Geoderma,
Journal Year:
2023,
Volume and Issue:
439, P. 116678 - 116678
Published: Oct. 10, 2023
Alterations
in
aboveground
plant
litter
inputs
due
to
global
climate
change
can
strongly
soil
nitrogen
(N)
cycling,
which
will
influence
processes
and
functions.
However,
a
comprehensive
evaluation
for
the
effects
of
altered
on
N
cycling
is
not
available.
We
evaluated
these
using
meta-analysis
based
1829
observations
from
119
studies
across
different
ecosystems
including
forests,
shrublands
grasslands.
Results
showed
that
addition
significantly
increased
pools
total
(TN),
dissolved
organic
(DON),
ammonium
(NH4+),
nitrate
(NO3–)
microbial
biomass
(MBN)
by
4–––24
%,
while
removal
decreased
them
10–––42
%.
High
initial
TN
pool
weakened
positive
effect
TN.
Moreover,
net
mineralization
(+19
%),
DON
leaching
(+56
%)
nitrous
oxide
(N2O)
emission
(+27
whereas
reduced
(-10
NO3–
(+51
%).
The
response
was
stronger
broadleaved
forests
than
coniferous
negatively
correlated
with
mean
annual
temperature
precipitation.
responses
TN,
NH4+,
NO3–,
MBN
N2O
manipulation
increasing
input
rates.
Therefore,
had
strong
were
regulated
status,
ecosystems,
climates
experimental
conditions.
Our
results
provide
insights
into
understanding
how
affects
help
better
assess
under
change.
Nature Communications,
Journal Year:
2021,
Volume and Issue:
12(1)
Published: Aug. 11, 2021
Abstract
Plants
invest
a
considerable
amount
of
leaf
nitrogen
in
the
photosynthetic
enzyme
ribulose-1,5-bisphosphate
carboxylase-oxygenase
(RuBisCO),
forming
strong
coupling
and
capacity.
Variability
nitrogen-photosynthesis
relationship
indicates
different
use
strategies
plants
(i.e.,
fraction
allocated
to
RuBisCO;
fLNR),
however,
reason
for
this
remains
unclear
as
widely
are
adopted
photosynthesis
models.
Here,
we
comprehensive
database
situ
observations,
remote
sensing
product
chlorophyll
ancillary
climate
soil
data,
examine
global
distribution
fLNR
using
random
forest
model.
We
find
is
18.2
±
6.2%,
with
its
variation
largely
driven
by
negative
dependence
on
mass
per
area
positive
phosphorus.
Some
factors
light,
atmospheric
dryness,
pH,
sand)
have
influences
regionally.
This
study
provides
insight
into
globally
an
improved
understanding
potential.
Global Change Biology,
Journal Year:
2023,
Volume and Issue:
29(14), P. 3970 - 3989
Published: April 20, 2023
A
significant
increase
in
reactive
nitrogen
(N)
added
to
terrestrial
ecosystems
through
agricultural
fertilization
or
atmospheric
deposition
is
considered
be
one
of
the
most
widespread
drivers
global
change.
Modifying
biomass
allocation
primary
strategy
for
maximizing
plant
growth
rate,
survival,
and
adaptability
various
biotic
abiotic
stresses.
However,
there
much
uncertainty
as
whether
how
strategies
change
response
increased
N
inputs
ecosystems.
Here,
we
synthesized
3516
paired
observations
their
components
related
additions
across
worldwide.
Our
meta-analysis
reveals
that
addition
(ranging
from
1.08
113.81
g
m-2
year-1
)
by
55.6%
on
average.
has
stem
mass
fraction,
shoot
leaf
fraction
13.8%,
12.9%,
13.4%,
respectively,
but
with
an
associated
decrease
reproductive
(including
flower
fruit
biomass)
3.4%.
We
further
documented
a
reduction
root-shoot
ratio
root
27%
(21.8%-32.1%)
14.7%
(11.6%-17.8%),
addition.
Meta-regression
results
showed
effects
were
positively
correlated
mean
annual
temperature,
soil
available
phosphorus,
total
potassium,
specific
area,
area
per
plant.
Nevertheless,
they
negatively
N,
carbon/N
ratio,
carbon
content
well
amount
duration
In
summary,
our
suggests
may
alter
strategies,
leading
more
being
allocated
aboveground
organs
than
belowground
versus
trade-offs.
