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Species Diversity

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Submitted By jtl012latech
Words 646
Pages 3
Benjamin Moore
Dr. William Ross
For301
6 February 3015
Species Diversity A diverse ecosystem is a stable ecosystem. Without it an ecosystem would have a much harder time recovering from disturbances and resisting perturbations. To measure diversity it is as simple as using a formula called the Simpsons Diversity Index. In the lab we surveyed two separate plots to calculate their diversity. In the species diversity lab we started off by taking a field trip from south campus to Wafer Creek Ranch. The purpose of the field trip was to split into two separate groups and measure the diversity on them. The two plots were marked off with biodegradable flagging and everything in the flagging was examined and recorded. To do the second plot we underwent the same instructions as on the first plot, but the plots were three chains apart. The information gathered on the field trip was then plugged into the formula and the diversity of the two plots was calculated. The results are in the following tables.

Site 1 | | Total Trees | Diversity | Location | Sweetgum | 18 | 0.052 | Midstory | Honeysuckle | 1 | 0 | Understory | Water Oak | 1 | 0 | Understory | Smilax | 40 | 0.297 | Midstory | Red Oak | 4 | 0.002 | Understory | White Oak | 8 | 0.011 | Understory | Carolina Buckthorn | 1 | 0 | Understory | | Diversity= 1-.368 | |

Site 2 | | Total Trees | Diversity | Location | Black Gum | 1 | 0 | Midstory | Black Cherry | 6 | 0.046 | Midstory | White Oak | 7 | 0.065 | Midstory | Mockernut HIckory | 1 | 0 | Midstory | Smilax | 5 | 0.031 | Understory | Black Oak | 1 | 0 | Midstory | | Diversity=1-.745 | |

The plots used in this lab were both similar and different in several ways. The plots are the same in the fact that they have virtually the same species in them. The plots both have several different species of oak in them as well as smilax. The two sites were only three chains apart so they were in the same general area of the stand. The two sites had several oak species and no pines even though the samples were in a mainly pine stand, they just didn't happen to be in our tenth acre plot. The two sites were different in the location of each of them. The first site was beside road on relatively flat area, the second site was on the side of a large hill. The age and size of the species in the sites was also very different. The first site had mainly understory and midstory species in it. While the second site had all midstory except for a few smilax. The size of the species in the second site were also much larger, the species were actually trees and not little sticks sticking up out of the ground. The understory was also very open in the second site. The second plot of the two that we sampled had the highest diversity. The diversity of the second plot was D=1-7.45. The reason the second one was more diverse is because it is on the side of a hill going down into a bottom. The first site was in more of a upland area and was not as diverse. The diversity of the first site will eventually get higher as the site gets older because the species growing will get bigger and it still had smaller species popping out of the ground. The site looked as though it had been disturbed by a fire in the last few years which explains why there isn't a lot of different species there. With age the site will eventually get pines which will in turn be shaded out by the oaks without prescribed burns. The second site is not the oldest out there but it is mature. The oaks will continue to grow and keep shade intolerant species shaded out on the understory. The site will continue to grow old and one day be cut.

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