About Field Sites
The Klemme Range Research Station at the Oklahoma Agricultural Experiment Station (OAES) is a terrestrial NEON field site located in western Oklahoma, southwest of Clinton, OK. The site is managed by the Oklahoma State University Division of Agricultural Sciences. The research station consists of 6.3 km2 (1560 acres) of upland prairie in the Rolling Red Plains region of Oklahoma. OAES 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.  
OAES lies in the south Central Plains, a region that straddles the transition from relatively abundant precipitation in the east to semi-arid conditions in the west. The site has a mean average annual temperature of 15.5°C (60°F) and a mean average annual precipitation of 788.85 mm (31 in.). Because the region is located in the interior of the United States, it experiences a wide range of temperatures seasonally and annually. Additionally, precipitation is highly variable from year to year; however, the majority of precipitation falls during the spring and summer months. Severe thunderstorms are common in the area, while tornadoes and severe drought periods also occur, but are not as common.   
The soil parent materials at the OAES site are residuum and colluvium derived from the late Permian age Doxey Formation (shale), which is composed of reddish sandstone and siltstone. Siltstone is present at the OAES site. 
The major soils on the site are the Cordell and Obaro series. The Cordell soils form in residuum and occur on sideslopes of ridges and hills. Obaro soils occur on summits, crests, and shoulders of ridges and hills. Obaro soils form in colluvium and residuum. 
The primary crop in the Rolling Red Plains area is wheat. Within the site, the shortgrass prairie is interspersed with pockets of shrubs and small stature oaks. Dominant grasses include buﬀalo grass (Bouteloua dactyloides) and purple three-awn (Arisda purpurea). Broom snakeweed (Guerrezia sarothrae) comprises the majority of the patchy shrub cover. 
Animals native to this region of the Unites States include black-tailed prairie dog (Cynomys ludovicianus), swift fox (Vulpes velox), fulvous harvest mouse (Reithrodontomys fulvescens), and black-capped vireo (Vireo atricapilla). The area is also home to the threatened lesser prairie chicken (Tympanuchus pallidicinctus) and the mountain lion (Puma concolor), one of the only large mammals in the region.   
Past Land Management and Use
The Hatch Act of 1887 set up a national network of agricultural experiment stations focusing on research that would make American farms more productive. The Oklahoma Territory's legislature followed suit in 1890 by passing an act that established the Oklahoma Agricultural Experiment Station in Stillwater, OK. The research station has been continuously managing projects since its inception. At the end of the twentieth century, the station maintained approximately 250 research projects at any given time. In 1988, Marvin Klemme donated 1000 acres to Oklahoma State University for use agricultural development, research and education. The location was named after Marvin Klemme, a man who dedicated a large part of his life to the preservation and protection of our public lands system. The station was officially established in 1990 and is dedicated to improving range cattle production in western Oklahoma.   
Current Land Management and Use
The NEON site OAES is located within the Klemme Research Station, an outlying station designed to meet the agricultural needs of the localities near Bessie, OK. The station focuses on projects that promote the success of agricultural producers while benefiting consumers and conserving natural lands. Oklahoma State University students and faculty conduct ongoing research into a range of areas at the station, including batch burning, pasture and forage improvement, cow-calf and stocker cattle management, and agricultural education.  
NEON Site Establishment
Because OAES was already an established research station before NEON began to consider it as a terrestrial site, the workload was fairly small. NEON plots were established in February 2015, and terrestrial sampling began in June of that year.
 Terrestrial Observation System (TOS) Site Characterization Report: Domain 11. NEON.DOC.003894vB
 PRISM Climate Group., Oregon State University, http://prism.oregonstate.edu, created 4 Feb 2004.
 Cassola, F. 2016. Cynomys ludovicianus (errata version published in 2017). The IUCN Red List of Threatened Species 2016: e.T6091A115080297. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T6091A22261137.en. Downloaded on 14 May 2020 https://www.iucnredlist.org/species/6091/115080297#geographic-range
 Moehrenschlager, A. & Sovada, M. 2016. Vulpes velox. The IUCN Red List of Threatened Species 2016: e.T23059A57629306. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T23059A57629306.en. Downloaded on 14 May 2020 https://www.iucnredlist.org/species/23059/57629306
 BirdLife International. 2018. Tympanuchus pallidicinctus. The IUCN Red List of Threatened Species 2018: e.T22679519A131795740. https://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T22679519A131795740.en. Downloaded on 14 May 2020. https://www.iucnredlist.org/species/22679519/131795740
 Morley and Kemph. (2019). NEON Site-Level Plot Summary, Klemme Research Station (OAES), May 2019. https://data.neonscience.org/documents/10179/2361410/OAES_Soil_SiteSumm…
 U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. https://mrdata.usgs.gov/mrds/
Remote sensing surveys of this field site collect lidar, spectrometer and high-resolution RGB camera data.
This site has a flux/meteorological tower that is 8 m (26 ft) tall with four measurement levels. The tower top extends above the vegetation canopy to allow sensors mounted at the top and along the tower to capture the full profile of atmospheric conditions from the top of the vegetation canopy to the ground. The tower collects physical and chemical properties of atmosphere-related processes, such as humidity, wind, and net ecosystem gas exchange. Precipitation data are collected by a tipping bucket at the top of the tower.
One phenocam is attached to the top and the bottom of the tower. Here we show the images from the most recent hour. The full collection of images can be viewed on the Phenocam Gallery - click on either of the images below.
Soil Sensor Measurements
This site has five soil plots placed in an array within the airshed of the flux tower. Photosynthetically Active Radiation (PAR) at soil surface, soil heat flux, and solar radiation are measured at the soil surface in each soil plot. Soil moisture, soil temperature, and CO2 concentration are measured at multiple depths in each soil plot.
At terrestrial sites, field ecologists observe birds and plants, and sample ground beetles, mosquitoes, small mammals, soil microbes, and ticks. Lab analyses are carried out to provide further data on DNA sequences, pathogens, soils, sediments, and biogeochemistry. Learn more about terrestrial observations or explore this site's data products.
Field Site Data
Oklahoma State University
Site Access Allowed
Site Access Details
Reseachers should coordinate with the site manager.
NEON Field Operations Office
Domain 11 Support Facility
NEON Field Operations Address
1200 South Woodrow, Suite 100
Denton, TX 76205
NEON Field Operations Phone
Mean Annual Temperature
Mean Annual Precipitation
Dominant Wind Direction
Mean Canopy Height
Dominant NLCD Classes
Average number of green days
Average first greenness increase date
Average peak green date
Average first greenness decrease date
Average minimum greenness date
225; 310 DOY
Number of Tower Levels
Megapit Soil Family
Loamy - mixed - active - thermic Lithic Haplustepts
Related Field Sites
Other Domain D11 Field Sites
Other Field Sites in OK