@article{945b247e9e1b4346845c965d8b2fb0ac,
title = "Hydrological effects of tree invasion on a dry coastal Hawaiian ecosystem",
abstract = "In ecosystems invaded by non-native plants invasion effects are often spatially variable, and this variability is difficult to capture via plot-scale sampling. We used airborne high-resolution LiDAR (Light Detection and Ranging) to generate spatially explicit and contiguous information on hydrological effects of invasive trees (Prosopis pallida (Humb. & Bonpl. ex Willd.) Kunth). We developed regression relationships between LiDAR metrics (i.e., ground elevation and tree canopy height) and plot-scale measurements of vegetation stem water δ18O, to assess groundwater use, and transpiration rates. We used electrical resistivity imaging to assess subsurface geology and hydrology and their relationships to P. pallida stand structure. P. pallida biomass and transpiration varied greatly across the study area; both were controlled by depth to groundwater. Stem water δ18O values (-8.6 to 3.7‰) indicated a threshold ground elevation of ca. 15 m above sea level, above which P. pallida could not access groundwater; this threshold corresponded to declines in tree biomass and height. Transpiration modelled across the study area was 0.034 ± 0.017 mm day−1, but over 98% of transpiration came from the ca. 25% of the total study area where groundwater depths were less than 15 m. Our combination of methods offers a new way to incorporate fine-scale spatial variation into estimation of plant invasion effects on hydrology, increase our understanding of interactions of geology, hydrology, and biology in such invasions, and prioritise areas for control in well-advanced invasions.",
keywords = "Groundwater, Isoscape, LiDAR, Remote sensing, Retain, Riparian, Transpiration",
author = "Dudley, {B. D.} and Hughes, {R. F.} and Asner, {G. P.} and Baldwin, {J. A.} and Y. Miyazawa and H. Dulai and C. Waters and J. Bishop and Vaughn, {N. R.} and J. Yeh and S. Kettwich and MacKenzie, {R. M.} and R. Ostertag and T. Giambelluca",
note = "Funding Information: This research was supported by funding from NSF Hawai{\textquoteleft}i Experimental Program to Stimulate Competitive Research ( EPSCoR ) Grant Number EPS-0903833 , NSF REU 1005186 for student funds, and in-kind support from the USDA Forest Service Pacific Southwest Research Station. GAO data collection, processing and analysis were supported by the Gordon and Betty Moore Foundation and the Carnegie Institution for Science. The Global Airborne Observatory has been made possible by grants and donations to G.P. Asner from the Avatar Alliance Foundation , Margaret A. Cargill Foundation , David and Lucile Packard Foundation , Gordon and Betty Moore Foundation , Grantham Foundation for the Protection of the Environment , W. M. Keck Foundation , John D. and Catherine T. MacArthur Foundation , Andrew W. Mellon Foundation , Mary Anne Nyburg Baker and G. Leonard Baker Jr, and William R. Hearst III. We thank the community of Kīholo, particularly the MacDonald family and Jenny Mitchell for their support for this research. Hawai{\textquoteleft}i Department of Land and Natural Resources staff provided access to the Hawai{\textquoteleft}i Experimental Tropical Forest. The Pacific Internship Program for Exploring Science helped with coordination of student interns. J. VanDeMark, N. Wilhoite, J. Schulten, E. Parsons, M. Murphy, T. Gene, K. Matsuoka, J. Yeh, T. Sakihara, K. Nelson-Kaula, M. Riney, and T. Winthers-Barcelona assisted us greatly in the field. Appendix A Funding Information: This research was supported by funding from NSF Hawai?i Experimental Program to Stimulate Competitive Research (EPSCoR) Grant Number EPS-0903833, NSF REU 1005186 for student funds, and in-kind support from the USDA Forest Service Pacific Southwest Research Station. GAO data collection, processing and analysis were supported by the Gordon and Betty Moore Foundation and the Carnegie Institution for Science. The Global Airborne Observatory has been made possible by grants and donations to G.P. Asner from the Avatar Alliance Foundation, Margaret A. Cargill Foundation, David and Lucile Packard Foundation, Gordon and Betty Moore Foundation, Grantham Foundation for the Protection of the Environment, W. M. Keck Foundation, John D. and Catherine T. MacArthur Foundation, Andrew W. Mellon Foundation, Mary Anne Nyburg Baker and G. Leonard Baker Jr, and William R. Hearst III. We thank the community of K?holo, particularly the MacDonald family and Jenny Mitchell for their support for this research. Hawai?i Department of Land and Natural Resources staff provided access to the Hawai?i Experimental Tropical Forest. The Pacific Internship Program for Exploring Science helped with coordination of student interns. J. VanDeMark, N. Wilhoite, J. Schulten, E. Parsons, M. Murphy, T. Gene, K. Matsuoka, J. Yeh, T. Sakihara, K. Nelson-Kaula, M. Riney, and T. Winthers-Barcelona assisted us greatly in the field. Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",
year = "2020",
month = feb,
day = "15",
doi = "10.1016/j.foreco.2019.117653",
language = "English (US)",
volume = "458",
journal = "Forest Ecology and Management",
issn = "0378-1127",
publisher = "Elsevier",
}