At
scale,
functional
traits
dictate
species
pattern
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: April 17, 2023
Abstract
Quantifying
the
stomatal
responses
of
plants
to
global
change
factors
is
crucial
for
modeling
terrestrial
carbon
and
water
cycles.
Here
we
synthesize
worldwide
experimental
data
show
that
conductance
(
g
s
)
decreases
with
elevated
dioxide
(CO
2
),
warming,
decreased
precipitation,
tropospheric
ozone
pollution,
but
increases
increased
precipitation
nitrogen
(N)
deposition.
These
vary
treatment
magnitude,
plant
attributes
(ambient
,
vegetation
biomes,
functional
types),
climate.
All
two-factor
combinations
(except
warming
+
N
deposition)
significantly
reduce
their
individual
effects
are
commonly
additive
tend
be
antagonistic
as
effect
sizes
increased.
We
further
rising
CO
would
dominate
future
across
biomes.
The
results
our
meta-analysis
provide
a
foundation
understanding
predicting
biomes
guiding
manipulative
experiment
designs
in
real
world
where
do
not
occur
isolation.
Frontiers in Plant Science,
Journal Year:
2022,
Volume and Issue:
13
Published: March 9, 2022
Soil
extracellular
enzymes
play
an
important
role
in
microbial
functions
and
soil
nutrient
cycling
the
context
of
increasing
N
deposition
globally.
This
is
particularly
for
Chinese
fir
(Cunninghamia
lanceolata)
forests
because
decline
fertility
induced
by
successive
rotation.
In
this
study,
we
aimed
to
determine
effects
simulated
(N30:
30
kg
ha-2
year-1;
N60:
60
year-1)
phosphorus
addition
(P20:
20
mg
kg-1;
P40:
40
kg-1)
on
activity
stoichiometry
related
C,
N,
P
fir.
The
results
showed
that
alone
increased
β-1,4
glucosidase
(BG)
but
decreased
N-acetyl-β-d-glucosidase
(NAG)
leucine
aminopeptidase
(LAP).
ratios
enzymes,
C:N
C:P,
alleviated
N-limitation,
aggravated
C-limitation.
enzyme
activity,
P40
ratio
BG
biomass
carbon
(MBC),
(NAG
+
LAP):MBC
ratio,
thereby
aggravating
C
restriction.
co-addition
significantly
affected
stoichiometry.
For
instance,
BG:MBC
under
N30
treatment,
which
intensified
pH
was
main
factor
influencing
these
variables
were
positively
correlated.
stoichiometric
relationships
reactions
coupled
with
pH,
total
nitrogen
(TN),
available
(AP).
Our
indicate
changes
characteristics
inputs
influence
activities
microorganisms
result
resource
acquisition
strategies.
study
provides
useful
insights
into
development
management
strategies
improve
productivity
scenarios
deposition.
Global Change Biology,
Journal Year:
2022,
Volume and Issue:
29(2), P. 477 - 504
Published: Oct. 22, 2022
Plant
secondary
metabolites
(SMs)
play
crucial
roles
in
plant-environment
interactions
and
contribute
greatly
to
human
health.
Global
climate
changes
are
expected
dramatically
affect
plant
metabolism,
yet
a
systematic
understanding
of
such
influences
is
still
lacking.
Here,
we
employed
medicinal
aromatic
plants
(MAAPs)
as
model
taxa
performed
meta-analysis
from
360
publications
using
1828
paired
observations
assess
the
responses
different
SMs
levels
accompanying
traits
elevated
carbon
dioxide
(eCO2
),
temperature
(eT),
nitrogen
deposition
(eN)
decreased
precipitation
(dP).
The
overall
results
showed
that
phenolic
terpenoid
generally
respond
positively
eCO2
but
negatively
eN,
while
total
alkaloid
concentration
was
increased
remarkably
by
eN.
By
contrast,
dP
promotes
all
SMs,
eT
exclusively
exerts
positive
influence
on
compounds.
Further
analysis
highlighted
dependence
SM
moderators
functional
types,
change
or
exposure
durations,
mean
annual
precipitation.
Moreover,
could
be
attributed
variations
C/N
ratio
soluble
sugar
levels,
trade-off
supposition
contributed
other
than
.
Taken
together,
our
predicted
distinctive
diverse
MAAPs
allowed
us
define
potential
responsible
for
these
variations.
Further,
linking
C-N
metabolism
growth-defence
balance
provided
biological
understandings
terms
metabolic
regulation.
