This United States Forest Service website depicts and describes the ecological subregions of California as defined by the National Hierarchical Framework of Ecological Units. The National Hierarchical Framework provides a scientific basis for regionalization of ecosystems into successively smaller, more homogeneous units. At the Section level, these units allow managers, planners, and scientists in the Forest Service to study management problems on a multiforest and statewide basis; organize data collected during broad-scale resource inventories; and interpret these data among regions. Sections, the highest hierarchical level in the subregion scale, are the basis for chapters in this text. Each section is described by the predominant environmental and biological features used in its delineation, along with other pertinent or characteristic factors. Information covered in section descriptions includes geomorphology, lithology, soil taxa, vegetation, fauna, disturbance regimes, land use, and cultural ecology. Maps are prevalent throughout the site, including a hyperlinked section map and numerous hyperlinked subsection maps. Appendices include a glossary, bibliography, and a chart of subsection acreages.
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