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1 January 2008 Seventy-Eight Years of Vegetation Dynamics in a Sandhills Grassland
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Abstract

The Nebraska Sandhills are a unique and valuable grassland resource within the Great Plains with a long history of grazing. In 1926, a vegetation study was established at the Nebraska National Forest Bessey Ranger District to investigate plant community changes in response to heavy grazing. At the time, heavy grazing was being used to shift the grassland plant community dominance from Schizachyrium scoparium (Michx.) Nash (little bluestem) to Bouteloua hirsuta Lag. (hairy grama) in order to create a natural firebreak to protect the adjacent forest from wildfires. Species frequencies were collected from 48, 1-m2 permanent plots in 1926, 1927, 1929, 1931, 1938, 1948, and 1979 to 2004. We evaluated long-term vegetation dynamics by investigating the influence of summer grazing and precipitation on the plant community using Detrended Correspondence Analysis (DCA) and correlations. We determined that grazing had more influence on the plant community than precipitation, with the DCA axis 1 representing a grazing intensity gradient and the DCA axis 2 representing an equilibrium – non-equilibrium gradient. Heavy grazing coupled with drought reduced frequency of most species, but did not cause a permanent change in plant community composition. Improved management of the Sandhills, together with the inherent stability of the grassland, will continue to protect this landscape from severe degradation and erosion.

James Stubbendieck and Susan J. Tunnell "Seventy-Eight Years of Vegetation Dynamics in a Sandhills Grassland," Natural Areas Journal 28(1), 58-65, (1 January 2008). https://doi.org/10.3375/0885-8608(2008)28[58:SYOVDI]2.0.CO;2
Published: 1 January 2008
JOURNAL ARTICLE
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