Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): J. Mason Earles; Jens T. Stevens; Or Sperling; Jessica Orozco; Malcolm P. North; Maciej A. Zwieniecki
    Date: 2018
    Source: New Phytologist
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (853.0 KB)

    Description

    • Rising temperatures and extended periods of drought compromise tree hydraulic and carbohydrate systems, threatening forest health globally. Despite winter's biological significance to many forests, the effects of warmer and dryer winters on tree hydraulic and carbohydrate status have largely been overlooked.
    • Here we report a sharp and previously unknown decline in stem water content of three conifer species during California's anomalous 2015 mid‐winter drought that was followed by dampened spring starch accumulation. Recent precipitation and seasonal vapor pressure deficit (VPD) anomaly, not absolute VPD, best predicted the hydraulic patterns observed.
    • By linking relative water content and hydraulic conductivity (Kh), we estimated that stand‐level Kh declined by 52% during California's 2015 mid‐winter drought, followed by a 50% reduction in spring starch accumulation. Further examination of tree increment records indicated a concurrent decline of growth with rising mid‐winter, but not summer, VPD anomaly.
    • Thus, our findings suggest a seasonality to tree hydraulic and carbohydrate declines, with consequences for annual growth rates, raising novel physiological and ecological questions about how rising winter temperatures will affect forest vitality as climate changes.

    Publication Notes

    • You may send email to psw_communications@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Earles, J. Mason; Stevens, Jens T.; Sperling, Or; Orozco, Jessica; North, Malcolm P.; Zwieniecki, Maciej A. 2018. Extreme mid-winter drought weakens tree hydraulic-carbohydrate systems and slows growth. New Phytologist. 219(1): 89-97. https://doi.org/10.1111/nph.15136.

    Cited

    Google Scholar

    Keywords

    climate change, drought, forest, hydraulics, stress, water, winter

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/57218