This paper describes an ecological survey of the southernjarrah forest of Western Australia and provides an analysis of the data to det ermine site- vegetation types for use in stratification of the forest for management. The study area is described and compared with the northern jarrah forest where a similar site classification system is used for management. The methods and data analysis are outlined. Analysis was based on principal component analysis and correlation coefficients. The environmental conditions determing the site-vegetation types were interpreted using this analysis. Site moisture relations and drainage, and soil structure, development and fertility were the major influences determining site types. Their influence on forest structure and growth, dieback and regeneratin are discussed. Seventeen site types delineated from the ordination are described in Appendix III. Particular reference is made to regeneration, dieback and site productivity in the management of these site types.
