Skip to main content
U.S. flag

An official website of the United States government

Eastern hemlock transpiration: patterns, controls, and implications for its decline in southern Appalachian forests

Year:

2006

Publication type:

Scientific Journal (JRNL)

Primary Station(s):

Southern Research Station

Source:

In: Second interagency conference on research in the watersheds, May 16-18, 2006. 7 p.

Description

Eastern hemlock, a principal riparian and cove canopy species in the southern Appalachian mountains, is facing potential widespread mortality due to the hemlock adelgid (HWA). To estimate the impact that the loss of this species will have on forest transpiration (E1) we quantified whole-tree (Ec) and leaf-level (E1) transpiration over a range of tree sizes (9.5 - 67.5 cm or 3.7 - 26.6 in) during 2004 and 2005. Maximum rates of Ec varied by a diameter, with large tree transpiring a maximum of 186 kg (or 49 gal) water tree-1 day-1. Large trees had higher maximum rates of instantaneous El compared to small trees (1.99 versus 1.54 mmol m-2s-1). with increasing HWA infestation, regardless of leaf area, trees are expected to have declining transpiration rates. Hemlock mortality could reduce annual- and winter-spring E1 by 10 and 30 percent, respectively. The lack of an evergreen riparian canopy species will alter the dynamics of E1 and stream discharge.

Citation

Ford, Chelcy R.; Vose, James M. 2006. Eastern hemlock transpiration: patterns, controls, and implications for its decline in southern Appalachian forests. In: Second interagency conference on research in the watersheds, May 16-18, 2006. 7 p.

Publication Notes

  • 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.
https://www.fs.usda.gov/treesearch/pubs/28998