Groundwater depth thresholds for tree condition
Presentation
Paper/Presentation Title | Groundwater depth thresholds for tree condition |
---|---|
Presentation Type | Presentation |
Authors | Kath, Jarrod (Author), Reardon-Smith, Kate (Author), Le Brocque, Andi (Author), Dafny, Elad (Author), Dyer, Fiona (Author), Fritz, L. (Author) and Batterham, Megan (Author) |
Journal or Proceedings Title | Proceedings of the 52nd Australian Society for Limnology Congress 2013 |
Year | 2013 |
Place of Publication | Canberra, Australia |
Web Address (URL) of Paper | http://asl-2013.p.asnevents.com.au/event/author/44737#/ |
Conference/Event | 52nd Australian Society for Limnology Congress (ASL 2013): From Theory to Practice in Water Science |
Event Details | 52nd Australian Society for Limnology Congress (ASL 2013): From Theory to Practice in Water Science Event Date 02 to end of 05 Dec 2013 Event Location Canberra, Australia |
Abstract | A range of ecological processes supported by groundwater are at risk where socio-economic and climate drivers increase net groundwater demand. Previous research has indicated close links between groundwater and riparian/floodplain tree condition. However, little is known about the nature of the relationship or whether critical groundwater-tree condition thresholds exist. Threshold responses may indicate the existence of groundwater depths associated with rapid ecological change. This study provides evidence of threshold responses between groundwater depth and tree condition in the Condamine catchment in eastern Australia, where groundwater decline due to over-extraction is well documented. It collates tree condition data (118 sites) from recent studies of two dominant Australian floodplain species, Eucalyptus camaldulensis Denh. (river red gum) and E. populnea F. Muell. (poplar box). Boosted regression trees and quantile regression were used to investigate the nature of the relationship and threshold values. A distinct non-linear response of tree condition to groundwater depth was identified, with thresholds identified at 12.5–17.2 m for E. camaldulensis and 15.6–22.0 m for E. populnea. Threshold responses may be explained in terms of physiological limitations to rooting depth in these and similar floodplain/riparian species, with groundwater decline effectively decoupling tree roots from accessible moisture resources leaving trees more vulnerable to hydraulic stress and/or failure particularly under drought conditions. The existence of thresholds suggest that groundwater decline may trigger rapid ecological changes in riparian and floodplain tree species, which may have important implications not only for their future persistence but also the various ecological functions they support. |
Keywords | canopy condition; dieback; drought; tipping point; ecological threshold; groundwater dependent ecosystems |
ANZSRC Field of Research 2020 | 300710. Tree nutrition and physiology |
300201. Agricultural hydrology | |
410206. Landscape ecology | |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Australian Centre for Sustainable Catchments |
International Centre for Applied Climate Science | |
National Centre for Engineering in Agriculture | |
University of Canberra |
https://research.usq.edu.au/item/q2v64/groundwater-depth-thresholds-for-tree-condition
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