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slight, half of the units have lost from 7 to 37 trees each since 1940. Half of the units had <br /> their highest tree density in 1940. A third of the units appear to have increasing numbers of <br /> trees. Results of the interpretation are presented in Table 12. <br /> Tree densities were estimated using black and white photocopies of air photography from <br /> 1940, 1963 and 1989 adjusted to 1:660 scale. For the analysis, fifteen non-overlapping <br /> oak-buckeye savanna units were outlined on an overlay sheet. and the acreage of each unit <br /> was estimated using a planimeter. For each year, stem densities were estimated based on <br /> tree canopy. The number of stems beneath larger canopies were estimated. Each unit was <br /> counted twice and the average of the two counts was used. Although we think the declining <br /> trend is real, the photo interpretation has not been field checked which will be necessary to <br /> determine accuracy as well as to select restoration areas. <br /> As previously mentioned, perennial grass restoration will be undertaken throughout much <br /> of the savanna, beginning with small demonstration plots. Coordination of the several <br /> types restoration efforts will be carefully integrated. In general grassland restoration and <br /> management will precede woody plant restoration for two reasons. First, grassland <br /> restoration is likely to be extensive and utilize large machinery. Second, it is reasonable to <br /> assume that native perennial grasses will enhance both natural and artificial oak <br /> regeneration. <br /> As noted on the preliminary site plan map (Map 4) all savanna areas, inside and outside <br /> developed areas, have potential for restoration based on an analysis of air photos from <br /> 1940, 1963 and 1989. <br /> Buckeye Ranch Resource Plan (November, 1993) <br /> 160 <br />