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@ARTICLE{GonzlezSanchis:888487,
author = {González-Sanchis, María and García-Soro, Juan M. and
Molina, Antonio J. and Lidón, Antonio L. and Bautista,
Inmaculada and Rouzic, Elie and Bogena, Heye R. and
Hendricks-Franssen, Harrie-Jan and del Campo, Antonio D.},
title = {{C}omparison of {S}oil {W}ater {E}stimates {F}rom
{C}osmic-{R}ay {N}eutron and {C}apacity {S}ensors in a
{S}emi-arid {P}ine {F}orest: {W}hich {I}s {A}ble to {B}etter
{A}ssess the {R}ole of {E}nvironmental {C}onditions and
{T}hinning?},
journal = {Frontiers in water},
volume = {2},
issn = {2624-9375},
address = {Lausanne},
publisher = {Frontiers Media},
reportid = {FZJ-2020-04951},
pages = {552508},
year = {2020},
abstract = {Water scarcity in semi-arid regions is expected to increase
under climate change, which will significantly affect forest
ecosystems by increasing fire risk, diminishing productivity
and water provisioning. Eco-hydrological forest management
is conceived here as an adequate strategy to buffer climate
change effects and increase forest resilience. Under this
context, soil moisture is a key variable to quantify the
impacts of eco-hydrological forest management on
forest-water relations. Cosmic-ray neutron and capacitance
probes are two different techniques for measuring soil
moisture, which differ greatly in the spatial scale of the
measurement support (i.e., few centimeters vs. several
hectares). This study compares the capability of both
methodologies in assessing soil water dynamics as a key
variable that reflects the effects of forest management in a
semi-arid environment. To this end, two experimental plots
were established in Sierra Calderona in the province of
Valencia in Spain in a post-fire regeneration Aleppo pine
forest with high tree density. One plot was thinned (T) and
the other remained as control (C). Nine capacitance probes
and one Cosmic Ray Neutron Probe (CRNP) were installed in
each plot. First, the CRNP was calibrated and validated, and
subsequently, the performance of both techniques was
analyzed by comparing soil moisture and its relationship
with environmental variables and stand transpiration. The
validation results confirmed the general reliability of CRNP
to obtain soil moisture under semi-arid conditions, with a
Kling-Gupta efficiency coefficient (KGE) between 0.75 and
0.84, although this performance decreased significantly when
dealing with extreme soil moisture (KGE: −0.06–0.02). A
significant effect of forest biomass and litter layer was
also observed on CRNP-derived soil moisture, which produced
an overestimation of soil moisture. The performance of both
methodologies was analyzed by partial correlations between
soil moisture and environmental variables and transpiration,
as well as by applying Boosted Regression Trees to reproduce
tree transpiration with each soil moisture measurement
technique together with the environmental variables. Both
methodologies were capable to reproduce tree transpiration
affected by soil moisture, environmental variables and
thinning, although CRNP always appeared as the most affected
by atmospheric driving forces},
cin = {IBG-3},
ddc = {333.7},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000659409100001},
doi = {10.3389/frwa.2020.552508},
url = {https://juser.fz-juelich.de/record/888487},
}