Ecological Site Description Development Resources

Ecological sites comprise a land classification system that describes ecological potential and ecosystem dynamics of land areas. They are used to stratify the landscape and organize ecological information for purposes of monitoring, assessment, and management.

This page provides some definitions for ecological site descriptions (ESDs) and provides tools and literature pertaining to their development. A comprehensive guidance document for ESD development for the United States is being produced via cooperation of responsible federal agencies and is an active area of research at the Jornada Experimental Range. There are many ways ESD concepts can be developed and applied outside of the United States.

What is an ecological site?

An ecological site is distinctive kind of land with specific soil and physical characteristics that differs from other kinds of land in its ability to produce distinctive kinds and amounts of vegetation, and in its ability to respond similarly to management actions and natural disturbances. Unlike vegetation classification, ecological site classification uses climate, soil, geomorphology, hydrology, and vegetation information to describe the ecological potential of land areas. A particular ecological site may feature several plant communities (described by vegetation classification) that occur over time and/or in response to management actions.

What is an ecological site description?

Ecological site descriptions (ESDs) are reports that describe the a) biophysical properties of ecological sites, b) vegetation and surface soil properties of reference conditions that represent either i) pre-European vegetation and historical range of variation (in the United States) or ii) proper functioning condition or potential natural vegetation, c) state-and-transition model graphics and text, and d) a description of ecosystem services provided by the ecological site and other interpretations.

How are ecological sites mapped for use?

In the United States, ecological sites are connected to spatial data via soil map units of the National Cooperative Soil Survey. Classification of land areas to ecological sites can be easily visualized via Web Soil Survey of the USDA Natural Resources Conservation Service or within a personal GIS via SSURGO digital soil data. Ecological sites are linked to one or more map unit components of one or more soil map units. A soil map unit may have several map unit components that cannot be mapped separately (because they are finely intermingled, for example), so soil map unit polygons may not correspond in a 1:1 fashion with ecological sites. For SSURGO spatial data, map unit components can be connected to ecological site descriptions in a database by linking the map unit component to the ecological site class name in cecoclas.txt table and then to the map unit in the mapunit.txt via the comp.txt table (see figure below).

How are ecological sites used?

ESDs and associated information are used primarily to stratify the landscape for monitoring and assessment, interpretation of resource hazards and opportunities, and to prioritize and select management actions. ESDs are developed and housed by the NRCS and its partners, and used by the U. S. Bureau of Land Management (BLM), the The Nature Conservancy, and many other entities. A recent memorandum of understanding between the NRCS, BLM, and U.S. Forest Service establishes ESD development as an interagency priority and will establish national standards and protocols for ESD development.

What is a state-and-transition model?

The patterns, causes, and indicators of transitions between communities within an ecological site are described by state-and-transition models. State-and-transition models synthesize literature and informal knowledge tied to particular ecological sites to distinguish changes in vegetation and soils that are easily reversible versus changes that are subject to thresholds beyond which reversal is costly or impossible. The models describe all possible states, community phases (i.e., easily-reversible variants of states), and transitions between communities and states. Transitions contain information about mechanisms, triggers, thresholds, and indicators of threshold development.

Ecological Site Description Access

• General
• New Mexico
• Arizona
• Colorado
• Utah
• Oklahoma
• Texas

Ecological Site Development Resources

Data forms for ESD development:

• Low Intensity traverse
• Medium Intensity plant inventory
• High Intensity plant inventory
  • Production(optional)
• Soil characterization
• Pedoderm and pattern classes

Rangeland/ESD development database (MS Access)
WARNING: ESD data forms have recently been updated (12/19/2008). These updates have not yet been incorporated to the database.

Monitoring and Assessment resources(also contains dataforms)

