International Journal of Digital Earth,
Journal Year:
2023,
Volume and Issue:
16(1), P. 1094 - 1107
Published: March 23, 2023
Mapping
soil
organic
matter
(SOM)
content
has
become
an
important
application
of
digital
mapping.
In
this
study,
we
processed
all
Sentinel-2
images
covering
the
bare-soil
period
(March
to
June)
in
Northeast
China
from
2019
2022
and
integrated
observation
results
into
synthetic
materials
with
four
defined
time
intervals
(10,
15,
20,
30
d).
Then,
used
corresponding
different
periods
conduct
SOM
mapping
determine
optimal
interval
before
finally
assessing
impacts
adding
environmental
covariates.
The
showed
following:
(1)
mapping,
highest
accuracy
was
obtained
using
day-of-year
(DOY)
120
140
20
d
intervals,
as
well
ranked
follows:
>
15
10
d;
(2)
when
at
predict
SOM,
best
for
predicting
always
within
May;
(3)
covariates
effectively
improved
performance,
multiyear
average
temperature
most
factor.
general,
our
demonstrated
valuable
potential
imagery,
thereby
allowing
detailed
large
areas
cultivated
soil.
Water Resources Research,
Journal Year:
2024,
Volume and Issue:
60(2)
Published: Feb. 1, 2024
Abstract
Wildfires
are
a
worldwide
disturbance
with
unclear
implications
for
stream
water
quality.
We
examined
chemistry
responses
immediately
(<1
month)
following
wildfire
by
measuring
over
40
constituents
in
four
gauged
coastal
watersheds
that
burned
at
low
to
moderate
severity.
Three
of
the
also
had
pre‐fire
concentration‐discharge
data
14
constituents:
suspended
sediment
(SS
fine
),
dissolved
organic
and
inorganic
carbon
(DOC,
DIC),
specific
UV
absorbance
(SUVA),
major
ions
(Ca
2+
,
K
+
Mg
Na
Cl
−
F
select
trace
elements
(total
Mn,
Fe).
In
all
watersheds,
post‐fire
concentrations
SS
DOC,
Ca
changed
when
compared
data.
Post‐fire
changes
DIC,
SUVA,
total
Fe
were
found
least
two
three
streams.
For
detectable
wildfire,
slopes
relationships
commonly
resulted
stronger
enrichment
trends
or
weaker
dilution
trends,
suggesting
new
contributing
sources
surficial
near
surface.
However,
few
geogenic
solutes,
displayed
nearly
sites
post‐fire.
Moreover,
fire‐induced
constituent
concentration
highly
discharge
site‐dependent.
These
similarities
differences
across‐site
emphasize
need
deeper
understanding
landscape‐scale
solute
pathways.
Our
findings
highlight
importance
being
explicit
about
reference
points
both
assessment
changes.
Global Change Biology,
Journal Year:
2024,
Volume and Issue:
30(6)
Published: June 1, 2024
Wildfires
directly
emit
2.1
Pg
carbon
(C)
to
the
atmosphere
annually.
The
net
effect
of
wildfires
on
C
cycle,
however,
involves
many
interacting
source
and
sink
processes
beyond
these
emissions
from
combustion.
Among
those,
role
post-fire
enhanced
soil
organic
(SOC)
erosion
as
a
mechanism
remains
essentially
unquantified.
can
greatly
enhance
due
loss
protective
vegetation
cover
changes
structure
wettability.
Post-fire
SOC
acts
when
off-site
burial
stabilization
eroded
after
fire,
together
with
on-site
recovery
content,
exceed
losses
during
its
transport.
Here
we
synthesize
published
data
evaluate
overall
potential
act
longer-term
sink.
To
explore
quantitative
importance,
also
model
magnitude
at
continental
scale
using
2017
wildfire
season
in
Europe.
Our
estimations
show
that
ability
water
first
year
could
account
for
around
13%
produced
by
wildland
fires.
This
indicates
is
quantitatively
important
process
balance
fires
highlights
need
more
field
further
validate
this
initial
assessment.
Limnology and Oceanography Letters,
Journal Year:
2023,
Volume and Issue:
9(1), P. 70 - 80
Published: Oct. 18, 2023
Abstract
Coastal
mountain
rivers
export
disproportionately
high
quantities
of
terrestrial
organic
carbon
(OC)
directly
to
the
ocean,
feeding
microbial
communities
and
altering
coastal
ecology.
To
better
predict
mitigate
effects
wildfires
on
aquatic
ecosystems
resources,
we
must
evaluate
relationships
between
fire,
hydrology,
export,
particularly
in
fire‐prone
western
United
States.
This
study
examined
spatiotemporal
particulate
dissolved
OC
(POC
DOC,
respectively)
black
(PBC
DBC,
from
five
watersheds
following
2020
CZU
Lightning
Complex
Fires
(California,
USA).
Despite
variability
watershed
burn
extent
(20–98%),
annual
POC,
PBC,
DBC
concentrations
remained
relatively
stable
among
different
watersheds.
Instead,
they
correlated
significantly
with
discharge.
Our
findings
indicate
that
rather
than
extent,
is
a
primary
driver
post‐fire
International Journal of Digital Earth,
Journal Year:
2023,
Volume and Issue:
16(1), P. 1094 - 1107
Published: March 23, 2023
Mapping
soil
organic
matter
(SOM)
content
has
become
an
important
application
of
digital
mapping.
In
this
study,
we
processed
all
Sentinel-2
images
covering
the
bare-soil
period
(March
to
June)
in
Northeast
China
from
2019
2022
and
integrated
observation
results
into
synthetic
materials
with
four
defined
time
intervals
(10,
15,
20,
30
d).
Then,
used
corresponding
different
periods
conduct
SOM
mapping
determine
optimal
interval
before
finally
assessing
impacts
adding
environmental
covariates.
The
showed
following:
(1)
mapping,
highest
accuracy
was
obtained
using
day-of-year
(DOY)
120
140
20
d
intervals,
as
well
ranked
follows:
>
15
10
d;
(2)
when
at
predict
SOM,
best
for
predicting
always
within
May;
(3)
covariates
effectively
improved
performance,
multiyear
average
temperature
most
factor.
general,
our
demonstrated
valuable
potential
imagery,
thereby
allowing
detailed
large
areas
cultivated
soil.
