Coexisting oak species, including rear-edge populations, buffer climate stress through xylem adjustments

Tree Physiology
Elena GrandaJ Julio Camarero

Abstract

The ability of trees to cope with climate change is a pivotal feature of forest ecosystems, especially for rear-edge populations facing warm and dry conditions. To evaluate current and future forests threats, a multi-proxy focus on the growth, anatomical and physiological responses to climate change is needed. We examined the long-term xylem adjustments to climate variability of the temperate Quercus robur L. at its rear edge and the sub-Mediterranean Quercus pyrenaica Willd. Both species coexist at a mesic (ME, humid and warmer) and a xeric (XE, dry and cooler) site in northern Spain, the latter experiencing increasing temperatures in recent decades. We compared xylem traits at each site and assessed their trends, relationships and responses to climate (1960-2008). Traits included basal area increment, earlywood vessel hydraulic diameter, density and theoretical-specific hydraulic conductivity together with latewood oxygen (δ18O) stable isotopes and δ13C-derived water-use efficiency (iWUE). Quercus robur showed the highest growth at ME, likely through enhanced cambial activity. Quercus pyrenaica had higher iWUE at XE compared with ME, but limited plasticity of anatomical xylem traits was found for the two oak species. Similar ...Continue Reading

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Citations

Feb 23, 2019·Global Change Biology·Albert Vilà-CabreraAlistair S Jump
Apr 3, 2019·Tree Physiology·Jérôme PouzouletPhilippe E Rolshausen
Nov 21, 2018·Frontiers in Plant Science·Michele ColangeloFrancesco Ripullone
Dec 20, 2018·Frontiers in Plant Science·Mahmuda IslamAchim Bräuning
Sep 26, 2019·Tree Physiology·José M Torres-RuizSylvain Delzon

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