PRISM climate data

National and International Vegetation Classificationand data access

NRCS Soil Data Mart

Ecological Site Description Literature

1. Bestelmeyer, B.T., J.R. Brown, K.M. Havstad, G. Chavez, and R. Alexander, and J.E. Herrick. 2003. Development and use of state-and-transition models for rangelands. Journal of Range Management 56: 114-126.
2. Bestelmeyer, B.T., J.E. Herrick, J.R. Brown, D.A. Trujillo, K.M. Havstad. 2004. Land management in the American Southwest: a state-and-transition approach to ecosystem complexity. Environmental Management 34: 38-51.
3. Bestelmeyer, B. T., D. A. Trujillo, A. J. Tugel, and K. M. Havstad. 2006. A multi-scale classification of vegetation dynamics in arid lands: what is the right scale for models, monitoring, and restoration?Journal of Arid Environments 65: 296-318.
4. Brown, J. R., T. Svejcar, M. Brunson, J. Dobrowolski, E. Fredrickson, U. Krueter, K. Launchbaugh, J. Southworth and T. Thurow. 2002. Range Sites: Are they the appropriate spatial unit for measuring and managing rangelands?Rangelands 24: 7-12.
5. Briske, D. D., S. D. Fuhlendorf, and F. E. Smeins. 2005. State-and-transition models, thresholds, and rangeland health: a synthesis of ecological concepts and perspectives. Rangeland Ecology and Management 58:1-10.
6. Briske, D. D., S. D. Fuhlendorf and F. E. Smeins. 2006. A unified framework for assessment and application of ecological thresholds. Rangeland Ecology and Management 59:225-236.
7. Creque, J. A., S. D. Bassett, and N. E. West. 1999. Viewpoint: Delineating ecological sites.Journal of Range Management 52: 546-549.
8. Dyksterhuis, E. J. 1949. Condition and management of rangeland based on quantitative ecology. Journal of Range Management 2: 104-115.
9. Dyksterhuis, E.J. Ecological Principles in Range Evaluation. 1958, Botanical Review, 24:253-272.
10. Herrick, J. E., B. T. Bestelmeyer, S. R. Archer, A. J. Tugel, and J. R. Brown. 2006. An integrated framework for science-based arid land management. Journal of Arid Environments 65: 319-335.
11. Range Sites and Soils in the United States. 1975. In: D.N. Hyder (ed.). Proceedings of the Third Workshop of the US/Australia Rangelands Panel. Society for Range Management, Denver, CO.
12. Miller, M. E. 2005. The structure and functioning of dryland ecosystems: Conceptual models to inform long-term ecological monitoring. U. S. Geological Survey Scientific Investigations Report 2005-5197. Reston, VA. 74 pp.
13. Peterson, F. F. 1981. Landforms of the Basin and Range Province, Defined for Soil Survey. Technical Bulletin 28, Nevada Agricultural Experiment Station, University of Nevada, Reno.
14. Schoeneberger, P.J., Wysocki, D.A., Benham, E.C., and Broderson, W.D. (editors), 2002. Field book for describing and sampling soils, Version 2.0. Natural Resources Conservation Service, National Soil Survey Center, Lincoln, NE.
15. Stringham, T.K., W.C. Krueger, and P.L. Shaver. 2003. State and transition modeling: an ecological process approach. Journal of Range Management 56: 106-113.
16. Tugel, A., J. E. Herrick, J. R. Brown, M. J. Mausbach, W. Puckett, K. Hipple. 2005. Soil change, soil survey, and natural resources decision making: a blueprint for action. Soil Science Society of America Journal 69: 738–747.
17. Westoby, M, B. Walker, and I. Noy-Meir. 1989. Opportunistic management for rangelands not at equilibrium. Journal of Range Management 42: 266-274.

