Simulation of water-limited growth of the forage shrub saltbush (Atriplex nummularia Lindl.) in a low-rainfall environment of southern Australia

K. Descheemaeker, A. P. Smith, M. J. Robertson, A. M. Whitbread, N. I. Huth, W. Davoren, J. Emms, R. Llewellyn
2014 Crop and Pasture Science  
This paper presents an approach to mapping landforms within the Victorian Mallee, a landscape primarily moulded by aeolian processes. The approach combines a variety of spatial modelling techniques based on an assessment of their ability to map target landform components identified within existing broad-scale land systems of the region. Expert knowledge of the distribution and topographic profile of these landforms, as described by Rowan and Downes (1963) , has guided the approach. The success
more » ... f individual modelling techniques in predicting target landforms is largely dependent upon the topography and relief of the landscape. Combining outputs from the various spatial modelling techniques, including rule-sets to combine DEM derivative surfaces (such as relative elevation, aspect, slope and curvature), the FLAG, Fuzzy Landscape Analysis GIS, model and MrVBF, Multi-resolution Valley Bottom Floor, index has proven reliable in the delineation of various landform components in the Central Mallee and Hopetoun land systems. A statistical validation undertaken to assess the quality of model outputs showed an accuracy of 84% was achieved for seven of the ten landform components (comprising 97% of the study area). An increase in the resolution of landform mapping resulting from this work will: improve the accuracy and precision of modelling; monitor land degradation with greater certainty and provide a valuable input into the creation of digital soil maps through soil inference systems.
doi:10.1071/cp13452 fatcat:ibjxmu2bk5br3jzwizh3i44wfq