Abstract.
This
study
aimed
to
investigate
the
olive,
iconic
tree
of
Mediterranean
basin,
seasonality
(Hg)
mercury
pollution.
Hg
concentrations
foliage,
stems,
soil
surface,
and
litter
were
analyzed
on
monthly
basis
in
ancient
olive
trees
growing
two
groves
Lebanon,
Bchaaleh
Kawkaba
(1300
672
m.a.s.l
respectively).
A
significantly
lower
concentration
was
registered
stems
(~7–9
ng/g)
with
respect
foliage
(~35–48
both
sites
highest
late
winter-early
spring
lowest
summer.
It
is
noteworthy
that
fruits
also
have
(~7–11
ng/g).
The
has
content
(~62–129
likely
inherited
through
cumulated
biomass
(~
63–76
good
covariation
observed
between
our
time-series
analysis
those
pCO2
atmospheric
Northern
hemisphere
confirms
pollution
can
be
studied
trees.
More
precisely,
sampling
recommended
if
objective
assess
tree's
susceptibility
uptake.
may
draw
an
adequate
baseline
for
global
inventories
vegetation
uptake
new
studies
reconstructing
regional
past
present.
Critical Reviews in Environmental Science and Technology,
Journal Year:
2021,
Volume and Issue:
52(21), P. 3763 - 3786
Published: Aug. 12, 2021
Forest
ecosystem
accounts
for
31%
of
global
land
areas
and
plays
a
key
role
in
the
biogeochemical
cycling
mercury
(Hg).
In
this
critical
review,
datasets
Hg
flux
measurements
isotopic
compositions
environmental
compartments
forests
last
three
decades
are
synthesized
to
examine
budgets
mass
balance
storages.
The
primary
goal
synthesis
is
provide
insight
into
source,
transportation,
translocation
fate
legacy
forests.
Existing
data
indicate
that
represent
largest
atmospheric
sink
terrestrial
ecosystem,
with
total
deposition
2200–3400
Mg
yr−1
(i.e.,
relative
40–65%
pool
size)
500–1100
Gg
stored
surface
soils
vegetation.
climate
cover
changes,
deforestation
wildfire
re-volatilize
several
hundred
tons
atmosphere,
thus
increasing
ecological
risk
regional
environments.
Vegetative
uptake
Hg0
vapor
from
air
predominantly
controls
accumulation
fractionation
atmosphere
With
ongoing
emission
reduction
anthropogenic
sources
required
by
Minamata
Convention,
an
integrated
assessment
on
changing
processes
response
human
natural
perturbations
emissions,
climate,
use
needed.
Minerals,
Journal Year:
2023,
Volume and Issue:
13(5), P. 688 - 688
Published: May 18, 2023
Trees
may
represent
useful
long-term
monitors
of
historical
trends
atmospheric
pollution
due
to
the
trace
elements
stored
along
tree
rings
caused
by
modifications
in
environment
during
a
tree’s
life.
Chestnut
(Castanea
sativa
Mill.)
trunk
sections
were
used
document
yearly
evolution
Hg
world-class
mining
district
Monte
Amiata
(MAMD;
Central
Italy)
and
exploited
until
1982.
An
additional
source
emissions
area
have
been
active
geothermal
power
plants.
A
marked
decrease
(from
>200
µg/kg
<100
µg/kg)
contents
heartwood
is
recorded,
likely
because
mine
closure;
average
(tens
recent
years
remain
higher
than
reference
~150
km
away
from
(average
4.6
µg/kg).
barks,
recording
present-day
pollution,
systematically
show
concentrations
sapwood
(up
394
area).
This
study
shows
that
be
good
record
changes
areas
affected
activity
plants
can
as
low-cost
biomonitoring
method
for
impact
minimization
optimal
resource
land
management.
Biogeosciences,
Journal Year:
2022,
Volume and Issue:
19(17), P. 4415 - 4429
Published: Sept. 14, 2022
Abstract.
Trees
predominantly
take
up
mercury
(Hg)
from
the
atmosphere
via
stomatal
assimilation
of
gaseous
elemental
Hg
(GEM).
is
oxidised
in
leaves/needles
and
transported
to
other
tree
anatomy
including
bole
wood,
where
it
can
be
stored
long-term.
Using
associated
with
growth
rings
facilitates
archiving
historical
GEM
concentrations.
Nonetheless,
there
are
significant
knowledge
gaps
on
cycling
within
trees.
We
investigate
archived
rings,
internal
cycling,
differences
uptake
mechanisms
Norway
spruce
European
larch
sampled
1
km
a
HgCl2-contaminated
site
using
total
(THg)
stable
isotope
analyses.
Tree
ring
samples
indicative
increases
THg
concentrations
(up
521
µg
kg−1)
background
period
(BGP;
facility
closed;
1992–present)
secondary
industrial
(2ndIP;
no
HgCl2
wood
treatment;
1962–1992)
primary
(1stIP;
active
≈
1900–1962).
Mass-dependent
fractionation
(MDF)
data
shifted
negative
during
periods
(δ202Hg
1stIP:
−4.32
±
0.15
‰,
2ndIP:
−4.04
0.32
BGP:
−2.83
0.74
‰;
SD).
