Frontiers in Plant Science,
Journal Year:
2024,
Volume and Issue:
15
Published: Nov. 18, 2024
Introduction
This
study
explores
how
elevated
CO
2
concentration
may
alter
the
source-sink
dynamics
in
rice
by
providing
additional
carbon
for
photosynthesis,
thereby
affecting
nutrient
absorption
and
distribution.
Methods
A
free-air
enrichment
experiment
was
conducted
on
a
japonica
cultivar
Wuyunjing
27
2017
2018
growing
seasons.
The
plants
were
exposed
to
ambient
level
(increased
200
μmol·mol-1)
two
manipulation
treatments
(control
with
no
leaf
cutting
off
top
three
leaves
at
heading).
Results
significantly
increased
above-ground
biomass
straw
non-structural
carbohydrate
an
average
of
19.3%
12.5%,
respectively.
Significant
changes
concentrations
N,
S,
Fe,
Zn
noted
under
,
decreases
7.1,
7.2,
11.6,
10.1%,
exposure
enhanced
elements
accumulation,
yet
it
had
minimal
impact
their
distribution
across
different
organs.
When
compared
intact
rice,
removing
heading
reduced
36.8%
content
44.8%.
Leaf-cutting
generally
stem,
leaf,
grain,
likely
due
effect
from
accumulation.
element
accumulation
shifted
allocation
It
proportion
stems
while
presence
grains.
Discussion
Our
suggests
that
dilution
cause
decrease
mineral
because
increase
carbohydrates.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: May 27, 2024
Abstract
Mercury
(Hg),
a
potent
neurotoxin
posing
risks
to
human
health,
is
cycled
through
vegetation
uptake,
which
susceptible
climate
change
impacts.
However,
the
extent
and
pattern
of
these
impacts
are
largely
unknown,
obstructing
predictions
Hg’s
fate
in
terrestrial
ecosystems.
Here,
we
evaluate
effects
on
elemental
Hg
[Hg(0)]
uptake
using
state-of-the-art
global
model
(CLM5-Hg)
that
incorporates
plant
physiology.
In
business-as-usual
scenario,
Hg(0)
sink
predicted
decrease
by
1870
Mg
yr
−1
2100,
~60%
lower
than
present-day
condition.
We
find
potential
decoupling
between
trends
CO
2
assimilation
process
21st
century,
caused
decreased
stomatal
conductance
with
increasing
.
This
implies
substantial
influx
into
aquatic
ecosystems,
an
elevated
threat
warrants
consideration
during
evaluation
effectiveness
Minamata
Convention.
Grasslands,
standing
as
one
of
Earth's
major
ecosystems,
offer
numerous
services
vital
to
human
well-being.
The
productivity
grasslands
hinges
on
the
availability
soil
reactive
nitrogen,
which
is
highly
sensitive
climatic
variations.
Using
an
extensive
synthesis
1242
experimental
observations,
reinforced
by
multiple
models,
we
show
that
warming
a
single
driver
climate
change
intensifies
nitrogen
dynamics
in
grasslands.
This
could
lead
increases
net
primary
1%
9%
and
escalate
leakage
into
environment
22%
141%.
Under
SSP2-4.5
scenario,
foresee
annual
boost
17
million
tons
per
year
(Tg
yr-1)
inputs,
predominantly
via
biological
fixation,
compared
baseline
scenario
2050.
Total
harvest
projected
climb
12
Tg
yr-1.
However,
surplus
surge
expected
increase
5
yr-1,
potentially
intensifying
pollution.
To
counter
this,
adaptation
measures
must
aim
at
curtailing
losses
while
preserving
increased
harvest.
reduce
input
10
20
respectively,
boosting
yielding
economic
gains
up
121
billion
USD
In
shaping
policies,
it
critical
balance
potential
benefits
drawbacks
forging
effective
management
approaches.
