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Tallgrass prairie vegetation, existing as numerous but small relicts scattered across the prairie region of central North America, exhibits a complex pattern of community structure and composition. The objective of this study was to partition this complexity into its components simultaneously at both local and geographical scales. Sets of vegetation samples were used from 11 different prairie preserves in Iowa and eastern Nebraska spanning three physiographic regions and the full range of upland tallgrass prairie habitats. Numerical analyses of the entire data set, and partitioned ordination, demonstrated the manner in which the patterns of vegetation variation combined to produce the tallgrass landscape. The broadest pattern of variation, across regional landscapes and within local sample sets, was associated with the complex topographicmoisture gradient. Within this pattern, several directions of vegetation variation were apparent, some confounding the overall pattern. These included variation across differences in subsoil permeability, biogeographic differences perhaps reflecting macroclimatic or historical factors, and local peculiarities of stand composition and dynamics.

Regional and local variation in composition and structure of the tallgrass prairie vegetation of Iowa and eastern Nebraska