Stem radial growth and water storage responses to heat and drought vary between conifers with differing hydraulic strategies |
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| Authors: | Àngela Manrique‐Alba Sanna Sevanto Henry D Adams Adam D Collins Lee T Dickman Esteban Chirino Juan Bellot Nate G McDowell |
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| Affiliation: | 1. IMEM “Ramon Margalef”, University of Alicante, Alicante, Spain;2. Department of Ecology, University of Alicante, Alicante, Spain;3. Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA;4. Department of Plant Biology, Ecology, and Evolution, Oklahoma State University, Stillwater, OK, USA;5. Facultad de Ciencias Agropecuarias, Universidad Laica “Eloy Alfaro” de Manabí, Manta, Ecuador;6. Pacific Northwest National Laboratory, Richland, WA, USA |
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| Abstract: | We investigated stem radial growth and water storage dynamics of 2 conifer species differing in hydraulic carbon strategies, Juniperus monosperma and Pinus edulis, under conditions of ambient, drought (～45% reduction in precipitation), heat (～4.8 °C temperature increase), and the combination of drought + heat, in 2013 and 2014. Juniper maintained low growth across all treatments. Overall, the relatively isohydric piñon pine showed significantly greater growth and water storage recharge than the relatively anisohydric juniper across all treatments in the average climate year (2014) but no differences in the regionally dry year (2013). Piñon pine ceased growth at a constant predawn water potential across all treatments and at a less negative water potential threshold than juniper. Heat has a greater negative impact on piñon pines' growth and water storage than drought, whereas juniper was, in contrast, unaffected by heat but strongly impacted by drought. The whole‐plant hydraulic carbon strategies, in this case captured using the isohydric/anisohydric concept, translate into alternative growth and water storage strategies under drought and heat conditions. |
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| Keywords: | growth increased temperature Juniperus monosperma LVDT Pinus edulis water potential |
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