D-STRESS-CH – Drought STress REsponse of Scots pineS: linking Carbon allocation and Hydraulic pathways
Climate change will likely increase drought stress with consequences on forest productivity and tree mortality. While drought broadly impacts formation and functioning of water conducting cells, plant-level hydraulic architecture, carbon allocation and tree fitness, the relative importance and intertwined roles of these mechanisms is debated.
Unifying expertise in tree-ring anatomy, plant-water relations, and growth-climate interactions, D-STRESS-CH will quantify how prolonged drought affects hydraulic functioning and carbon allocation. We will: (Task 1) relate water use and storage to fluctuating environmental conditions to quantify hydrological limitations; (Task 2) attribute variability in water use and productivity to xylem architecture acclimation; and (Task 3) quantify tracheid functionality under contrasting drought regimes to advance mechanistic understanding of hydraulic failure.
D-STRESS-CH, situated at the Pfynwald Pinus sylvestris irrigation experiment, will capitalize upon a unique long-term, large-scale, and data rich framework and notably catch tree response when 10 years of irrigation end. The exceptional research setting and interdisciplinary approach will foster understanding of xylem functioning and limitation under drought. Congruent with the STReESS COST Action goals, D-STRESS-CH forms an ideal basis to improve eco-physiological models, promote participant exchange, and advances research forefronts aimed at quantifying impacts of climatic extremes.