Lyndon B. Johnson National Grassland NEON - United States of America

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Basic Information
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Site Name
Lyndon B. Johnson National Grassland NEON
Short name
CLBJ
Country
United States of America
Web Address
https://www.neonscience.org/field-sites/clbj
Site Manager
Rajit Patankar
Site Description
Caddo – Lyndon B. Johnson National Grasslands (CLBJ) is a terrestrial NEON field site located in the Great Plains region of north-central Texas, about 50 km (30 mi.) northwest of Denton. CLBJ occupies approximately 80 km2 (20,000 acres) of public lands managed by the U.S. Forest Service. NEON samples 41.9 km2 (10,300 acres) of area at CLBJ. The site has fairly flat terrain and consists of a mosaic of oak-dominated forests and grasslands. CLBJ is part of NEON's Southern Plains Domain (D11), which stretches over the central sections of Texas and Oklahoma and includes portions of southern Kansas and southern New Mexico. D11 has three other NEON field sites, including one additional terrestrial and two aquatic sites, located in Texas and Oklahoma. CLBJ is colocated with the Pringle Creek (PRIN) aquatic field site.
Relationships to other sites
This site groups with:
Last modified
2025-09-17 11:13:33

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General Characteristics and Status
Site Status
Operational
Year Established
2016
Observed properties
Affiliation and Network Specific Information
Affiliation
GERI✔This site is a verified "GERI" member.
NEON✔ (CLBJ)This site is a verified "NEON" member.
Photos
CLBJ Flight Survey
CLBJ Flight Survey
CLBJ Vegetation
CLBJ Vegetation
Geographic
View in site map
Centroid/Representative Coordinates

Latitude: 33.401231 Longitude: -97.57

Size
ca. 4188.00ha
Elevation (average)
272.00msl
Elevation (min)
258.00msl
Elevation (max)
343.00msl
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Site information [.json]

Centroid/representative coordinates [.shp] [.kml] [.geojson]
Bounding Box [.shp] [.kml] [.geojson]
GEO-BON Biome
Terrestrial
Biome
Deciduous Forest
Ecosystem Type
Forest
Deciduous Forest
Air Temperature: Average Annual
17.50°C
Precipitation Annual
840.00mm
Geology
The underlying geology of CLBJ is primarily interbedded sandstone and siltstone of the Antlers Sand Formation; some residuum and colluvium are derived from calcareous limestone of the Walnut Clay Formation and local alluvium. The region’s topography rolling and hilly due to differential erosion, becoming more rugged in the west.
Vegetation
The Caddo-LBJ National Grasslands has fairly flat terrain and consists of a mosaic of oak-dominated forest and grasslands. The dominant canopy species at CLBJ are post oak (Quercus stellate) and blackjack oak (Q. marilandica). Important grass species include little bluestem (Schizachyrium scoparium), big bluestem (Andropogon gerardi), Indiangrass (Sorghastrum nutans), and switchgrass (Panicum virgatum).
Soils
CLBJ soils are Udic Paleustalfs, according to the USGS Mineral Resources Database Duffau, Weatherford, Keeter, Pidcoke, Wise and Windthorst soils are all present at the site; Duffau and Windthorst are the most common, although Windthorst is considered transitional between Duffau and Weatherford. High-clay soils can inhibit tree growth due to low permeability.
Site Type
Platform
Design of Experimentation
mainly experimentation
Scale of Experimentation
beyond catchment scale
Design of Observation
mainly observation
Scale of Observation
beyond catchment
Permanent Power Supply
Yes
Accessible All Year
Yes
Permanent Operation
Yes