Even
accounting
for
−2.6
‰
MDF
shift
uptake,
these
emissions
derived
activity
being
enriched
lighter
isotopes
reduction
Hg0
volatilisation.
Similar
(δ202Hg:
−3.90
0.30
SD)
bark
(137
105
suggests
that
downward
transport
also
dominant
mechanism
(reflective
stomatal-uptake
shift)
rather
than
deposition
bark.
was
sapwood
all
trees
across
both
species.
This
may
indicate
long-term
storage
fraction
or
xylem
solution.
observed
small
range
odd-isotope
mass-independent
(MIF).
Differences
Δ199Hg
between
different
activities
were
(Δ199Hg
0.00
0.03
−0.06
0.04
−0.13
SD),
we
suggest
MIF
signatures
conserved
(reflect
source
signatures).
These
advance
our
understanding
physiological
processing
provide
critical
direction
future
research
into
use
as
archives
atmospheric
Hg.
The Science of The Total Environment,
Journal Year:
2022,
Volume and Issue:
856, P. 158937 - 158937
Published: Sept. 24, 2022
Atmospheric
mercury
(Hg)
is
largely
assimilated
by
vegetation
and
subsequently
transferred
to
the
soil
litterfall,
which
highlights
role
of
forests
as
one
largest
global
Hg
sinks
within
terrestrial
ecosystems.
We
assessed
pool
in
aboveground
biomass
(leaves,
wood,
bark,
branches
twigs),
deposition
flux
through
litterfall
over
two
years
(by
sorting
fallen
leaves,
twigs,
reproductive
structures
miscellaneous)
its
accumulation
profile
a
deciduous
forest
dominated
Betula
alba
from
SW
Europe.
The
total
birch
was
range
532-683
mg
ha-1,
showing
following
distribution
plant
tissues:
well-developed
leaves
(171
ha-1)
>
twigs
(160
bark
(159
bole
wood
(145
fine
(25
thick
(24
newly
sprouted
(20
ha-1).
fluxes
were
15.4
11.7
μg
m-2
yr-1
for
studied,
with
greatest
contribution
coming
(73
%).
In
profile,
mineral
(37.0
m-2)
an
order
magnitude
higher
than
organic
horizons
(1.0
m-2),
mostly
conditioned
parameters
such
bulk
density
thickness,
C
N
contents
presence
certain
Al
compounds.
Critical Reviews in Environmental Science and Technology,
Journal Year:
2023,
Volume and Issue:
54(6), P. 445 - 462
Published: Aug. 28, 2023
AbstractFoliage
uptake
of
atmospheric
elemental
mercury
(Hg0)
and
subsequent
translocation
by
the
phloem
is
main
pathway
for
Hg
accumulation
in
tree
rings.
Tree
rings
have
been
used
as
emerging
natural
archive
to
directly
reconstruct
centennial
trends
Hg0
level.
The
tree-ring
records
remote
regions
successfully
reconstructed
peak
anthropogenic
emissions
Europe
North
America
1960s
−
1970s
distinct
increase
Asia
since
1980s.
Combining
concentrations
isotopic
signatures
would
provide
historical
emission
source
shifts.
mechanisms
translocation,
specifically
radial
impacts
environmental
physiological
factors,
are
yet
be
clarified
explain
nonlinear
relation
between
concentration
signals
Thus,
we
recommend
trace
processes
their
fractionation
rings,
examine
relationship
profile
pollution
level
specific
species.
Finally,
suggest
develop
more
statistical
models
quantify
on
rings.Keywords:
Mercuryisotopestree
ringsinfluencing
factorshistorical
recordHANDLING
EDITORS:
Dan
Tsang
Lena
Q.
Ma
Disclosure
statementThe
authors
declare
no
competing
financial
interest.Additional
informationFundingThis
work
was
funded
National
Natural
Science
Foundation
China
[42122053
41977272]
Chongqing
[cstc2020jcyj-msxmX0063].
Biogeosciences,
Journal Year:
2023,
Volume and Issue:
20(3), P. 619 - 633
Published: Feb. 6, 2023
Abstract.
This
study
investigates
the
seasonality
of
mercury
(Hg)
concentration
olive
tree
foliage,
an
iconic
Mediterranean
basin.
Hg
concentrations
stems,
soil
surface,
and
litter
were
analyzed
on
a
monthly
basis
in
ancient
trees
growing
two
groves
Lebanon,
Bchaaleh
Kawkaba
(1300
672
m
a.s.l.
respectively).
A
significantly
lower
was
registered
stems
(∼7–9
ng
g−1)
comparison
to
foliage
(∼35–48
both
sites,
with
highest
late
winter–early
spring
lowest
summer.
It
is
noteworthy
that
fruits
also
have
low
(∼7–11
g−1).
The
has
content
(∼62–129
likely
inherited
through
cumulated
biomass
(∼63–76
good
covariation
observed
between
our
time
series
analysis
those
atmospheric
available
for
southern
Italy
western
basin
confirms
pollution
can
be
studied
trees.
Spring
sampling
recommended
if
objective
assess
trees'
susceptibility
uptake.
Our
draws
adequate
baseline
eastern
region
similar
climatic
inventories
vegetation
uptake,
addition
being
new
studies
reconstruct
regional
past
present.
