Response of a grassland species to dry environmental conditions from water stable isotopic monitoring: no evident shift in root water uptake to wetter soil layers
Deseano Diaz, Paulina Alejandra; van Dusschoten, Dagmar; Kübert, Angelikaet al.
Centaurea jacea; Drought; Non-destructive monitoring; Root water uptake; Water stable isotopes; Soil Science; Plant Science
Abstract :
[en] Aims: We aimed at assessing the influence of above- and below-ground environmental conditions over the performance of Centaurea jacea L., a drought-resistant grassland forb species. Methods: Transpiration rate, CO2 assimilation rate, leaf water potential, instantaneous and intrinsic water use efficiency, temperature, relative humidity, vapor pressure deficit and soil water content in one plant and root length density in four plants, all grown in custom-made columns, were monitored daily for 87 days in the lab. The soil water isotopic composition in eleven depths was recorded daily in a non-destructive manner. The isotopic composition of plant transpiration was inferred from gas chamber measurements. Vertical isotopic gradients in the soil column were created by adding labeled water. Daily root water uptake (RWU) profiles were computed using the multi-source mixing model Stable Isotope Analysis in R (Parnell et al. PLoS ONE 5(3):1–5, 2010). Results: RWU occurred mainly in soil layer 0–15 cm, ranging from 79 to 44%, even when water was more easily available in deeper layers. In wet soil, the transpiration rate was driven mainly by vapor pressure deficit and light intensity. Once soil water content was less than 0.12 cm3 cm− 3, the computed canopy conductance declined, which restricted leaf gas exchange. Leaf water potential dropped steeply to around − 3 MPa after soil water content was below 0.10 cm3 cm− 3. Conclusion: Our comprehensive data set contributes to a better understanding of the effects of drought on a grassland species and the limits of its acclimation in dry conditions.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Deseano Diaz, Paulina Alejandra ; Université de Liège - ULiège > TERRA Research Centre ; Institute of Bio- and Geosciences, Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany
van Dusschoten, Dagmar ; Institute of Bio- and Geosciences, Plant Sciences (IBG-2), Forschungszentrum Jülich GmbH, Jülich, Germany
Brüggemann, Nicolas ; Institute of Bio- and Geosciences, Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany
Javaux, Mathieu ; Institute of Bio- and Geosciences, Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany ; Earth and Life Institute, Environmental Sciences (ELIE), Université catholique de Louvain (UCL), Louvain-la-Neuve, Belgium
Merz, Steffen ; Institute of Energy and Climate Research, Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, Jülich, Germany
Vanderborght, Jan ; Institute of Bio- and Geosciences, Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany
Vereecken, Harry ; Institute of Bio- and Geosciences, Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany
Dubbert, Maren ; Leibniz-Institut für Agrarlandschaftsforschung ZALF Gewässerökologie und Binnenfischerei Berlin, Iosotopebiogeochemistry and Gasfluxes, Müncheberg, Germany
Rothfuss, Youri ; Université de Liège - ULiège > Département GxABT > Echanges Eau - Sol - Plantes ; Institute of Bio- and Geosciences, Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany
Language :
English
Title :
Response of a grassland species to dry environmental conditions from water stable isotopic monitoring: no evident shift in root water uptake to wetter soil layers
Publication date :
21 September 2022
Journal title :
Plant and Soil
ISSN :
0032-079X
eISSN :
1573-5036
Publisher :
Springer Science and Business Media Deutschland GmbH
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