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The long term impact of Acacia mearnsii trees on evaporation, streamflow, low flows and ground water resources. Phase II: Understanding the controlling environmental variables and soil water processes over a full crop rotation
Expanded Title:Internationally long-term catchment studies such as those conducted at the Two Streams research site including actual measurements of all the water balance components (some since 1999 to 2013) are scarce, while locally, this represents a unique study on the impact of an exotic tree plantation on catchment hydrological processes. Detailed measurements of total evaporation, streamflow, rainfall and groundwater were compiled to show a deficit in the water balance over the last seven years. Additional research was conducted on canopy and litter interception and stemflow contributions. During the most recent phase of work, isotope samples were collected using conventional automatic samples from the stream as well as newly developed rainfall samplers. In addition, techniques to extract isotope samples from the soil profile were improved, providing information on the water pathways through the catchment. Tree water-use measurements on different slope positions showed significant differences depending on distance from the river and aspect. These detailed process studies continue to enhance our understanding of the impacts of commercial forestry on the hydrological cycle providing invaluable information to support hydrological models and policy development within the water sector.
Date Published:01/03/2014
Document Type:Research Report
Document Subjects:Water Resource Management/IWRM - Hydrogeology
Document Keywords:Hydrology
Document Format:Image
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2022/1/13
ISBN No:978-1-4312-0516-5
Authors:Everson CS; Clulow AD; Becker M; Watson A; Ngubo C; Bulcock H; Mengistu M; Lorentz S; Demlie M
Project No:K5/2022
Organizations:Centre for Water Resources Research
Document Size:7 322 KB
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