The hydrological and ecological consequences of rapid changes in climate and the global hydrological cycle are staggering. Widepsread and severe drought, massive mortaility of forests, and declining water available for growing food and producing fibre are just some of the consequences. We seek mechanistic understanding of these dynamics by looking through the lens of plant hydraulics, which describes water flow from the soil to the atmosphere through plant xylem, and in turn is a vital pathway for nutrient, carbon, and energy exchanges. We examine these mechanisms by combining empiricism, mathematical models, and data analytics.
Here are five related products:
Mackay, D.S., D.E. Roberts, B.E. Ewers, J.S. Sperry, N.G. McDowell, and W.T. Pockman. 2015. Interdependence of chronic hydraulic dysfunction and canopy processes can improve integrated models of tree response to drought. Water Resources Research, 51(8), 6156-6176, doi:10.1002/2015WR017244.
McDowell, N.G., A.P. Williams, C. Xu, W.T. Pockman, L.T. Dickman, S. Sevanto, R. Rangle, J. Limousin, J. Plaut, D.S. Mackay, J. Ogee, J.C. Domec, C.D. Allen, R.A. Fisher, X. Jiang, J.D. Muss, D.D. Breshears, S.A. Rauscher, and C. Koven. 2015. Multi-scale predictions of massive conifer mortality due to chronic temperature rise. Nature Climate Change, doi:10.1038/nclimate2873, Published online 21 December 2015.
Mackay, D.S., B.E. Ewers, M.M. Loranty, E.L. Kruger, and S. Samanta. 2012. Bayesian analysis of canopy transpiration models: A test of posterior parameter means against measurements. Journal of Hydrology, 432-433, 75-83, doi: 10.1016/j.hydrol.2012.02.019.
Mackay, D.S., B.E. Ewers, M.M. Loranty, and E.L. Kruger. 2010. On the representativeness of plot size and location for scaling transpiration from trees to a stand. Journal of Geophysical Research - Biogeosciences, 115, G02016, doi:1029/2009JG001092.
Ewers, B.E., D.S. Mackay, and S. Samanta. 2007. Interannual consistency in canopy stomatal conductance control of leaf water potential across seven tree species. Tree Physiology, 27, 11-24.
Here are our current projects (with NSF funding):
> Collaborative research: Integrating plant hydraulics with climate and hydrology to understand and predict responses to climate change
> A systems analysis of plant growth promotion by the rhizosphere microbiome
> Improving hydrologic representation in earth systems modeling (see Hydrologic Process Team)
Here are some relevant links:
Graduate Program in Evolution, Ecology, & Behavior
Center for Geographic Information and Analysis (NCGIA)
Ecosystem Restoration through Interdisciplinary Exchange (ERIE)
Consortium of Universities for the Advancement of Hydrologic Science (CUAHSI)
Ecosystem-Atmosphere Study (ChEAS)
Susquehanna Shale Hills Critical Zone Observatory (SSHCZO)
American Carbon Program (NACP)
Web of Science ID
Google Scholar Profile