Ammonia‐oxidizing bacteria rather than ammonia‐oxidizing archaea dominates soil nitrification during vegetation restoration in karst areas
Land Degradation and Development,
Год журнала:
2024,
Номер
35(14), С. 4304 - 4313
Опубликована: Июль 4, 2024
Abstract
Soil
nitrification,
driven
by
ammonia‐oxidizing
archaea
(AOA)
and
bacteria
(AOB),
is
a
crucial
process
in
maintaining
the
soil
nitrogen
(N)
balance.
However,
influence
of
AOA
AOB
on
gross
nitrification
rates
(GNR)
response
to
vegetation
restoration
remains
unclear,
particularly
karst
regions.
In
this
study,
we
investigated
GNR
abundance,
diversity,
community
composition
across
after
restoration.
Four
land
use
types
were
examined:
plantation
forest
(PF),
forage
grass
(FG),
combination
cropland
(CR,
control).
ammonium
N
()
was
higher
compared
that
cropland,
whereas
nitrate
exhibited
opposite
trend.
reduced
55.4%–90.3%
restorations
cropland.
The
Chao1,
Shannon
index
lower
respectively.
abundance
diversity
than
those
but
unaffected
vegetative
Furthermore,
more
sensitive
community.
Specifically,
taxa
belonging
genera
Nitrosospira
Nitrosovibrio
decreased
efforts.
addition,
nutrients
availability
(e.g.,
,
phosphorus)
index)
main
factors
driving
GNR.
This
study
highlights
importance
during
emphasizes
necessity
optimize
management
ecosystems.
Язык: Английский
Synergistic effect of grassland plants and beneficial rhizosphere bacteria helps plants cope with overgrazing stress
BMC Plant Biology,
Год журнала:
2025,
Номер
25(1)
Опубликована: Май 10, 2025
Abstract
Background
Overgrazing
(OG)
is
an
important
driver
of
grassland
degradation
and
productivity
decline.
Highly
effective
synergy
between
plants
rhizosphere
growth-promoting
rhizobacteria
(PGPR)
may
be
a
major
way
for
to
effectively
cope
with
OG
stress.
There
have
been
few
reports
providing
solid
evidence
on
how
this
occurs.
Result
This
study
combined
multi-omics
analysis
the
interaction
effect
specific
root
exudate
PGPR
B68,
aiming
reveal
synergistic
regulatory
mechanism
L.
chinensis
under
overgrazing
The
results
showed
that
Leymus
history
can
recruit
beneficial
Phyllobacterium
sp.
B68
by
regulating
compounds(such
as
amino
acid
L-leucyl-L-alanine
alkaloid
cordycepin).
These
compounds
enhanced
colonization
promoting
chemotaxis
biofilm
formation.
pot
experiments
indicated
bacterial
isolates
used
bio
inoculants
increased
growth
(mainly
including
plant
height
biomass)
significantly
increasing
chlorophyll
content,
RuBisCO
activity,
soluble
sugar,
hormones
nutrient
content.
Metagenomics
show
inoculation
altered
soil
community
composition
function.
Additionally,
systemically
upregulated
expression
level
genes
involved
in
hormone
signaling,
sugar
transporters,
nitrogen
metabolism,
cell
division,
wall
modification
photosynthesis
promote
growth.
above
indicate
recruited
exudates
helps
adapt
stress
uptake
transport,
maintaining
homeostasis,
enhancing
related
metabolism.
Conclusion
provides
new
insights
into
positive
interactions
bacteria
stress,
offering
valuable
knowledge
developing
fertilizers
better
management
practices
degraded
rangeland
restoration
sustainable
agriculture
development.
Clinical
trial
number
Not
applicable.
Язык: Английский
Have Climate Factor Changes Jeopardized the Value of Qinghai Grassland Ecosystem Services within the Grass–Animal Balance?
Sustainability,
Год журнала:
2024,
Номер
16(19), С. 8463 - 8463
Опубликована: Сен. 28, 2024
Internal
and
external
environmental
changes
have
led
to
in
the
service
value
of
plateau
ecosystems.
Plateau
ecosystems
are
facing
a
risk
falling
into
“recession”.
Meanwhile,
climate
change
has
become
an
important
factor
affecting
grassland
In
this
paper,
from
perspective
how
factors
inhibit
ecosystem
services
grasslands,
we
adopt
equivalent
method
measure
eight
municipal
levels
Qinghai
Province
2000
2021.
We
also
construct
fixed
utility
model
test
affect
use
grass–animal
balance
as
mediating
effect
for
test.
The
results
study
showed
that
(1)
increase
temperature
precipitation
among
significantly
suppresses
plateau.
(2)
mediation
shows
grass–livestock
helped
suppress
effects
on
ecological
grassland.
(3)
heterogeneity
area
containing
Three-River-Source
National
Park
is
more
resistant
changes.
Climate
greater
impact
high
altitude
areas
significant
positive
sustained
low
carrying
pressure
index
status.
Therefore,
protection
ecosystems,
should
pay
attention
inputs
well
appropriate
grazing.
At
same
time,
can
provide
reference
decision-making
with
respect
natural
resources
or
restoration
under
factors.
Язык: Английский
Sheep rotational grazing strategy to improve soil organic carbon and reduce carbon dioxide emission from spring wheat in an arid region
Soil Research,
Год журнала:
2024,
Номер
62(5)
Опубликована: Июль 23, 2024
Context
Cultivating
forage
crops
is
crucial
to
improve
feed
production,
and
grazing
an
important
utilisation
method
soil
fertility.
Aim
Improving
organic
carbon
(SOC)
content
reducing
dioxide
(CO2)
emission
through
management
from
a
spring
wheat
field.
Methods
We
compared
sheep
rotational
control,
studied
their
effects
on
SOC
CO2
Key
results
Sheep
improved
(by
23.5%)
easily
oxidised
(EOC)
7.7%)
reduces
microbial
biomass
(MBC)
35.8%)
with
the
control.
reduced
cumulative
by
28.9%
33.0%
in
May
June
Conclusions
reduce
Implications
Based
our
short-term
study,
has
significant
effect
SOC,
EOC
MBC
contents
fields
arid
regions.
For
large-scale
assessment
of
fertility
emission,
more
investigation
for
different
soils
climates
necessary.
Furthermore,
long-term
study
also
necessary
better
understand
Язык: Английский