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