Journal of Ecology,
Год журнала:
2023,
Номер
111(7), С. 1545 - 1560
Опубликована: Май 25, 2023
Abstract
Nitrogen
(N)
deposition
usually
increases
plant
tissue
N
concentrations
and
thus
phosphorus
(P)
demand
in
young
and/or
N‐limited
forests,
but
the
effect
on
P
has
rarely
been
assessed
N‐saturated
forests.
Impacts
of
18‐year
external
additions
(Control:
0,
Low
N:
50,
Moderate
N:100
High
150
kg
ha
−1
year
)
leaf
four
life‐forms
(tree,
shrub,
herb
liana),
fractions
bulk
rhizosphere
soils
were
examined
a
mature
tropical
forest
southern
China.
Leaf
N,
ratios
all
remained
stable
under
three
additions.
Among
soil
fractions,
moderate
labile
organic
increased
by
25%–33%
across
additions;
total
was
11.76%
8.87%
compared
with
control.
The
PLS‐PM
results
showed
that
path
coefficient
microbial
community
to
available
significantly
inorganic
decreased
than
improved
availability
through
microbe‐mediated
transformation:
taxonomic
diversity,
higher
diversity
could
enlarge
sources
nutrient
acquisition
stimulate
decomposition
recalcitrant
matters;
while
remaining
microorganisms
screened
N‐rich
environments
had
characteristics
resisting
addition
effects
maintained
efficient
acquisition.
Synthesis.
Our
findings
provide
novel
line
evidence
long‐term
did
not
increase
forest.
underlying
mechanism
is
plants
uptakes
therefore
nor
(a
stoichiometry)
an
already
ecosystem.
Different
rates
regulated
transformation
via
transition.
These
help
improve
understanding
modelling
biogeochemical
N–P
cycling
vegetation
productivity
ecosystems,
particularly
considering
fact
chronic
may
likely
lead
richness
even
saturation
many
forests
future.
Biology and Fertility of Soils,
Год журнала:
2024,
Номер
60(4), С. 457 - 470
Опубликована: Март 19, 2024
Abstract
Information
on
microbial
biomass
carbon
(MBC)
is
crucial
to
assess
their
stocks
and
role
for
plant
nutrient
release
in
soil.
Next
fumigation-extraction,
molecular
methods
are
routinely
used
estimate
the
contribution
of
fungi,
bacteria,
archaea
soil
community.
However,
more
information
links
between
these
different
indices
would
deepen
understanding
processes.
The
current
study
based
11
datasets,
which
contain
MBC
MBN
data
obtained
by
fumigation-extraction
bacterial,
archaeal,
fungal
gene
abundance,
totalling
765
points
from
agricultural,
forest,
rangeland
soils.
Some
datasets
additionally
provide
double-stranded
deoxyribonucleic
acid
(dsDNA)
ergosterol.
varied
around
median
206
µg
g
−1
followed
with
a
MB-C/N
ratio
4.1.
Median
abundance
declined
bacteria
(96
×
10
8
)
(4.4
fungi
(1.8
).
MBC/dsDNA
was
15.8
that
bacteria/dsDNA
5.8
.
relationships
dsDNA
as
well
bacterial
were
both
negatively
affected
pH
positively
clay
content.
ergosterol/MBC
fungi/ergosterol
ratios
0.20%
4.7
(n
),
respectively.
relationship
ergosterol
Our
suggests
combining
tools
allows
precise
insights
physiological
interactions
microorganisms
surrounding
environment.
Geoderma,
Год журнала:
2024,
Номер
442, С. 116803 - 116803
Опубликована: Фев. 1, 2024
Microbial
residues
as
the
key
component
of
stable
soil
organic
carbon
(SOC)
play
a
critical
role
in
stabilizing
SOC,
and
their
accumulation
is
influenced
by
plant
litter.
However,
how
microbial
different
aggregate
fractions
forest
soils
responds
to
changes
inputs
leaf
root
litter
remains
poorly
understood.
Here,
we
test
hypothesis
that
exclusion
has
greater
effects
on
than
leaf-litter
among
based
litter-input
manipulation
experiment
subtropical
coniferous
forest.
The
concentrations
bacterial,
fungal,
total
were
higher
large
macroaggregates
(>
2000
μm)
but
lower
small
(250–2000
μm).
Root
decreased
microaggregates
(<
250
μm),
fungal
microaggregates.
Fungal
had
proportions
SOC
(20.7–34.9%)
bacterial
(10.8–18.6%)
fractions,
other
fractions.
reduced
(14.5%,
15.7%,
15.3%,
respectively),
compared
reduction
observed
(10.8%,
7.1%,
8.4%,
respectively).
And
Soil
residue-carbon
coefficient
was
macroaggregates.
increased
microaggregates,
it
also
Proportions
more
strongly
related
live
biomass
nutrients
those
residues.
Our
results
suggest
exerts
stronger
these
vary
sizes.
Abstract
Detritus‐based
resources,
that
is,
plant
litter,
are
a
major
energy
source
for
many
living
organisms
and
considered
to
be
key
determinant
of
primary
production
nutrient
cycling.
Earthworms
among
the
most
important
macro‐detritivores
in
terrestrial
food
webs
play
crucial
role
facilitating
these
processes
ecosystems.
Yet,
influence
litter
quality
on
earthworm
nutrition,
consequently
soil
web
dynamics,
has
remained
largely
underexplored,
mainly
methodological
reasons.
Here,
we
combined
bulk
compound‐specific
stable
isotope
analysis
amino
acids
investigate
dietary
contribution
different
resources
species
ecological
groups.
Our
findings
show
earthworms
acquired
essential
from
bacterial
(~60%)
(~30%)
with
latter
increasing
importance
higher
quality,
resulting
lower
trophic
positions
across
species.
The
high
corresponds
dominance
bacteria
experimental
soil,
suggesting
served
as
an
intermediate
link
transferring
detritus‐based
earthworms.
Bacterial
contributions
were
notably
soil‐feeding
than
litter‐feeding
species,
likely
due
more
pronounced
ingestion
by
Overall,
our
study
indicates
group
macro‐detritivores,
earthworms,
receive
detrital
via
channel.
Further,
it
underscores
shaping
niches
detritivores,
thereby
influencing
overall
structure
webs.
