Skip to Main Content
Bark water uptake promotes localized hydraulic recovery in coastal redwood crownAuthor(s): J. Mason Earles; Or Sperling; Lucas C. R. Silva; Andrew J. McElrone; Craig R. Brodersen; Malcolm P. North; Maciej A. Zwieniecki
Source: Plant, Cell & Environment. 39(2): 320-328
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
Download Publication (1.0 MB)
DescriptionCoastal redwood (Sequoia sempervirens), the world’s tallest tree species, rehydrates leaves via foliar water uptake during fog/rain events. Here we examine if bark also permits water uptake in redwood branches, exploring potential flow mechanisms and biological significance. Using isotopic labelling and microCT imaging, we observed that water entered the xylem via bark and reduced tracheid embolization. Moreover, prolonged bark wetting (16 h) partially restored xylem hydraulic conductivity in isolated branch segments and whole branches. Partial hydraulic recovery coincided with an increase in branch water potential from about -5.5± 0.4 to -4.2± 0.3MPa, suggesting localized recovery and possibly hydraulic isolation. As bark water uptake rate correlated with xylem osmotic potential (R2 = 0.88), we suspect a symplastic role in transferring water from bark to xylem. Using historical weather data from typical redwood habitat, we estimated that bark and leaves are wet more than 1000 h per year on average, with over 30 events being sufficiently long (>24 h) to allow for bark-assisted hydraulic recovery. The capacity to uptake biologically meaningful volumes of water via bark and leaves for localized hydraulic recovery throughout the crown during rain/fog events might be physiologically advantageous, allowing for relatively constant transpiration.
- You may send email to email@example.com 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.
CitationEarles, J. Mason; Sperling, Or; Silva, Lucas C. R.; McElrone, Andrew J.; Brodersen, Craig R.; North, Malcolm P.; Zwieniecki, Maciej A. 2015. Bark water uptake promotes localized hydraulic recovery in coastal redwood crown. Plant, Cell & Environment. 39(2): 320-328
Keywordsembolism, fog, foliar uptake, phellem, sequoia sempervirens
- Decomposition and N cycling changes in redwood forests caused by sudden oak death
- Life cycle impacts of manufacturing redwood decking in Northern California
- Life-Cycle Inventory Analysis of Manufacturing Redwood Decking
XML: View XML