Ecological Site Description Workshops and Presentations

Ecological Site Description Development Workshop November 15-18, 2005 Jornada Experimental Range, New Mexico State University, Las Cruces, NM	Introduction to ESD Development Workshop - Brandon Bestelmeyer Overview, Organization, Components of ESDs - George Peacock, Dan Caudle - ESD: Contents and Data Requirements and Interagency Ecological Site Description Manual Steps in Producing ESDs: A Perspective from Arizona - Dan Robinett Step 1: Climate, Geomorphology, and Soil Development in Landscapes - Curtis Monger Paleoclimate- Curtis Monger Step 2: Integrated Map Unit Design: Defining MLRAs, LRUs/CRAs, Soil Map Units, and Ecological Site Development - Arlene Tugel - Ag Handbook 296 Land Resource Regions and Major Land Resource Areas of the US and Soil Survey and Ecological Sites: Integrated Map Unit Design and Interpretation The Relationship of Ecological Site Descriptions to the Terrestrial Ecological Unit Inventory (TEUI) of the Forest Service - Wayne Robbie Step 3: Vegetation Dynamics In State and Transition Models (STMs): History, Concepts and Examples - Joel Brown Beyond Plants: Indicators and Soil Surface Properties in STMs - Arlene Tugel Measurements, Calculations, and Database Storage and Retrieval - Laura Burkett, Brandon Bestelmeyer Vegetation and Soil Sampling for STM Development - Brandon Bestelmeyer, Dan Robinett Mock State-And-Transition Model Workshop: How to Probe Their Minds- George Chavez, Homer Sanchez, Brandon Bestelmeyer Developing and Using Ecological Reference Sheets Based on Rangeland Health Indicators- Arlene Tugel, Phil Smith, Homer Sanchez Resources and Strategies for ESD Development- Brandon Bestelmeyer
State and Transition Monitoring Workshop August 28-30, 2006 Corvallis, Oregon	Threshold and State Concepts Used in ESDs: Needs and Applications- Brandon Bestelmeyer Ecological Thresholds: Bridging Theory and Application- D.D. Briske, F.E. Smeins, F.D. Fuhlendorf Evaluating S&T Models and ESDs- Fuhlendorf Considerations When Applying Thresholds to Management - Jeff Herrick NRCS Efforts in Developing and Utilizing State and Transition Models- Shaver State and Transition Modeling History & Current Concepts- Tamzen K. Stringham
Integrating Soil Properties and Ecological Site Descriptions September 26-27, 2006 Las Cruces, NM	Ecological Sites and Soil Survey (Part 1)- Arlene Tugel, NRCS and the NRCS Soils-ESD Advisory Group Site Descriptions-History, Concepts and Emerging Issues- Joel Brown, NRCS-Jornada Experimental Range A Framework for Soil and Vegetation Dynamics (Part 2)- Arlene Tugel, NRCS and the NRCS Soils-ESD Advisory Group This was a meeting of the Interagency Ecological Site Manual Team and included participants from Bureau of Land Management, Forest Service, ARS-Jornada Experimental Range, National Park Service, and Natural Resources Conservation Service. This meeting was hosted by Agricultural Research Service-Jornada Experimental Range, Las Cruces, New Mexico.
Riparian Ecological Site Description Workshop August 14-16, 2007 Albuquerque, NM	Geomorphic Stream Classification - W. Barry Southerland, Fluvial Geomorphologist, NRCS Riparian Workshop I, Geomorphic Components of Riparian Ecosystems - W. Barry Southerland Riparian Workshop II, Stream Classification Level II and Departure Analysis - W. Barry Southerland Riparian Workshop III, Departure and Potential - W. Barry Southerland Soils in the Riparian Complex, Incorporating Soil Dynamics into Ecological Site Descriptions - Kenneth F. Scheffe, NRCS Riparian Complex and Vegetation - Tamzen Stringham, OSU Channel Succession Riparian Plant Community Dynamics - Tamzen Stringham Vegetation Succession and Geomorphic Thresholds - Tamzen Stringham Ecological Sites in Riparian Areas - Bob Leinard, NRCS, Retired Issues With Riparian Ecological Site Descriptions - Brandon Bestelmeyer, ARS Jornada Experimental Range Selected Key Terms, Stream Geomorphology - by W. Barry Southerland, Fluvial Geomorphologist Part 654 - Stream Restoration Design - USDA, Natural Resources Conservation Service
Understanding and Improving Applications for Wildlife Habitat Management in Sagebrush Ecosystems October 23-25, 2007 Park City, Utah	Following the workshop, there were many requests for opportunities to view the high quality presentations provided at the workshop. As a result, speaker presentations are now availbable at: http://rangelands.org/esd_presentations.shtml We thank the speakers for their efforts at the workshop and their willingness to share their informative presentations. Workshop organizers have also produced a "Synthesis of the Comments From the Breakout Sessions". This document can be viewed at: http://www.rangelands.org/pdf/esd_summary_recommendation.pdf
State-and-Transition Models: Triggers, Feedbacks and Thresholds January 28, 2008 Louisville, Kentucky	The 2008 Joint Meeting of the Society for Range Management and the American Forage and Grassland Council Current Status of the State-and-Transition Framework - Tamzen Stringham, David D. Briske, Brandon T. Bestelmeyer, Pat L. Shaver Variation in Ecological Resilience: A Fundamental Concept for Rangeland Ecology - Brandon T. Bestelmeyer, David D. Briske, Joel Brown, Kris M. Havstad, Rhonda K. Skaggs Resilience-Based Application of State-and-Transition Models - David D. Briske, Brandon T. Bestelmeyer, Tamzen K. Stringham, Pat L. Shaver Soils, Resilience, and State and Transition Models - Jeffrey E. Herrick, Skye Wills, Debra Peters, Arlene Tugel, Brandon Bestelmeyer Rangeland Health Indicators: Can they provide early warning signals? - David A. Pyke Resilience, Triggers, Feedbacks and Thresholds: A Western Juniper Model - Steven L. Petersen, Tamzen K. Stringham Winterfat in the Catlow Valley: Ecological Resilience and State-and-Transition Modeling - Casey A. Matney Vulnerability and Triggers in Threshold Development: Models from the Chihuahuan Desert - Brandon T. Bestelmeyer, Jeffrey E. Herrick, Caiti M. Steele Plant Community Dynamics in the Northern Great Plains - Recognizing the Impacts of Invasive Species - Jeffrey L. Printz, Stan Boltz Resilience and Feedbacks within A Deep Sand Savannah Ecological Site - Pat L. Shaver

General ESD/S&T presentation

General state-and-transition model presentation

ESD development presentation