemical,
genetic
attributes
cultivated
plants
well.
Plants
wide
variety
responses
to
stress
classified
sensitive
(e.g.,
carrot
strawberry),
moderately
(grapevine),
tolerant
(wheat)
(barley
date
palm)
depending
the
salt
content
required
cause
crop
production
problems.
Salinity
mitigation
represents
critical
global
agricultural
issue.
This
review
highlights
properties
classification
salt-affected
soils,
plant
damage
from
osmotic
due
salinity,
possible
approaches
(i.e.,
applied
nutrients,
inoculations,
organic
amendments,
physio-chemical
approaches,
biological
nano-management),
research
gaps
that
important
future
food
security.
The
strong
relationship
between
different
subdisciplines
(mainly,
biogeochemistry,
microbiology,
fertility
nutrition)
also
discussed.
Applied and Environmental Microbiology,
Journal Year:
2021,
Volume and Issue:
87(21)
Published: Aug. 18, 2021
Revealing
the
response
of
soil
bacterial
community
to
external
environmental
disturbances
is
an
important
but
poorly
understood
topic
in
microbial
ecology.
In
this
study,
we
evaluated
effect
high
salinity
on
composition
and
key
biogeochemical
processes
salinized
agricultural
soils
(0.22
19.98
dS
m
−1
).
