Global Ecology and Conservation,
Год журнала:
2021,
Номер
29, С. e01716 - e01716
Опубликована: Июль 4, 2021
Soil
bacteria
have
been
widely
investigated
and
their
roles
in
terrestrial
ecosystems
are
relatively
well
understood.
The
soil
bacterial
community
potential
function
controlled
by
vegetation
factors
indicating
changes
microenvironment.
However,
there
is
a
knowledge
gap
regarding
microbial
influence
use
to
predict
the
change
metabolic
after
afforestation
desert
ecosystem.
Pinus
sylvestris
var.
mongolica
most
important
evergreen
species
desertified
northern
China.
Therefore,
we
used
16S
rRNA
high-throughput
sequencing
PICRUSt
platform
identify
across
stand
ages
(HQh:
half-mature
forest,
HQn:
nearly-mature
HQm:
mature
forest)
control
(CK,
natural
grassland)
Horqin
Desert.
characteristics
were
determined
clarify
edaphic
driving
reveal
effect
of
on
bacteria.
results
indicated
that
(1)
dominant
category
was
stable
but
changed
ages.
phyla
genera
Proteobacteria
Acidobacteria
Sphingomonas,
RB41,
respectively;
functions
from
carbohydrate
amino
acid
metabolism.
(2)
P.
plantations
significantly
increased
diversity
(P
<
0.05).
Catalase
correlated
with
(3)
factor
Urease
CK
plot.
Afforestation
organic
matter
(SOM)
HQh
HQn,
urease
restored
HQm.
affected
porosity
(SP)
total
nitrogen
(TN)
plot,
phosphorous
(TP)
SOM
HQh,
catalase
activity
forecasted
broke
traditional
grassland
ecological
balance,
established
new
forest
balance
changing
environment,
pattern
resource
acquisition
utilization.
This
may
herald
creation
deserts.
Our
provide
strong
evidence
evaluated
significance
arid
regions.
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
Abstract
Saltmarshes
are
suffering
from
severe
degradation
due
to
anthropogenic
activities,
leading
the
loss
of
blue
carbon
and
greenhouse
gas
(GHG)
emissions.
Given
significant
potential
biochar
in
mitigating
climate
change,
adding
saltmarshes
would
alleviate
this
situation.
This
study
investigated
effects
different
(made
Spartina
alterniflora
,
corn
straw,
Laminaria
japonica
)
their
aged
on
fraction
contents,
GHG
emissions,
microbial
community
structure
saltmarsh
soils
with
allochthonous
organic
matter
(
Enteromorpha
prolifera
addition.
After
60
days
incubation,
total
(TOC)
global
warming
(GWP)
biochar-amended
were
reduced
by
67.29–124.33%
4.91–123.24%,
respectively
p
<
0.05).
Biochar
proportion
labile
(dissolved
(DOC)
biomass
(MBC))
61.92–86.15%
In
addition,
relative
abundance
specific
functional
bacteria
(inc.
cellulolysis,
aromatic
compound
degradation,
xylanolysis)
involved
decomposition
20.02–37.82%
These
results
suggest
that
even
presence
high
levels
liable
matter,
application
has
a
sustained
effect
promoting
accumulation
reducing
is
regulated
decrease
associated
metabolism.
Therefore,
situ
restoring
sink
function
proposed
for
practical
engineering
future.
Graphical
Land Degradation and Development,
Год журнала:
2020,
Номер
32(6), С. 2143 - 2156
Опубликована: Дек. 29, 2020
Abstract
Understanding
the
changes
in
microbial
community
composition
wetlands
affected
by
different
types
of
degradation
can
help
enrich
theoretical
knowledge
about
wetland
degradation.
However,
studies
relative
role
microorganisms
under
are
rare
ecology.
Because
agricultural
development,
a
large
volume
groundwater
has
been
extracted
from
Sanjiang
Plain
over
last
few
decades,
which
caused
To
provide
information
for
development
and
protection
this
ecosystem,
investigations
into
processes
important.
The
aim
present
work
was
to
assess
impacts
on
soil
communities
four
Plain:
swamp
meadow
(SW),
(MW),
paddy
farmland
(PF),
cropland
(CL).
Both
16S
ITS
rRNA
gene
amplicon
sequencing
were
used
evaluate
diversity
bacteria
fungi.
A
total
638,758
effective
916,211
valid
internal
transcribed
spacer
sequences
obtained,
classified
11
fungal
40
bacterial
phyla.
dominant
phyla
Ascomycota
Proteobacteria,
respectively.
In
addition,
increased
abundances
Chloroflexi
Gemmatimonadetes,
but
Proteobacteria
Verrucomicrobia
significantly
decreased.
Shannon
index
SW
lower
than
those
other
investigated
sites.
Fungal
showed
no
significant
differences
degraded
wetlands.
addition
degradation,
reactions
their
clearly
coorelated
with
phosphorus
(TP),
potassium
(TK),
available
(AK),
organic
matter
(SOM),
formed
essential
criteria
that
influenced
communities.
Wetland
resulted
decrease
nutrient
decline
abundance
phylum
These
be
as
an
early
warning
signal
degrading
Plain.
