The "isohydric trap": A proposed feedback between water shortage, stomatal regulation, and nutrient acquisition drives differential growth and survival of European pines under climatic dryness

Global Change Biology
Diego Salazar-TortosaJosé Ignacio Querejeta

Abstract

Climatic dryness imposes limitations on vascular plant growth by reducing stomatal conductance, thereby decreasing CO2 uptake and transpiration. Given that transpiration-driven water flow is required for nutrient uptake, climatic stress-induced nutrient deficit could be a key mechanism for decreased plant performance under prolonged drought. We propose the existence of an "isohydric trap," a dryness-induced detrimental feedback leading to nutrient deficit and stoichiometry imbalance in strict isohydric species. We tested this framework in a common garden experiment with 840 individuals of four ecologically contrasting European pines (Pinus halepensis, P. nigra, P. sylvestris, and P. uncinata) at a site with high temperature and low soil water availability. We measured growth, survival, photochemical efficiency, stem water potentials, leaf isotopic composition (δ13 C, δ18 O), and nutrient concentrations (C, N, P, K, Zn, Cu). After 2 years, the Mediterranean species Pinus halepensis showed lower δ18 O and higher δ13 C values than the other species, indicating higher time-integrated transpiration and water-use efficiency (WUE), along with lower predawn and midday water potentials, higher photochemical efficiency, higher leaf P, an...Continue Reading

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Citations

Nov 9, 2019·Global Change Biology·Iván Prieto, José I Querejeta
Aug 12, 2020·Journal of Environmental Management·B OrejaJ A Navarro-Cano
Mar 20, 2021·The Science of the Total Environment·Tong ZhangShenglei Fu
May 28, 2021·Science Advances·Paulo QuadriErika S Zavaleta
Jun 25, 2021·Ecological Applications : a Publication of the Ecological Society of America·Enrique AndiviaJuan F Ovalle

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