Abstract:

Whth the development of landscape ecology and the progress of land surveys, ecological land classification has been expanded to a world scale.The basic principle of ecological land classification is that land is regarded as a landscape interactive either among various land attributes or among various land elements.Ecological land classification is characterized by the divison of space entities in territory.As descending in hierarchy of classification, land unites in territory are divided into smaller and smaller areas.Now, in the world, the ecological land classification system tends to be multi-hierarchical and unified.Based on the case study of Xiejiahe drainage in Pingshan County, Hebei Province, a classification system is proposed to include three grades, namely, land system, land association and land type, simultaneously, to put forward the definition, division standards and nomenclature principles for each grade.In the studied region, 8 land systems have been classified.

Key words: Ecological land classification, Land system Land association, Land type,