Comparing the biodiversity of three plant communities

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03.09.2004        Biology        Li Zheng Yuan

Comparing the biodiversity of three plant communities

Data Collection:

Below are three tables showing the number of species found in each quadrat in each group.

Site 1: Waste ground on the edge of the park

Site 2: Lawn in the park

Site 3: Edge of football field

  • The sum of the species found in site 1 is 116. Therefore the average species found in this area can be calculated by sum divide by the number of sampling (25), 116/25=4.64 species.
  • The sum of the species found in site 2 is 88. Therefore by the same method as above, its average is 88/25=3.52 species.
  • The sum of the species found in site 3 is 74. Therefore by the same method as above, its average is 74/25=2.96 species.
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  • Standard deviation can be calculated by:

Therefore, the standard deviation for the site 1 is 1.261110622, for the site 2 is 0.9431860898 and for the site 3 is 1.341044369.

  • From the graph below we can see the difference in the distribution of the number of species in these three areas very clearly:

                ● 1st site: most around 4 to 6 species

                ■ 2nd site: most around 3 to 5 species

                ▲ 3rd site: most around 2 to 4 species

        This graph helps us to clarify the diversity of the three sites: 1st site the most, 2nd site the least & 3rd site the lowest.

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