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21st-century droughts are different: Increasing radial growth in old-growth high-elevation conifers in southern California, USA during the exceptional “hot drought” of 2000–2020
Abstract:
<p>Hot droughts, droughts attributed to below-average precipitation and exceptional warmth are increasingly common in the 21<sup>st</sup> century, yet little is known about their effect on coniferous tree growth because of their rarity. Here, we document radial growth responses of high-elevation old-growth conifers (Jeffrey pine, sugar pine, lodgepole pine) in the San Jacinto Mountains, California during a 21st-century hot drought (2000–2020, + 12%) and a 20th-century drought (1959–1966, -18%) driven by precipitation deficits. Radial growth of the three species we examined is principally affected by warmer annual minimum temperatures and secondarily by above-average annual precipitation. Because of this climate-growth response, we found that these species experienced increased radial growth during the extended hot drought of 2000–2020 as increases in temperature were more critical to growth than decreases in precipitation. The exceptions to this were during 2002 and 2007, suggesting that there are limitations to above-average growth during hot droughts, but only during the most extreme drought conditions. These results illustrate that the consequences of environmental stress on radial growth, even during exceptional events, exhibit spatiotemporal variability.</p>
Keywords: Hot drought, Sugar pine, Jeffrey pine, Lodgepole pine, San Jacinto Mountains.
Authors:
Paul Knapp, University of North Carolina Greensboro; Submitting Author / Primary Presenter
Peter Soule', Appalachian State University; Co-Author (this author will not present)
Tyler Mitchell, University of North Carolina Greensboro; Co-Author (this author will not present)
Avery Catherwood, University of North Carolina Greensboro; Co-Author (this author will not present)
Hunter Lewis, {SubmissionForm.presentersAuthors/affiliation#4}; Co-Author (this author will not present)
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21st-century droughts are different: Increasing radial growth in old-growth high-elevation conifers in southern California, USA during the exceptional “hot drought” of 2000–2020
Category
In-Person Paper Abstract