Beginning with the Resources Planning Act of 1974 (Public Law 93–378), several pieces of legislation require federal land-management agencies to inventory the renewable resources of the nation. Data from the inventory must accurately describe the current conditions, present and potential production levels, and current and prospective use of the individual resources. Data collected in the inventory provide estimates of such information as volume of timber, pounds of available forage, plant species composition, soil depth, wildlife and fish habitat characteristics, land ownership, and land descriptors, such as slope, aspect, and topography. The information that describes current condition and productive potential of each resource is needed to evaluate alternative management strategies with respect to cost, returns, and changes in production.
KeywordsLand Unit Ecological Unit Ecological Land Spatial Hierarchy Ecosystem Concept
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