Homosoil, a Methodology for Quantitative Extrapolation of Soil Information Across the Globe
- 3.2k Downloads
In many places in the world, soil information is difficult to obtain and can be non-existent. When no detailed map or soil observation is available in a region of interest, we have to extrapolate from other parts of the world. This chapter will discuss the Homosoil method, which assumes homology of soil-forming factors between a reference area and the region of interest. This includes: climate, physiography, and parent materials. The approach will involve seeking the smallest taxonomic distance of the scorpan factors between the region of interest and other reference areas (with soil data) in the world. Using the digital information of soil climate from the Climate Research Unit (CRU) (solar radiation, rainfall, temperature, and evapo-transpiration), topography from the HYDRO1k (elevation, slope, and compound topographic index), and lithology of the world on a 0.5°× 0.5° grid, we calculated Gower’s similarity index between an area of interest and the rest of the world. The rules calibrated in the reference area can be applied in the region of interest realising its limitations and extrapolation consequences.
keywordsGlobal soil mapping Homoclime Climate Map extrapolation Soil forming factors
Unable to display preview. Download preview PDF.
- Adams, J.M., 1997. Global land environments since the last interglacial. Oak Ridge National Laboratory, TN, USA, http://www.esd.ornl.gov/ern/qen/nerc.html
- Durr, H.H., Meybeck, M., and Durr, S.H., 2005. Lithologic composition of the Earth’s continental surfaces derived from a new digital map emphasizing riverine material transfer. Global Biogeochemical Cycles 19, GB4S10.Google Scholar
- Jenny, H., 1941. Factors of Soil Formation. McGraw-Hill, New York, NY.Google Scholar
- Jones, P.G., Diaz, W., and Cock, J.H., 2005. Homologue, a computer system for identifying similar environments throughout the tropical world, version Beta a.0. Centro Internacional de Agricultura Tropical (CIAT), Cali, Colombia.Google Scholar
- McKenzie, N.J., Jacquier, D.W., Maschmedt, D.J., Griffin, E.A., and Brough, D.M., 2005. ASRIS Australian Soil Resource Information System. Technical specifications. Version 1.5. October 2005. Australian Collaborative Evaluation Program.Google Scholar
- Prescott, J.A., 1938. The climate of tropical Australia in relation to possible agricultural occupation. Transactions of the Royal Society of South Australia 62:229–240.Google Scholar
- Prescott, J.A., 1943. The Australian homoclime of the zone of natural occurrence of Parthenium argentatum. Transactions of the Royal Society of South Australia 67:312–318.Google Scholar
- Schultz, J., 2005. The Ecozones of the World: the Ecological Divisions of the Geosphere. Springer-Verlag, Stuttgart, Germany.Google Scholar
- Zinck, J.A., 1990. Soil Survey: Epistemology of a Vital Discipline. ITC, Enschede, the Netherlands.Google Scholar