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@ARTICLE{Groh:865062,
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 discussions},
volume = {2019},
issn = {1812-2108},
publisher = {Soc.},
reportid = {FZJ-2019-04624},
pages = {1 - 24},
year = {2019},
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, 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 this
study was to investigate the response of key variables in
four different soils and for two different climates in
Germany with different aridity index: 1.09 for the wetter
(range: 0.82 to 1.29) and 1.57 for the drier climate (range:
1.19 to 1.77), by using high-precision weighable lysimeters.
According to a “space-for-time” concept, intact soil
monoliths that were moved to sites with contrasting climatic
conditions have been monitored from April 2011 until
December 2018.Evapotranspiration 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 the main 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 overall 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 (ground
water 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 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
optimal 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},
doi = {10.5194/hess-2019-411},
url = {https://juser.fz-juelich.de/record/865062},
}