Ecology

The Stewardship Ranch is located in the Arkansas Valley ecoregion, which consists of the low Arkansas River valley from east central Oklahoma to central Arkansas. This broad valley separates the rugged Ozark Highlands to the north from the Ouachita Mountains to the south. The Central Oklahoma/Texas plains form the western border.

General Physical Characteristics

Annual precipitation in this ecoregion averages about 44 inches (111 cm) and temperature averages 62 degrees (17 degrees centigrade). The growing season averages 216 days.

Flat lowlands with poor natural drainage characterize most of the area. Isolated hills are scattered throughout the plains. Soils in the area are generally poor except along larger streams. This ecoregion drains into the Canadian and Arkansas Rivers. A tributary of the Arkansas, the Poteau River, runs through the ranch. Like other tributaries, it is a slow, clear stream.

Species Diversity
In the late `80s, the center did an inventory of the plants and trees of the ranch’s 4000 acres of pasture, bottomland, woodland, and riparian areas and catalogued 500 species.
Three hundred and twelve vertebrate species are native to this region, including white tailed deer, raccoons, bears, ducks, red and gray fox, bobcat, hawks, and river otter. One hundred species of birds, including owls and snow geese, call this region home. Many of these can be viewed on the ranch.

Natural Communities
The Arkansas River Valley forms a break between the Ozark Highlands to the north and the Ouachita Mountains to the south not only in geologic formation but also in community composition. The Stewardship Ranch is located just north of the Ouachita Mountains.

Before settlement, tall grass prairie communities containing bluestems, switchgrass, and other tall grasses dominated much of the broad valley. A wide variety of wildflowers and other plants also were present in great numbers. Prairie communities were often scattered between dry upland forests and bottomland hardwood forests that occurred along streams. Fire was an important component in maintaining these communities.

Shortleaf pine savannas occupied ridge tops of this ecoregion. Because these forests are an extension of those dominating the Quachita Mountains, they are similar in structure and function.

Lush forests of oak, elm, and hackberry occurred along streams and rivers. These tall forests (about 100 feet/30 meters) usually had two or three other levels of trees below the understory and often accumulated dense mats of leaves and other litter. Scattered clumps of low vegetation thrived in these heavily shaded forests except in openings, where a lush growth of herbaceous plants covered the ground. Grape, poison ivy and greenbrier vines were common.

Today much of the ranch is pastureland, dominated by Bermuda and tall fescue grasses, both introduced species. Remnants of the natural communities still remain on the ranch, and agroforestry and riparian protection projects have enhanced or restored others.

Throughout, the ranch retains its natural beauty. Crossing the Poteau River to the south side of the ranch, you can imagine you are entering another world, a world before fences and energy crises, a more spacious world of vast prairie, broken by forest of oaks and watered by shimmering oxbow lakes.

A summer pond on the Stewardship Farm

On summer evenings, comes the clamor of tree frogs, the buzz saw of cicadas and the insistent call of the chuck-will’s-widow. There are wild smells—the sharp perfume of compass flowers, the resin of pine, and the vanilla of native clover in the humid air along with the earthy smell of cattle.

On a foggy morning, the shiny green fescue is as beautiful as the native big bluestem, and the cows emerging from the fog are as handsome as the deer, their bellows as startling as the bugling of elk.

The farm is a part of nature. That is an ancient, basic idea. But in modern, industrial agriculture, this view of the farm has been replaced by simpler models such as the farm as mining operation, where food is extracted, like gold, from the soil; or the farm as factory, where food is assembled, like a bicycle, from a few raw materials.

In 1986, the Kerr Center began to transform the Kerr Ranch from a well managed conventional spread into a model sustainable enterprise, tapping into the natural cycles of abundant sun and rain in southeastern Oklahoma to grow grass and beef without relying on chemical fertilizer. In doing so, it became the only sustainable agriculture organization with livestock as a primary focus.

* Information on the Arkansas Valley ecoregion was taken from: Oklahoma Biodiversity Task Force, Norman L Murray, editor, Oklahoma’s Biodiversity Plan: A Shared Vision for Conserving Our Natural Heritage, Oklahoma Department of Wildlife Conservation, Oklahoma City, Oklahoma, 1996