Quantifying the decline in transpiration of Tsuga Canadensis and predicting water budget implications of succession in southern Appalachian forests.Author(s): Joseph B. Davis
Source: Highlands Biological Station 8-22 p.
Publication Series: Miscellaneous Publication
PDF: View PDF (9.77 MB)
Eastern hemlock (Tsuga canadensis (L.) Carr.) is declining throughout the eastern
United States as a result of infestation of the hemlock woolly adelgid (HWA). As a principal species in riparian cove habitats in the southern Appalachians, its loss will have impact on the hydrologic budget in these systems. To estimate the impact on the hydrologic budget, we quantified transpiration over five years for T. canadensis, and over two years for co-occurring species Acer rubrum, Betula lenta, and Rhododendron maximum. Further, to understand the impacts of climate on transpiration, we compared transpiration to photosynthetically active radiation (PAR) and to vapor pressure deficit (VPD). Given the loss of T. canadensis from the ecosystem, we modeled implications on transpiration from two resulting succession scenarios, one in which R. maximum dominates, and one in which A. rubrum and B. lenta dominate. Transpiration was shown to decline since 2004 for T. canadensis, and no such decline was observed for the other species from 2006. The decline in transpiration was not shown to be a result of a changing climate conditions from the same study period. Using data from other studies, we modeled the succession of R. maximum following the loss of T. canadensis leaf area from the canopy. Also, we modeled the succession of A. rubrum and B. lenta resulting from a shift in sapwood area from T. canadensis to these species. Under both post-mortality scenarios, the transpiration component of the hydrologic budget increased. Although actual post-mortality scenarios are difficult to predict, the loss of T. canadensis will result in changes in the function of this ecosystem.
- 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.
CitationDavis, Joseph B. 2008. Quantifying the decline in transpiration of Tsuga Canadensis and predicting water budget implications of succession in southern Appalachian forests. Highlands Biological Station. 8-22 p.
- Future species composition will affect forest water use after loss of eastern hemlock from southern Appalachian forests
- Concentrations of Ca and Mg in early stages of sapwood decay in red spruce, eastern hemlock, red maple, and paper birch
- Vegetation composition and structure in two hemlock stands threatened by the hemlock woolly adelgid
XML: View XML