Journal of Soils and Sediments,
Год журнала:
2023,
Номер
23(9), С. 3298 - 3309
Опубликована: Июнь 5, 2023
Abstract
Purpose
Although
past
studies
have
found
well-constrained
soil
carbon
(C)/nutrient
ratios,
the
effects
of
increased
nitrogen
(N)
and
water
inputs
on
these
ratios
across
depths
rarely
been
assessed
in
semi-arid
grasslands.
Methods
In
this
study,
we
evaluated
contents
total
C,
N,
phosphorus
(P),
sulfur
(S),
their
stoichiometric
a
0–80
cm
profile
following
13
years
successive
N
(at
rates
5
15
g
m
−2
yearr
−1
)
addition
(180
mm
per
growing
season)
grassland
Mongolian
Plateau.
Results
0–10
layer,
long-term
tended
to
increase
C
but
decreased
P
S
compared
control.
The
addition,
as
observed
soil,
however,
were
not
consistent
with
that
deep
10–80
layers.
Water
entire
content
only
0–40
soil.
Moreover,
combined
generally
had
stronger
four
elements
whole
profile.
For
stoichiometry
elements,
low
rate
(5
year
C:N
P:S
soils,
high
(15
produced
opposite
effect.
Both
resulted
an
C:P,
C:S,
N:P,
N:S
ratios.
Similarly,
plots
received
water,
alone
while
caused
higher
fluctuations
six
elemental
However,
there
was
no
pattern
change
any
one
ratio,
independent
when
taking
into
account
depths.
Conclusion
Our
findings
showed
P,
highly
influenced
by
depth
could
be
modulated
increasing
precipitation.
These
results
need
carefully
considered
managing
ecological
environment
steppes.
Global Change Biology,
Год журнала:
2024,
Номер
30(3)
Опубликована: Март 1, 2024
Abstract
Emerging
evidence
points
out
that
the
responses
of
soil
organic
carbon
(SOC)
to
nitrogen
(N)
addition
differ
along
profile,
highlighting
importance
synthesizing
results
from
different
layers.
Here,
using
a
global
meta‐analysis,
we
found
N
significantly
enhanced
topsoil
(0–30
cm)
SOC
by
3.7%
(±1.4%)
in
forests
and
grasslands.
In
contrast,
subsoil
(30–100
initially
increased
with
but
decreased
over
time.
The
model
selection
analysis
revealed
experimental
duration
vegetation
type
are
among
most
important
predictors
across
wide
range
climatic,
environmental,
edaphic
variables.
contrasting
indicate
considering
deep
layers,
particularly
for
long‐term
continuous
deposition.
Finally,
lack
depth‐dependent
modeling
frameworks
has
likely
resulted
overestimation
changes
storage
under
Forest Ecosystems,
Год журнала:
2024,
Номер
11, С. 100172 - 100172
Опубликована: Янв. 1, 2024
Forest
soils
in
tropical
and
subtropical
areas
store
a
significant
amount
of
carbon.
Recent
frameworks
to
assess
soil
organic
matter
(SOM)
dynamics
under
evolving
global
conditions
suggest
that
dividing
bulk
SOM
into
particulate
mineral-associated
(POM
vs.
MAOM)
is
promising
method
for
identifying
how
contributes
reducing
warming.
Soil
macrofauna,
earthworms,
millipedes
have
been
found
play
an
important
role
facilitating
processes.
However,
these
two
co-existing
macrofaunae
impact
the
litter
decomposition
process
directly
formation
POM
MAOM
remains
unclear.
Here,
we
set
up
microcosm
experiment,
which
consisted
20
microcosms
with
four
treatments:
earthworm
addition
(E),
(M),
earthworm,
millipedes,
(E
+
M),
control
(only
addition)
five
replicates.
The
were
sterilized
prior
beginning
incubation
experiment
remove
any
existing
microbes.
After
incubating
samples
42
days,
properties
(mass,
C,
N
contents),
physicochemical
properties,
as
well
C
contents,
13C
abundance
0–5
5–10
cm
layers
measured.
