Forests,
Год журнала:
2024,
Номер
16(1), С. 24 - 24
Опубликована: Дек. 26, 2024
The
diversity
of
arbuscular
mycorrhizal
fungi
(AMF)
is
a
crucial
indicator
for
determining
the
productivity
forest
ecosystems
and
assessing
degraded
areas.
At
present,
effect
tree
age
vegetation
restoration
strategies
on
AMF
in
karstic
rocky
desertification
areas
remains
unclear.
This
study
investigated
abundance
soils
planted
with
Delavaya
toxocarpa
Franch.
18,
11,
4
years
area
southwestern
China.
Additionally,
it
explored
community
composition
an
18-year-old
D.
plantation,
secondary
naturally
restored
since
2005,
abandoned
land
no
human
intervention.
High-throughput
sequencing
revealed
that
mean
Chao1
richness
indices
increased
age,
as
indicated
by
highest
α-diversity
plantations.
various
resulted
significant
differences
evenness
indices.
Although
(p
=
0.33)
were
found
between
different
strategies,
index
showed
decreasing
trend
from
plantation
to
then
land.
Overall,
soil
organic
carbon
(SOC),
total
nitrogen
(TN),
available
phosphorus
(AP)
significantly
influence
diversity.
TN,
AP,
hydrolysable
(HN),
urease
activity
(URE)
shape
composition.
These
properties
varied
strategies.
Our
findings
point
good
recovery
results
artificial
afforestation
process
accelerates
enhances
mutually
beneficial
relationship
compared
natural
restoration.
However,
selected
this
only
represents
stands
before
mature
forests,
microbial
structure
karst
after
over-mature
remain
be
studied.
Land Degradation and Development,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 10, 2025
ABSTRACT
Microbial
necromass
nitrogen
(MNN)
is
increasingly
recognized
as
a
major
source
of
soil
N,
playing
crucial
role
in
N
sequestration
and
sustaining
balance.
However,
quantitative
data
on
the
contribution
MNN
to
total
its
relationship
with
multifunctionality
(SMF)
karst
plantation
ecosystems
remain
lacking.
In
this
study,
(measured
via
amino
sugar
analysis)
SMF
(calculated
using
mean
value
method)
were
determined
across
five
plantations
unafforested
land
(control)
Wuling
Mountains
subtropical
China.
The
content
ranged
from
1.02
1.67
g
kg
−1
,
contributing
53.8%
75.4%
Cinnamomum
camphora
pure
forest
exhibiting
highest
values
among
all
stand
types
control.
afforestation
enhanced
nutrient
provision,
microbial
activity,
biomass,
increasing
by
54%
compared
functional
parameters
generally
higher
organic
horizon
than
topsoil
subsoil,
was
greater
subsoil.
Enzyme
stoichiometry
ratios
indicated
that
P
limitation
prevalent
both
control
soils,
positively
correlated
C/P
N/P
(
p
<
0.001).
Increases
closely
associated
SMF,
encompassing
available
(AN)
being
key
predictor
accumulation.
partial
least
squares
path
model
revealed
provision
contributed
accumulation,
AN
had
direct
effect
coefficient
0.72
it
0.01).
This
work
underscored
critical
potential
support
ecosystem
functioning
region.
Land Degradation and Development,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 26, 2025
ABSTRACT
Phosphorus
(P)
availability
constrains
plant
productivity
in
forest
ecosystems,
with
soil
functional
genes
involved
P
cycling
playing
a
pivotal
role
regulating
its
availability.
However,
the
effects
of
climatic
gradients
on
and
remain
unclear.
We
collected
90
samples
from
subtropical
Chinese
fir
plantations
along
north‐to‐south
gradient
to
evaluate
impact
phoD
‐harboring
bacteria
availability,
employing
high‐throughput
sequencing
biologically
based
approach.
The
lowest
organic
was
observed
mid
(0.35–1.48
mg
kg
−1
)
region
compared
south
(1.27–2.69
north
(0.81–2.34
),
inconsistent
trends
inorganic
P.
Lower
diversity
stronger
competition
subtropics,
higher
collaboration
subtropics.
Actinobacteria
positively
correlated
strongest
predictor
(Increase
mean
squared
error
=
17.63%).
Mechanistic
modelling
indicated
that
variations
nutrients
pH
altered
among
dominant
species,
thereby
enhancing
acid
phosphatase
activity
shifting
mineralization.
Our
findings
highlight
increased
may
enhance
P‐poor
soils
under
climate
warming.
Collectively,
this
study
offers
novel
insights
into
how
impacts
plantation
soils.
Plants,
Год журнала:
2025,
Номер
14(8), С. 1251 - 1251
Опубликована: Апрель 20, 2025
Soil
active
nitrogen
(N)
fractions
are
essential
for
plant
growth
and
nutrient
cycling
in
terrestrial
ecosystems.
While
previous
studies
have
primarily
focused
on
the
impact
of
vegetation
restoration
soil
karst
ecosystems,
role
microclimate
variation
rocky
desertification
areas
has
not
been
well
explored.
This
study
investigates
key
biotic
abiotic
factors
across
four
grades
desertification—non-rocky
(NRD),
light
(LRD),
moderate
(MRD),
intense
(IRD)—within
two
distinct
microclimates:
a
dry-hot
valley
humid
monsoon
zone
region
Guizhou
Province,
China.
We
evaluate
organic
carbon
(SOC),
total
(TN),
phosphorus
(TP),
nitrate
(NO3−-N),
ammonium
(NH4+-N),
microbial
biomass
(MBN),
soluble
(SON),
diversity.
Results
showed
that
SOC,
TN,
TP
were
significantly
higher
IRD
areas.
NO3−-N,
MBN,
SON
initially
decreased
before
increasing,
with
consistent
MBN
valley.
NH4+-N
did
differ
under
NRD
but
was
LRD,
MRD,
IRD.
The
had
most
grades.
Microclimate
influenced
N,
levels
LRD
MRD
conditions.
Plant
diversity
regeneration
varied
markedly
between
microclimates.
In
valley,
Artemisia
dominated
herbaceous
regeneration,
especially
Conversely,
more
diverse
Bidens
prevalent
Despite
declining
desertification,
displayed
greater
resilience.
These
findings
highlight
influencing
dynamics
gradients,
offering
insights
strategies
The
interaction
between
soil
characteristics
and
microbial
communities
is
crucial
for
poplar
growth
under
different
planting
densities.
Yet,
little
understood
about
their
relationships
how
they
respond
to
primary
environmental
drivers
across
varying
