Testing of a GIS model of Eucalyptus Iargiflorens health on a semiarid, saline floodplain
Identifieur interne : 000D95 ( Istex/Curation ); précédent : 000D94; suivant : 000D96Testing of a GIS model of Eucalyptus Iargiflorens health on a semiarid, saline floodplain
Auteurs : Peter J. Taylor [Australie] ; Glen R. Walker [Australie] ; Geoff Hodgson [Australie] ; Thomas J. Hatton [Australie] ; Ray L. Correll [Australie]Source :
- Environmental Management [ 0364-152X ] ; 1996-07-01.
Abstract
Abstract: Irrigated agriculture has resulted in substantial changes in water flows to the lower reaches of the River Murray. These changes have led to large-scale occurrences of dieback inEucalyptus largiflorens (black box) woodlands as well as increased inputs of salt to the river. Management options to address problems of this scale call for the use of spatial data sets via geographic information systems (GIS). A GIS exists for one floodplain of the River Murray at Chowilla, and a simple model predicted six health classes ofEucalyptus largiflorens based on groundwater salinity, flooding frequency, and groundwater depth. To determine the usefulness of the model for vegetation management, the quality of both the model and the GIS data sets were tested. Success of the testing procedure was judged by the degree of spatial matching between the model's predictions of health and that assessed from aerial photographs and by field truthing. Analyses at 80 sites showed that tree health was significantly greater where groundwater salinity was less than 40 dS/m or flooding occurred more frequently than 1 in 10 years or depth to groundwater exceeded 4 m. Testing of the GIS data sets found that vegetation was misclassified at 15% of sites. Association was shown between GIS-predicted values and field-truthed values of groundwater salinity but not groundwater depth. The GIS model of health is a useful starting point for future vegetation management and can be further improved by increasing the quality of the data coverages and further refining of the model to optimize parameters and thresholds.
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DOI: 10.1007/BF01474655
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Walker</name><affiliation wicri:level="1"><mods:affiliation>CSIRO Division of Water Resources, PMB 2, 5064, Glen Osmond, SA, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>CSIRO Division of Water Resources, PMB 2, 5064, Glen Osmond, SA</wicri:regionArea></affiliation></author><author><name sortKey="Hodgson, Geoff" sort="Hodgson, Geoff" uniqKey="Hodgson G" first="Geoff" last="Hodgson">Geoff Hodgson</name><affiliation wicri:level="1"><mods:affiliation>CSIRO Division of Water Resources, GPO Box 1666, 2601, Canberra, ACT, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>CSIRO Division of Water Resources, GPO Box 1666, 2601, Canberra, ACT</wicri:regionArea></affiliation></author><author><name sortKey="Hatton, Thomas J" sort="Hatton, Thomas J" uniqKey="Hatton T" first="Thomas J." last="Hatton">Thomas J. Hatton</name><affiliation wicri:level="1"><mods:affiliation>CSIRO Division of Water Resources, GPO Box 1666, 2601, Canberra, ACT, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>CSIRO Division of Water Resources, GPO Box 1666, 2601, Canberra, ACT</wicri:regionArea></affiliation></author><author><name sortKey="Correll, Ray L" sort="Correll, Ray L" uniqKey="Correll R" first="Ray L." last="Correll">Ray L. 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Hatton</name><affiliation wicri:level="1"><mods:affiliation>CSIRO Division of Water Resources, GPO Box 1666, 2601, Canberra, ACT, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>CSIRO Division of Water Resources, GPO Box 1666, 2601, Canberra, ACT</wicri:regionArea></affiliation></author><author><name sortKey="Correll, Ray L" sort="Correll, Ray L" uniqKey="Correll R" first="Ray L." last="Correll">Ray L. 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These changes have led to large-scale occurrences of dieback inEucalyptus largiflorens (black box) woodlands as well as increased inputs of salt to the river. Management options to address problems of this scale call for the use of spatial data sets via geographic information systems (GIS). A GIS exists for one floodplain of the River Murray at Chowilla, and a simple model predicted six health classes ofEucalyptus largiflorens based on groundwater salinity, flooding frequency, and groundwater depth. To determine the usefulness of the model for vegetation management, the quality of both the model and the GIS data sets were tested. Success of the testing procedure was judged by the degree of spatial matching between the model's predictions of health and that assessed from aerial photographs and by field truthing. Analyses at 80 sites showed that tree health was significantly greater where groundwater salinity was less than 40 dS/m or flooding occurred more frequently than 1 in 10 years or depth to groundwater exceeded 4 m. Testing of the GIS data sets found that vegetation was misclassified at 15% of sites. Association was shown between GIS-predicted values and field-truthed values of groundwater salinity but not groundwater depth. The GIS model of health is a useful starting point for future vegetation management and can be further improved by increasing the quality of the data coverages and further refining of the model to optimize parameters and thresholds.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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