Maintaining and Promoting the Ecological Role and the Value of Trees This book discuss the range of arboricultural concepts and practical techniques that are used by arborist to promote and maintain trees within a local ecosystem. This document is aimed primarily at practicing environmental arborist. Information on ecology, tree health, tree identification and traditional tree pruning techniques are contained in the relevant Minimum Industry Standards and supporting documents. This is one of a series of Minimum Industry Standards (MISs) produced by Arboriculture Australia Ltd in consultation with the national arboriculture community. These industry peer-reviewed standards cover the skills and equipment with which competent practitioners should be familiar.