Wood anatomy and carbon-isotope discrimination support long-term hydraulic deterioration as a major cause of drought-induced dieback

Global Change Biology
Elena PellizzariMarco Carrer

Abstract

Hydraulic impairment due to xylem embolism and carbon starvation are the two proposed mechanisms explaining drought-induced forest dieback and tree death. Here, we evaluate the relative role played by these two mechanisms in the long-term by quantifying wood-anatomical traits (tracheid size and area of parenchyma rays) and estimating the intrinsic water-use efficiency (iWUE) from carbon isotopic discrimination. We selected silver fir and Scots pine stands in NE Spain with ongoing dieback processes and compared trees showing contrasting vigour (declining vs nondeclining trees). In both species earlywood tracheids in declining trees showed smaller lumen area with thicker cell wall, inducing a lower theoretical hydraulic conductivity. Parenchyma ray area was similar between the two vigour classes. Wet spring and summer conditions promoted the formation of larger lumen areas, particularly in the case of nondeclining trees. Declining silver firs presented a lower iWUE than conspecific nondeclining trees, but the reverse pattern was observed in Scots pine. The described patterns in wood anatomical traits and iWUE are coherent with a long-lasting deterioration of the hydraulic system in declining trees prior to their dieback. Retrospe...Continue Reading

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Citations

Jul 5, 2016·Frontiers in Plant Science·Georg von ArxMarco Carrer
Oct 21, 2016·Global Change Biology·Maxime CailleretJordi Martínez-Vilalta
Apr 6, 2017·Tree Physiology·Angela Luisa PrendinGeorg von Arx
Jun 4, 2019·Global Change Biology·Drew M P Peltier, Kiona Ogle
Mar 25, 2017·Tree Physiology·Michele ColangeloFrancesco Ripullone
Nov 7, 2019·Global Change Biology·Paulina F PuchiMarco Carrer
Mar 19, 2020·Tree Physiology·Natasa KiorapostolouGiai Petit
Feb 5, 2019·Frontiers in Plant Science·Maxime CailleretJordi Martínez-Vilalta
Mar 9, 2017·Frontiers in Plant Science·Michele ColangeloFrancesco Ripullone
Aug 14, 2020·Tree Physiology·Lucrezia UnterholznerStefan Mayr
Jun 27, 2021·The Science of the Total Environment·Daniel Moreno-FernándezMariano García
Sep 14, 2021·Frontiers in Plant Science·Cristina ValerianoJ Julio Camarero

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