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Cross Timbers Transition

Ecoregion in OK

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The Cross Timbers Transition consists of rough plains that are covered by prairie grasses and eastern redcedar, scattered oaks, and elms. Terrain and vegetation are transitional between the less rugged, grass-covered ecoregions to the west and the hilly, oak savanna of Ecoregions 29a and 29h to the east. Since the early 19th century, both the abundance of upland trees and the number of tree species have greatly increased due, in part, to fire suppression. During the same period, natural riparian forests and wetlands have been degraded or lost due to channelization and land use changes. Today, land use is a mixture of rangeland and cropland. Rangeland is more common than in the Prairie Tableland (27d) and Red Prairie (27h). The growing season is shorter than in the Broken Red Plains (27i). Stream substrates are more rocky and less muddy than in Ecoregions 27d, 27h, and 27i.

— EPA

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