Standardized National Vegetation Classification System Report
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USGS/NPS Vegetation Mapping Program Standardized National Vegetation Classification System - Final Draft Final Draft Standardized National Vegetation Classification System USGS/NPS Vegetation Mapping Program November 1994 Prepared for: United States Department of Interior United States Geological Survey and National Park Service Prepared By: The Nature Conservancy 1815 N. Lynn Street Arlington, Virginia 22209 Environmental Systems Research Institute 380 New York Street Redlands, California 92373 USGS/NPS Vegetation Mapping Program Standardized National Vegetation Classification System - Final Draft ESRI, ARC/INFO, PC ARC/INFO, ArcView, and ArcCAD are registered trademarks of Environmental Systems Research Institute, Inc. 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USGS/NPS Vegetation Mapping Program Standardized National Vegetation Classification System - Final Draft Table of Contents Section Page Executive Summary ...........................................................................................1-1 1.0 Introduction.................................................................................................1-4 1.1 Objectives of the Report ....................................................................................................1-4 1.1.1 Relationship to other reports in this series...............................................................1-5 1.2 Structure of the Report.......................................................................................................1-5 1.3 Terms of the Vegetation Mapping Project.........................................................................1-6 1.3.1 Project objectives.....................................................................................................1-6 1.3.2 Contract requirements..............................................................................................1-6 1.3.2.1 Classification System .....................................................................................1-6 1.3.2.2 Map Scale ......................................................................................................1-6 1.3.2.3 Map Accuracy ................................................................................................1-7 1.3.2.4 Digital Products.............................................................................................1-7 2.0 The Importance of a National Vegetation Classification Standard .......2-1 2.1 Applications of a Standard National Vegetation Classification System............................2-1 2.1.1 Facilitate regional and national resource assessments.............................................2-1 2.1.2 Advance scientific knowledge .................................................................................2-2 2.1.3 Support park planning and natural resources management .....................................2-2 2.1.4 Support ecosystem management initiatives ...................................................................2-2 2.2 Specifications/Requirement of a Candidate Standard ..............................................................2-3 3.0 Vegetation Classification: Background ........................................................ 3-1 3.1 What is Classification? ..............................................................................................................3-1 3.1.1 Community units and continua.......................................................................................3-1 Table of Contents November 1994 iii USGS/NPS Vegetation Mapping Program Standardized National Vegetation Classification System - Final Draft 3.2 Review of Different Approaches to Classification...................................................................3-2 3.2.1 Vegetation classifications................................................................................................3-2 3.2.1.1 Physiognomic Methods.........................................................................................3-2 3.2.1.2 Floristic Methods..................................................................................................3-4 3.2.1.3 Potential versus existing vegetation.....................................................................3-5 3.2.2 Site classifications ...........................................................................................................3-6 3.2.2.1 Site classifications emphasizing vegetation.........................................................3-6 3.2.2.2 Site classifications emphasizing multiple factors ...............................................3-7 3.2.3 Land cover classifications...............................................................................................3-8 3.2.4 Combined classification approaches ..............................................................................3-8 3.2.4.1 Physiognomic-Floristic Approaches....................................................................3-9 4.0 The Nature Conservancy's Vegetation Classification System .........................4-1 4.1 Approach of the Vegetation Classifiction System....................................................................4-1 4.1.1 Background......................................................................................................................4-1 4.1.2 Guiding principles ...........................................................................................................4-2 4.1.2.1 Appropriate for conservation planning and management ..................................4-2 4.1.2.2 Efficient use of existing information ....................................................................4-2 4.1.2.3 Flexible..................................................................................................................4-3 4.1.2.4 Emphasis on Natural and Semi-natural Vegetation............................................4-3 4.2 Development of the Nature Conservancy Classification System ............................................4-4 4.2.1 Identification of classification units................................................................................4-4 4.2.2 International Efforts ........................................................................................................4-5 4.2.3 Support from Federal and Academic Partners ...............................................................4-5 4.2.3.1 U.S. Geological Survey.........................................................................................4-6 4.2.3.2 United States Fish and Wildlife Service...............................................................4-6 4.2.3.3 United States Forest Service ................................................................................4-6 4.2.3.4 National Park Service...........................................................................................4-7 4.2.3.5 Environmental Protection Agency .......................................................................4-7 4.2.3.6 Inter-agency Groups.............................................................................................4-8 4.2.3.7 Academic Partners ...............................................................................................4-8 4.3 Tool and Methods that Support the Documentation and Development of the Classification..............................................................................................................................4-8 4.3.1 Field sampling .................................................................................................................4-8 4.3.2 Community descriptions ...............................................................................................4-10 Table of Contents November 1994 iv USGS/NPS Vegetation Mapping Program Standardized National Vegetation Classification System - Final Draft 4.3.2.1 Characterization variables and vegetation keys ...............................................4-10 4.3.2.2 Biological and Conservation Data System Community Records .....................4-11 4.3.3 Conservation Ranking...................................................................................................4-12 5.0 A Standard National Vegetation Classification System .............................. 5-1 5.1 Characteristics of the National Vegetation Classification System...........................................5-1 5.1.1 Based on