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Ecological Site Information

Tyson Hart
Range Management Specialist
Phone: 936-462-8185 
Location: Nacogdoches, TX
Colin Walden
Range Management Specialist
Phone: 405-742-1223
Location: Stillwater, OK
David Kraft
Regional Ecological Site Specialist
Phone: 620-343-7276
Location: Emporia, KS
Region 9 Ecological Site Specialist Contacts


Provisional Ecological Site (PES) Completion Map

Major Land Resource Areas (MLRAs)

As of October 1, 2018

Map showing status of Provisional ecological site descriptions for FY2016 to FY 2019.





National Instructions, Title 430 – Soil Survey, Part 306 Ecological Site Inventory and Ecological Site Description, dated 4/2/2015, provided guidance on a shared effort between the Soil Science and Resource Assessment (SSRA) and Science and Technology (S&T) deputy areas including NRCS staff at
the local, State, and national levels. The instruction implemented a 5-year initiative to be
completed in fiscal year 2020.

Provisional Ecological Site Descriptions (PESDs) have been and will continue to be developed on
grouped soil components by Major Land Resource Area (MLRA). Provisional ecological sites are first
approximations based on broad groupings of soil properties (measured and predicted) and vegetation
characteristics associated with those groupings. They are intended to function within the context
defined by the MLRAs or refined land resource units (LRUs). The Provisional Ecological Site (PES)
concept groups spatial soil units (components) and their properties that exhibit similar behavior
in their production, their community dynamics and their response to disturbance. PESDs are the
first step in developing correlated and approved ecological site descriptions (ESDs).

Click on Ecological Site Description (ESD) to view an example of the newly designed ESD
currently under development throughout the region. This example should only be considered an example.

Approved Ecological Site Descriptions can be viewed on the Ecological Dynamics Interpretive Tool
(EDIT) website

For more information please contact the Ecological Site Specialist in your area