Breaking Barriers Building Bridges: - ERI Library - Northern Arizona ...

211Stratification system: A methodology of site analysis that structuresdata into appropriate layers or strata of information (e.g., GeographicInformation Systems).Stratum/Strata: Stratum indicates a single layer of data within a stratificationsystem or Geographic Information System; strata indicate twoor more layers of data within such a system.Thinning: The silvicultural practice of removing selected trees in astand to reduce competition for light, water, and nutrients in order topromote the growth and survival of the remaining trees.Threshold: The point at which there is an abrupt change in an ecosystemquality, property or phenomenon, or where small changes in anenvironmental driver produce large responses in the ecosystem.Tiering: A process used by federal agencies when developing an EISthat focuses on issues which are ready for a decision, and places thosethat have already been decided or are not ready for a decision in alower level of consideration (see CEQ NEPA Regulations 40 CFR1508.28).Treatment: This term describes any of a set of management activitiesthat can assist the prompt recovery of forestlands. Management actionsinclude any combination of live, dead, and dying wood removal, ordisposal (with or without commercial value) by any feasible method,including but not limited to logging, piling, masticating, and burning,for site preparation. In addition, planting, seeding, and monitoring fornatural regeneration without site preparation are appropriate managementactivities designed to foster the prompt recovery following wildfire.Treatments also include follow-up activities to control vegetationthat competes with desired trees during the early establishment period,usually 1 to 5 years after establishment using any viable method thatmeets Land and Resource Management Plan direction.