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- W244231714 abstract "In ephemeral river systems, canopy condition in dominantriparian and floodplain tree species may depend on accessto shallow groundwater resources, particularly duringdrought. However, unsustainable groundwater extraction andchronic groundwater decline, evident in many agriculturallandscapes worldwide, effectively decouples tree roots fromdeep soil moisture resources, increasing the susceptibilityof trees to changes in precipitation.In such regions, drought may trigger loss of canopycondition and have long term consequences for the functionand survival of trees and the composition, structure andfunction of ecosystems they dominate. However, critical groundwater depth thresholds have been difficult to identify.This study used a novel approach including boosted regression trees, quantile regression and thresholdanalysis to explore the relationship between groundwaterdepth and tree condition for two dominant tree species,Eucalyptus camaldulensis (river red gum) and E. populnea(poplar box); both species occur on the Upper Condaminefloodplain, a region experiencing groundwater depthdeclines of 25+m in the northern Murray-‐Darling Basin,southern Queensland.Distinct non-‐linear responses were apparent, with minimumgroundwater depth thresholds identified at 12.1m for E.camaldulensis and 12.6m for E.populnea, beyond which canopycondition declined significantly.This approach represents a repeatable method of quantifyingecological response thresholds along groundwater depthgradients. Its application may enable safe operating limits for groundwater resource management to be identified, supporting improved decision making to support resilient floodplain ecosystems.This will be particularly important in regions wheregroundwater decline driven by increasing water demand anddrying climates is predicted." @default.
- W244231714 created "2016-06-24" @default.
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- W244231714 date "2014-10-01" @default.
- W244231714 modified "2023-09-26" @default.
- W244231714 title "Groundwater thresholds for drought resilience in floodplain woodlands: a case study from the northern Murray-Darling Basin" @default.
- W244231714 hasPublicationYear "2014" @default.
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