New Phytologist,
Год журнала:
2021,
Номер
231(3), С. 996 - 1007
Опубликована: Апрель 28, 2021
Summary
Wood
anatomical
traits
shape
a
xylem
segment’s
hydraulic
efficiency
and
resistance
to
embolism
spread
due
declining
water
potential.
It
has
been
known
for
decades
that
variations
in
conduit
connectivity
play
role
altering
hydraulics.
However,
evaluating
the
precise
effect
of
elusive.
The
objective
here
is
establish
an
analytical
linkage
between
grouping
tissue‐scale
hypothesized
increase
brings
improved
increased
pathway
redundancy.
could
also
reduce
speed
with
respect
pressure.
We
elaborate
on
this
trade‐off
using
graph
theory,
percolation
theory
computational
modeling
xylem.
results
are
validated
measurements
Acer
branch
Considering
only
species
vessels,
increases
improve
without
negatively
affecting
conductivity.
often
measured
index
fails
capture
totality
Variations
network
characteristics,
such
as
connectivity,
might
explain
why
trends
among
woody
species,
‘safety‐efficiency’
hypothesis,
weaker
than
expected.
Functional Ecology,
Год журнала:
2021,
Номер
36(1), С. 24 - 37
Опубликована: Окт. 13, 2021
Abstract
Classifying
the
diverse
ways
that
plants
respond
to
hydrologic
stress
into
generalizable
‘water‐use
strategies’
has
long
been
an
eco‐physiological
research
goal.
While
many
schemes
for
describing
water‐use
strategies
have
proven
be
quite
useful,
they
are
also
associated
with
uncertainties
regarding
their
theoretical
basis
and
connection
plant
carbon
water
relations.
In
this
review,
we
discuss
factors
shape
responses
assess
approaches
used
classify
a
plant's
strategy,
paying
particular
attention
popular
but
controversial
concept
of
continuum
from
isohydry
anisohydry.
A
predictive
framework
assessing
historically
elusive,
yet
recent
advances
in
physiology
hydraulics
provide
field
way
past
these
obstacles.
Specifically,
promote
idea
metrics
quantify
highly
dynamic
emergent
interaction
between
traits
environmental
conditions,
complexity
hindered
development
strategy
framework.
This
is
explored
using
model
identify:
(a)
distinct
temporal
phases
hydraulic
regulation
during
drought
underpin
responses,
(b)
how
variation
both
forcings
can
significantly
alter
common
characterize
strategies.
modelling
exercise
bridge
divide
various
conceptualizations
targeted
hypotheses
advance
understanding
quantification
status
across
spatial
scales.
Finally,
describe
frontiers
necessary
improve
capacity
concept,
including
further
investigation
below‐ground
determinants
relations,
data
collection
efforts
potential
scale
concepts
individuals
whole
regions.
free
Plain
Language
Summary
found
within
Supporting
Information
article.
New Phytologist,
Год журнала:
2020,
Номер
230(5), С. 1896 - 1910
Опубликована: Окт. 28, 2020
Summary
Global
warming
is
expected
to
exacerbate
the
duration
and
intensity
of
droughts
in
western
United
States,
which
may
lead
increased
tree
mortality.
A
prevailing
proximal
mechanism
drought‐induced
mortality
hydraulic
damage,
but
predicting
from
theory
climate
data
still
remains
a
major
scientific
challenge.
We
used
forest
inventory
plant
model
(HM)
address
three
questions:
can
we
capture
regional
patterns
with
HM‐predicted
damage
thresholds;
do
HM
metrics
improve
predictions
across
broad
spatial
areas;
what
are
dominant
controls
when
considering
stand
characteristics,
metrics,
simulated
stress?
found
that
amount
variance
explained
by
models
was
limited
(
R
2
median
=
0.10,
range:
0.00–0.52).
outputs,
including
carbon
assimilation
diagnostics,
moderately
prediction
US
compared
using
predictors
alone.
Among
factors
considered,
density
size
tended
be
some
most
critical
explaining
mortality,
probably
highlighting
important
roles
structural
overshoot,
development,
biotic
agent
host
selection
outbreaks
patterns.
Biogeosciences,
Год журнала:
2021,
Номер
18(2), С. 739 - 753
Опубликована: Фев. 1, 2021
Abstract.
Vegetation
optical
depth
(VOD)
retrieved
from
microwave
radiometry
correlates
with
the
total
amount
of
water
in
vegetation,
based
on
theoretical
and
empirical
evidence.
Because
vegetation
varies
relative
content
(as
well
as
biomass),
this
correlation
further
suggests
a
possible
relationship
between
VOD
plant
potential,
quantity
that
drives
hydraulic
behavior.
Previous
studies
have
found
evidence
for
scale
satellite
pixels
tens
kilometers
across,
but
these
comparisons
suffer
significant
scaling
error.
Here
we
used
small-scale
remote
sensing
to
test
link
remotely
sensed
potential.
We
placed
an
L-band
radiometer
tower
above
canopy
looking
down
at
red
oak
forest
stand
during
2019
growing
season
central
Massachusetts,
United
States.
measured
stem
xylem
leaf
potentials
trees
within
single-channel
algorithm
continuous
measurements
soil
moisture.
exhibited
diurnal
cycle
similar
peak
approximately
05:00
eastern
daylight
time
(UTC−4).
was
also
positively
correlated
both
dielectric
constant
over
season.
The
presence
moisture
leaves
did
not
affect
observed
our
VOD–water-potential
estimate
stand-level
values
radiative
transfer
parameter
parameter,
which
compared
published
literature.
Our
findings
support
use
temperate
forests.
New Phytologist,
Год журнала:
2021,
Номер
231(3), С. 996 - 1007
Опубликована: Апрель 28, 2021
Summary
Wood
anatomical
traits
shape
a
xylem
segment’s
hydraulic
efficiency
and
resistance
to
embolism
spread
due
declining
water
potential.
It
has
been
known
for
decades
that
variations
in
conduit
connectivity
play
role
altering
hydraulics.
However,
evaluating
the
precise
effect
of
elusive.
The
objective
here
is
establish
an
analytical
linkage
between
grouping
tissue‐scale
hypothesized
increase
brings
improved
increased
pathway
redundancy.
could
also
reduce
speed
with
respect
pressure.
We
elaborate
on
this
trade‐off
using
graph
theory,
percolation
theory
computational
modeling
xylem.
results
are
validated
measurements
Acer
branch
Considering
only
species
vessels,
increases
improve
without
negatively
affecting
conductivity.
often
measured
index
fails
capture
totality
Variations
network
characteristics,
such
as
connectivity,
might
explain
why
trends
among
woody
species,
‘safety‐efficiency’
hypothesis,
weaker
than
expected.
