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Biological and Environmental Research (BER) (SC-23) OSTI Identifier: 1378919 Report Number(s): LA-UR-17-22377 Journal ID: ISSN 0140-7791 Grant/Contract Number: AC52-06NA25396 Resource Type: Accepted Manuscript Journal Name: Plant, Cell and Environment Additional Journal Information: Journal Volume: 40 Journal Issue: 9 Journal ID: ISSN 0140-7791 Publisher: Wiley Country of Publication: United States Language: English Subject: 54 ENVIRONMENTAL SCIENCES 60 APPLIED LIFE SCIENCES acclimation, hydraulics, Juniperus monosperma, megadrought, Pinus edulis, sap flux, transpiration, stomatal conductance, vapor pressure deficit, xylem = ,ĭisentangling the relative impacts of precipitation reduction and vapour pressure deficit (VPD) on plant water dynamics and determining whether acclimation may influence these patterns in the future is an important challenge. (LANL), Los Alamos, NM (United States) Sponsoring Org.: USDOE Office of Science (SC). Publication Date: Fri May 26 00:00: Research Org.: Los Alamos National Lab. of New Mexico, Albuquerque, NM (United States) Here our results show that stomatal conductance adjustments to high VPD could minimize but not entirely prevent additive effects of warming and drying on water use and carbon acquisition of trees in semi-arid regions. Although reduced stomatal sensitivity to VPD also occurred under combined stresses, reductions in G s, F D and K L took place to similar levels as under single stresses for both species. For juniper, reduced soil moisture under warming negated benefits of stomatal adjustments and resulted in reduced F D, G s and K L. Warming reduced the sensibility of stomata to VPD for both species but resulted in the maintenance of G s and F D to ambient levels only for piñon. No acclimation occurred under precipitation reduction: lower G s and F D were found for both species compared to ambient conditions. Here, we report sap flux density ( F D), stomatal conductance ( G s), hydraulic conductivity ( K L) and xylem anatomy in piñon pine ( Pinus edulis) and juniper ( Juniperus monosperma) trees subjected to five years of precipitation reduction, atmospheric warming (elevated VPD) and their combined effects. Disentangling the relative impacts of precipitation reduction and vapour pressure deficit ( VPD) on plant water dynamics and determining whether acclimation may influence these patterns in the future is an important challenge.