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@ARTICLE{Groh:874533,
author = {Groh, Jannis and Vanderborght, Jan and Pütz, Thomas and
Vogel, Hans-Jörg and Gründling, Ralf and Rupp, Holger and
Rahmati, Mehdi and Sommer, Michael and Vereecken, Harry and
Gerke, Horst H.},
title = {{R}esponses of soil water storage and crop water use
efficiency to changing climatic conditions: a
lysimeter-based space-for-time approach},
journal = {Hydrology and earth system sciences},
volume = {24},
number = {3},
issn = {1607-7938},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2020-01489},
pages = {1211 - 1225},
year = {2020},
abstract = {Future crop production will be affected by climatic
changes. In several regions, the projected changes in total
rainfall and seasonal rainfall patterns will lead to lower
soil water storage (SWS), which in turn affects crop water
uptake, crop yield, water use efficiency (WUE), grain
quality and groundwater recharge. Effects of climate change
on those variables depend on the soil properties and were
often estimated based on model simulations. The objective of
thisstudy was to investigate the response of key variables
in four different soils and for two different climates in
Germany with a different aridity index (AI): 1.09 for the
wetter (range: 0.82 to 1.29) and 1.57 for the drier (range:
1.19 to 1.77) climate. This is done by using high-precision
weighable lysimeters. According to a “space-for-time”
(SFT) concept, intact soil monoliths that were moved to
sites with contrasting climatic conditions have been
monitored from April 2011 until December
2017.Evapotranspiration (ET) was lower for the same soil
under the relatively drier climate, whereas crop yield was
significantly higher, without affecting grain quality.
Especially “non-productive” water losses
(evapotranspiration out of themain growing period) were
lower, which led to a more efficient crop water use in the
drier climate. A characteristic decrease of the SWS for
soils with a finer texture was observed after a longer
drought period under a drier climate. The reduced SWS after
the drought remained until the end of the observation period
which demonstrates carry-over of drought from one growing
season to another and the over all long-term effects of
single drought events. In the relatively drier climate,
water flow at the soil profile bottom showed a small net
upward flux over the entire monitoring period as compared
to downward fluxes (groundwater recharge) or drainage in
the relatively wetter climate and larger recharge rates in
the coarser- as compared to finer-textured soils. The large
variability of recharge from year to year and the
long-lasting effects of drought periods on the SWS imply
that long-term monitoring of soil water balance components
is necessary to obtain representative estimates. Results
confirmed a more efficient crop water use under
less-plant-available soil moisture conditions. Long-term
effects of changing climatic conditions on the SWS and
ecosystem productivity should be considered when trying to
develop adaptation strategies in the agricultural sector.},
cin = {IBG-3},
ddc = {550},
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:000520409300001},
doi = {10.5194/hess-24-1211-2020},
url = {https://juser.fz-juelich.de/record/874533},
}