Lack of acclimation of leaf area:sapwood area ratios in piñon pine and juniper in response to precipitation reduction and warming

McBranch, Natalie A.; Grossiord, Charlotte; Adams, Henry; Borrego, Isaac; Collins, Adam D.; Dickman, Turin; Ryan, Max; Sevanto, Sanna; McDowell, Nate G.

doi:10.1093/treephys/tpy066

Title: Lack of acclimation of leaf area:sapwood area ratios in piñon pine and juniper in response to precipitation reduction and warming

Journal Article · 28 September 2018 · Tree Physiology (Online)

DOI: https://doi.org/10.1093/treephys/tpy066 · OSTI ID:1477700

McBranch, Natalie A. ^[1];

^[1]; Adams, Henry ^[2]; Borrego, Isaac ^[1]; Collins, Adam D. ^[1]; Dickman, Turin ^[1]; Ryan, Max ^[1]; Sevanto, Sanna ^[1]; McDowell, Nate G. ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Oklahoma State Univ., Stillwater, OK (United States). Dept. of Plant Biology, Ecology, and Evolution
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Earth Systems Science Division

The leaf area to sapwood area ratios of trees (A_l:A_S) can shift to maintain homeostatic gas exchange per unit leaf area in response to climate variability. Here, we tested the hypothesis that trees alter their A_l:A_S ratios in response to long-term warming and reduced precipitation in order to maintain leaf-specific gas exchange rates under more stressful conditions. Whole-tree A_l:A_S was measured on mature piñon pine (Pinus edulis Engelm.) and one-seed juniper (Juniperus monosperma (Engelm.) Sarg.) trees after 5 years (2012–16) of chronic exposure to increased temperature (+4.8 °C), precipitation reduction (-45%), or both simultaneously. No difference was found in A_l:A_s among treatments for either species. Associated with this lack of shift in A_l:A_s were large changes in pre-dawn leaf water potential and stomatal conductance, consistent with theoretical expectations of interactions between leaf and whole-tree hydraulic supply. Finally, our results suggest that a lack of whole-tree acclimation in A_l:A_s results in the reductions in plant gas exchange and water status associated with long-term warming and reduced precipitation in semi-arid woodlands.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: PNNL Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)

Grant/Contract Number:: AC05-76RL01830; AC52-06NA25396

OSTI ID:: 1477700

Report Number(s):: LA-UR--18-24644; PNNL-SA-139888

Journal Information:: Tree Physiology (Online), Journal Name: Tree Physiology (Online) Journal Issue: 1 Vol. 39; ISSN 1758-4469

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Lack of acclimation of leaf area:sapwood area ratios in piñon pine and juniper in response to precipitation reduction and warming

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