The Aussie GRASS project
The project
The first stage of the project was completed in 1996 and used Queensland as a case study to integrate climate and natural resource data, remote sensing, historical agronomic research and simulation modelling. While seasonal rainfall explained only 40% of the variation in seasonal pasture growth, models of soil water and pasture growth could explain 50-70% of observed variation. The simulation work involved running a pasture growth model for tropical and sub-tropical grasses (GRASP) on a 5 km grid over the entire State, calibrated for a broad range of pasture communities, soil types and climatic conditions.
1. Simulating pasture growth
Three other models, along with GRASP, (WA's IMAGES, and CSIRO's ARIDGRO and SEE-SAW) were examined to compare how they simulate the important processes of the semi-arid southern Australian pasture systems, GRASP was then compared to CSIRO's GRASSGRO model. The GRASP model was also calibrated for use in the Northern Territory and Kimberley rangeland.
2. Data
Collaborating parties continue to work to improve the vast number of biophysical data sets associated with the project (rainfall, temperature, humidity, radiation, domestic stock density macropods, ferals, soils, pasture type and tree cover).
3. Extension
Products from the operational Queensland spatial model were the basis for developing Aussie GRASS products in consultation with clients. Such products are used in information systems, and their promotion is integrated into other extension activities. Training of extension staff was an important component of AussieGRASS.
Aussie GRASS agency links
Last updated: 19 February 2010