The Nature Conservancy in Oklahoma - Oklahoma Preserve

Tallgrass Prairie Preserve

Sunrise at the Tallgrass Prairie
by Jay Pruett TNC

The Tallgrass Prairie Preserve is the largest protected remnant of tallgrass prairie left on earth. Originally spanning portions of 14 states from Texas to Minnesota, urban sprawl and conversion to cropland have left less than 10% of this magnificent American landscape. Since 1989, the Conservancy has proven successful at restoring this fully-functioning portion of the tallgrass prairie ecosystem with the use of about 2500 free-roaming bison and a "patch-burn" model approach to prescribed burning.

Biodiversity Threats in the area include habitat fragmentation and loss, current grazing and fire practices, invasive plant species such as sericea lespedeza and eastern red cedar, and stream degradation due to land management practices and soil erosion.

Up early on the Prairie
by Jay Pruett TNC

What the Conservancy is doing now will offer conservation-minded ranchers an alternative to traditional grazing practices. Conservancy staff have already conducted several "patch-burn" workshops with area cattle ranchers to illustrate the potential rewards of embracing this wildlife-friendly method of land management, while continuing to meet the bottom line for their cattle production operations. In addition to alternative grazing practices, The Nature Conservancy is offering to hold conservation easements for land owners who would like to ensure the preservation of their property.

Our "Patch Burn" approach utilizes prescribed burning on roughly 1/3rd of productive rangeland each year, leaving the remaining portions undisturbed by fire. Early research by Oklahoma State University indicates that the complex and mosaic plant communities produced by this "patchy" approach offers huge rewards for biodiversity. Approximately three dozen prescribed burns are conducted each year totaling 15,000 - 20,000 acres. Since 1991, over 350 prescribed burns have been conducted totaling 210,000 acres. In addition we have assisted neighboring ranches burn 170,000 acres and helped them suppress 50 wildfires.

Fire on the Prairie

The Tallgrass Prairie Ecological Research Station was completed in 2004. This state-of-the-art facility will offer field researchers the opportunity to conduct extended studies and initiate laboratory analysis for rangeland research. The research station will also be utilized as a workshop destination for university students, researchers and conservation professionals from across the United States.

More than three dozen research projects are active on the preserve, and 78 publications in scientific journals have been produced. An exciting "patch-burn" was initiated with Oklahoma State University in 2001 on 7,300 acres. This study is testing the wildlife, plant community and cattle gains in patch-burn versus completely burned cattle pastures. The objective is to achieve similar conservation benefits as those documented in the fire-bison unit while retaining profit margin for cattle ranchers.