Regional-scale models for relating land cover to basin surface-water quality using remotely sensed data in a GIS
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Plant-based management systems implementing deep-rooted, perennial vegetation have been identified as important in mitigating the spread of secondary dryland salinity due to its capacity to influence water table depth. The Glenelg Hopkins catchment is a highly modified watershed in the southwest region of Victoria, where dryland salinity management has been identified as a priority. Empirical relationships between the proportion of native vegetation and in-stream salinity were examined in the Glenelg Hopkins catchment using a linear regression approach. Whilst investigations of these relationships are not unique, this is the first comprehensive attempt to establish a link between land use and in-stream salinity in the study area. The results indicate that higher percentage land cover with native vegetation was negatively correlated with elevated in-stream salinity. This inverse correlation was consistent across the 3 years examined (1980, 1995, and 2002). Recognising the potential for erroneously inferring causal relationships, the methodology outlined here was both a time and cost-effective tool to inform management strategies at a regional scale, particularly in areas where processes may be operating at scales not easily addressed with on-site studies.
KeywordsDryland salinity Land use Native vegetation Regional analysis Southwest Victoria Australia
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- Dahlhaus, P. G., Heislers, D., & Dyson, P. (2002). Groundwater flow systems of the Glenelg Hopkins catchment management authority region, Rep. No. GHCMA 02/02. Buninyong, Australia: Dahlhaus Environmental Geology Pty Ltd.Google Scholar
- Dahlhaus, P. G., & MacEwan, R. J. (1997). Dryland salinity in south west Victoria: Challenging the myth. In G. McNally (Ed.), Collected case studies in engineering geology, hydrogeology and environmental geology. Environmental, Engineering and Hydrogeology Specialist Group (EEHSG) of the Geological Society of Australia and Conference Publications.Google Scholar
- Dixon, P. R. (2000) Environmental monitoring in the Glenelg-Hopkins Region with reference to salinity in wetlands and remnant vegetation sites. Melbourne, Australia: Department of Natural Resources and Environment.Google Scholar
- Field, A. (2000). Regression. In discovering statistics using SPSS for windows (p. 496). London, England: Sage Publications.Google Scholar
- GHCMA (1997) Glenelg Hopkins Regional Catchment Strategy. Hamilton, Australia: Glenelg Hopkins Catchment Management Authority.Google Scholar
- GHCMA (2002) Glenelg Hopkins Regional Catchment Strategy 2003–2007. Hamilton, Australia: Glenelg Hopkins Catchment Management Authority.Google Scholar
- GHCMA (2003) Glenelg Hopkins regional catchment strategy: 2003–2007. Hamilton, Australia: Glenelg Hopkins Catchment Management Authority.Google Scholar
- GHCMA (2005) Glenelg Hopkins Salinity Plan 2005–2008. Hamilton, Victoria: Glenelg Hopkins Catchment Management Authority.Google Scholar
- Kleinbaum, D. G., Kupper, L. L., & Muller, K. E. (1988) Applied regression analysis and other multivariable methods (2nd ed.). Boston, MA, USA: PWS-Kent Pub. Co.Google Scholar
- Legendre, P. (2001) Model II regression – User’s guide. Departement de sciences biologiques, Universite de Montreal. Available from http://www.fas.umontreal.ca/biol/legendre.
- Maidment, D., & Djokic, D. (2002) Hydrologic and hydraulic modelling support. New York, USA: ESRI Press.Google Scholar
- National Land and Water Resources Audit (2001) Australian dryland salinity assessment 2000: Extent, impacts, processes, monitoring and management options. Turner, ACT: National Land and Water Resources Audit.Google Scholar
- Pretty, J. L., Harrison, S. S. C., Shepherd, D. J., Smith, C., Hildrew, A. G., & Hey, R. D. (2003) River rehabilitation and fish populations: Assessing the benefit of instream structures. Journal of Applied Ecology, 40, 251–265.Google Scholar
- Raleigh, R., & Dixon, P. (2005) Environmental monitoring in the Glenelg-Hopkins Region with reference to salinity in wetlands, groundwater and remnant vegetation sites. Hamilton, Australia: Department of Primary Industries.Google Scholar
- Smith, W. E., & Nathan, E. (1998). Victorian water quality monitoring network trend analysis: Glenelg catchment management authority area. Melbourne, Australia: Department of Natural Resources.Google Scholar
- Sokal, R. R., & Rohlf, F. J. (1995) Biometry: The principles and practice of statistics in biological research (3rd ed.). New York: W.H. Freeman.Google Scholar
- Van Bueren, M., & Price, R. J. (2004) Breaking ground: key findings from 10 years of Australia’s national dryland salinity program land and water resources research and development corporation (Australia). Canberra, ACT.Google Scholar
- Versace, V. L., Ierodiaconou, D., Stagnitti, F., Leblanc, M., March, T., & Salzman, S. (2005). Multivariate modelling of the influence of land use on in-stream salinity over multiple spatial scales. In M. De Conceicao Cuhna & C. A. Brebbia (Eds.), Water resources management III. Wessex Institute of Technology.Google Scholar
- Wood, W. E. (1924) Increase in salt in soil and streams following the destruction of native vegetation. Journal and Proceedings of the Royal Society of Western Australia, 10, 35–47.Google Scholar