Finally,
relative
influences
microbial
on
distribution
fractions
analyzed.
mass,
associated
all
treatments
significantly
decreased
after
incubation,
especially
treatment
E
M
(litter
mass:
−58.8%,
C:
−57.0%,
N:
−75.1%,
respectively),
while
biomass
E.
Earthworm
or
millipede
alone
showed
no
effects
carbon
(OC)
total
nitrogen
(TN)
content
fraction,
but
joint
both
increased
OC
TN
regardless
depth.
Importantly,
three
macrofauna
fraction.
More
than
65%
variations
throughout
can
be
explained
by
combination
properties.
Changes
layer
are
likely
due
decrease
pH
increase
arbuscular
mycorrhizal
fungi
(AMF),
those
probably
caused
increases
exchangeable
Ca
Mg,
gram-negative
(GN)
bacteria.
observed
changes
resulted
from
AMF,
GN,
(GP)
bacteria,
could
Mg
GN
results
indicate
coexistence
earthworms
accelerate
more
fractions.
This
novel
finding
helps
unlock
processes
complex
systems
serve
sinks
forests
addresses
importance
maintaining
C-neutral
atmospheric
climate
change.
International Journal of Molecular Sciences,
Год журнала:
2024,
Номер
25(7), С. 3786 - 3786
Опубликована: Март 28, 2024
Integrated
rice-fish
farming
has
emerged
as
a
novel
agricultural
production
pattern
to
address
global
food
security
challenges.
Aiming
determine
the
optimal,
scientifically
sound,
and
sustainable
stocking
density
of
red
claw
crayfish
(Cherax
quadricarinatus)
in
an
integrated
rice-crayfish
system,
we
employed
Illumina
high-throughput
16S
rRNA
gene
sequencing
evaluate
impact
different
densities
on
composition,
diversity,
function,
co-occurrence
network
patterns
soil
bacterial
communities.
The
high
reduced
diversity
evenness
community
during
mid-culture
stage.
Proteobacteria,
Actinobacteria,
Chloroflexi
most
prevalent
phyla
throughout
experimental
period.
Low
initially
boosted
relative
abundance
Actinobacteria
paddy
soil,
while
did
so
middle
final
stages.
There
were
90
distinct
functional
groups
identified
across
all
samples,
with
chemoheterotrophy
aerobic
being
abundant.
favored
these
groups,
whereas
enhanced
their
abundances
later
stages
cultivation.
Medium
led
more
complex
mid-
culture
period
showed
significant
correlations
communities,
total
nitrogen
(TN)
phosphorus
(TP)
concentrations
emerging
primary
factors
contributing
alterations
In
summary,
our
findings
demonstrated
that
significantly
impacted
microbiomes
environmental
at
varying
densities.
Our
study
contributed
theoretical
insights
into
profound
various
communities
soils.
Journal of Geophysical Research Biogeosciences,
Год журнала:
2022,
Номер
127(3)
Опубликована: Фев. 26, 2022
Abstract
Increasing
N
input
can
alter
soil
nutrient
availability
and
influence
plant
growth.
Previous
studies
focused
on
addition
effects
P
availability,
while
less
other
mineral
nutrients.
Besides,
how
duration
affects
has
remained
unclear.
Based
a
simulative
deposition
experiment
in
typical
steppe
with
four
levels
(0,
2,
10,
50
g
m
−2
yr
−1
)
under
three
(2,
5,
10
years),
we
determined
contents
of
nutrients
surface
soils.
In
the
0–10
cm
soil,
short‐term
(2‐year)
significantly
increased
exchangeable
Ca
(+7.2%)
decreased
Mg
(−22.5%)
as
compared
control,
available
Fe,
Cu,
Zn,
but
Mn
remarkably
(+80.4%).
Medium‐term
(5‐year)
raised
total
Ca,
Na
Mg.
The
response
patterns
these
were
largely
similar
10–20
weaker
significant
only
at
high
inputs
(50
).
Long‐term
(10‐year)
base
cations
(K,
Na,
Mg)
micronutrients
(Fe,
Mn,
Zn)
by
an
average
32.1%
20.4%,
respectively,
across
two
depths.
Influences
pH
growth
showed
remarkable
differences
among
different
addition.
These
findings
indicate
that
intensity
jointly
this
should
be
considered
nutrient‐cycling
modeling.
