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javaux.com

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About Javaux

Manufacturer of foam for sport, leisure, healthcare, and automotive industries.

Javaux Headquarter Location

Zone Industrielle Maingournois

28130,

France

33 2 37 27 18 13

Latest Javaux News

Evaristo et al. reply

Jan 29, 2021

REPLYING TO M. Javaux, Y. Rothfuss, J. Vanderborght, H. Vereecken & N. Brüggemann Nature 536, 10.1038/nature18946 (2016) In the accompanying Comment 1 , Javaux et al. correct a mistake in equation (2) of our work 2 ; as they point out 1 , the mistake does not impact the central conclusion of our paper that ecohydrological separation is widespread 2 . However, equations (2) and (3) in ref. 2 calculate the source precipitation value of xylem water as the point where the xylem water evaporation line (EL) intersects the local meteoric water line (LMWL). In so doing, Javaux et al. 1 note that the mistake affects our finding 2 that “at 80% of the sites, the precipitation that supplies groundwater recharge and streamflow is different from the water that supplies parts of soil water recharge and plant transpiration”. There are two key points in our response. (1) We recognize the mistake now noted in equation (2) and thank Javaux et al. 1 for this correction. These authors 1 find that rainfall segregation could be observed at only 74% of the sites (as defined by the two criteria in ref. 1 ), and not 80% as we originally reported 2 . (2) Our work 2 presented evidence for ecohydrological separation based on a meta-analysis of isotopic dual liquid water isotope data (δ2H and δ18O) from 47 studies. This conclusion is supported by studies that analysed water vapour isotope data from the Tropospheric Emissions Spectrometer aboard NASA’s Aura satellite 3 and by global differences between annual precipitation and groundwater isotope compositions 4 , 5 . These global-in-scale lines of evidence support earlier field evidence 6 , 7 that ecohydrological separation (defined as plants using water of a character different to that of mobile water found in soils, groundwater and streamflow) is widespread, and is the rule rather than the exception. Ecohydrological separation was calculated using equation (1) in ref. 2 . It must be understood that equation (1) in ref. 2 is independent of the source precipitation analysis, which was calculated using equations (2) and (3) in that paper. Therefore, any issue with equation (2) in our paper, like the one raised by ref. 1 , does not affect the ecohydrological separation conclusion. We hope that this exchange will generate further interest in the use of stable O and H isotopes in plant water relation studies. References 1 Javaux, M., Rothfuss, Y., Vanderborght, J., Vereecken, H. & Brüggemann, N. Isotopic composition of plant water sources. Nature 536, http://dx.doi.org/10.1038/nature18947 (2016) 2 Evaristo, J., Jasechko, S. & McDonnell, J. J. Global separation of plant transpiration from groundwater and streamflow. Nature 525, 91–94 (2015) 3 Good, S. P., Noone, D. & Bowen, G. Hydrologic connectivity constrains partitioning of global terrestrial water fluxes. Science 349, 175–177 (2015)

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