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Savanna Species

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Of these 14 species, 57.2% are classified as savanna species (appendix A), 21.4% are native to Wisconsin but not species commonly found in Oak Savannas and 21.4% are species considered exotic in Wisconsin (Figure 7A). When analyzing their frequencies, 90.6% of the species found in the area of study are considered savanna species, 3.4% Wisconsin natives, 5.1% were not identified and 0.9% exotic (Figure 7B). Figure 7. A. Species classification for the 14 different species found in the area of study. B. Percentage based on the relative frequencies of each class in the area of study. These 14 species are distributed differently across the area of study, with some species dominating specific areas while others are distributed scattered around the site (Figure 8). …show more content…

Species distribution across the area of study. One hundred and fifty two of the trees surveyed were dead (7.1%), with 81 of those (53.29%) situated in the Green Prairie management unit (Figure 9). Sixty seven out of this 152 trees (44%) were unable to identified and classified as Unknown. Of the percentage that could be identified, Black/Red Oak and Black Cherry presented the bigger frequencies (50 and 16, respectively). Figure 9. Dead trees found in the area of study. 4.2 Percentage of canopy density Sixty five measurements were made for the Southwestern Grady Oak Savanna area and part of the Green Prairie, by sampling 7 of the transects based on the UW Arboretum grid. The first two transects were sampled every 10 meters but the 5 remainings were sampled every 50 meters, due to time concerns (Figure 10). Figure 10. Points sampled for percentage of canopy cover. Based on the data obtained and using the Kriging tool in ArcGIS I created a percentage of canopy density map for the area (Figure 11). This map shows the different percentage of canopy density for the units, diving it into 6 classes ranging from 25.6% to

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