Tree Diversity: Quantitative Analysis of Forest Communities Results and Conclusions
A college level example of the results and conclusions sections of a lab report for a qualitative analysis of forest communities lab.
Results:
Density
According to the class’ findings, the mean density in the old habitat was 0.217 and the standard deviation was 0.026, as shown in Table 1 and Figure 1. Table 1 and Figure 1 also show that the mean density in the new habitat was 0.207 and the standard deviation was 0.053. Overall, we can see in Figure 1 that the densities of the two habitats are almost equal; the old habitat may have a slightly higher density of trees overall.
Table 1
OldGrowth Forest 
NewGrowth Forest 

Species 
Diameter (m) 
Density 
Species 
Diameter (m) 
Density 
Flowering Dogwood 
1.27 
0.220 
American Beech 
2.86 
0.154 
Sugar Maple 
2.23 
0.220 
Northern Red Oak 
29.92 
0.154 
White Pine 
56.02 
0.220 
Red Maple 
9.87 
0.154 
Sugar Maple 
3.50 
0.220 
Red Maple 
7.64 
0.154 
Sugar Maple 
1.59 
0.220 
Red Panicle Dogwood 
2.07 
0.154 
Sugar Maple 
0.95 
0.220 
Black Ash 
1.91 
0.154 
White Pine 
48.70 
0.220 
American Beech 
1.27 
0.154 
Sugar Maple 
4.14 
0.220 
Panicle Dogwood 
11.78 
0.289 
Sugar Maple 
34.70 
0.220 
Red Maple 
9.87 
0.289 
Sugar Maple 
2.55 
0.220 
Red Maple 
21.80 
0.289 
White Pine 
18.78 
0.206 
Northern Red Oak 
1.59 
0.289 
Red Maple 
5.09 
0.206 
Northern Red Oak 
1.27 
0.289 
Panicle Dogwood 
2.23 
0.206 
Red Maple 
13.37 
0.289 
Panicle Dogwood 
1.59 
0.206 
Panicle Dogwood 
1.59 
0.289 
American Beech 
18.78 
0.206 
Panicle Dogwood 
1.75 
0.289 
American Beech 
21.65 
0.206 
Panicle Dogwood 
2.07 
0.289 
White Pine 
50.60 
0.206 
Panicle Dogwood 
2.55 
0.289 
White Pine 
57.61 
0.206 
Panicle Dogwood 
2.23 
0.289 
Sugar Maple 
19.42 
0.206 
Northern Red Oak 
17.50 
0.289 
Northern Red Oak 
28.01 
0.206 
White Pine 
54.11 
0.289 
Sugar Maple 
5.41 
0.239 
Paper Birch 
16.23 
0.289 
Sugar Maple 
5.73 
0.239 
Red Ash 
8.69 
0.196 
Sugar Maple 
3.69 
0.239 
Red Ash 
6.69 
0.196 
American Beech 
18.63 
0.239 
American Beech 
6.05 
0.196 
American Beech 
11.46 
0.239 
Red Maple 
5.51 
0.196 
Sugar Maple 
33.98 
0.239 
American Elm 
1.78 
0.196 
Sugar Maple 
62.42 
0.239 
Red Oak 
23.09 
0.196 
Live Oak 
2.23 
0.239 
Dogwood 
1.27 
0.196 
Live Oak 
5.57 
0.239 
Red Oak 
17.68 
0.196 
White Pine 
65.61 
0.239 
American Beech 
1.59 
0.196 
Red Ash 
14.49 
0.239 
White Pine 
70.03 
0.168 
American Beech 
1.91 
0.232 
Red Maple 
25.15 
0.168 
American Beech 
2.07 
0.232 
Red Maple 
11.46 
0.168 
Red Ash 
3.34 
0.232 
Red Maple 
3.18 
0.168 
E. White Pine 
56.66 
0.232 
“R Ash” 
1.27 
0.168 
Sugar Maple 
1.59 
0.232 
“R Ash” 
0.96 
0.168 
Sugar Maple 
2.23 
0.232 
“R Ash” 
1.27 
0.168 
Sugar Maple 
3.18 
0.232 
“R Ash” 
0.96 
0.168 
Sugar Maple 
4.11 
0.232 
Red oak 
19.42 
0.205 
E. White Pine 
52.04 
0.232 
beech 
1.59 
0.205 
Apple Tree 
2.35 
0.232 
beech 
2.23 
0.205 
Sugar Maple 
3.66 
0.232 
Red oak 
32.79 
0.205 
Sugar maple 
1.59 
0.231 
beech 
1.59 
0.205 
Sugar maple 
4.46 
0.231 
beech 
3.18 
0.205 
beech 
2.86 
0.231 
red oak 
23.55 
0.205 
white pine 
66.85 
0.231 
sugar maple 
24.83 
0.205 
red ash 
3.18 
0.231 
Buckthorn 
2.39 
0.155 
beech 
4.46 
0.231 
Buckthorn 
1.59 
0.155 
beech 
3.82 
0.231 
Buckthorn 
2.07 
0.155 
beech 
2.86 
0.231 
Oak 
27.07 
0.155 
white pine 
38.52 
0.231 
Dogwood 
1.43 
0.155 
Sugar Maple 
2.87 
0.155 
Dogwood 
1.59 
0.155 
Sugar Maple 
5.73 
0.155 
Red Maple 
13.38 
0.155 
Sugar Maple 
0.64 
0.155 
Mean Density 
0.207 

Beech 
5.73 
0.155 
Standard Dev. 
0.053 

Dogwood 
1.27 
0.155 
Av. DBH 
10.539 

Sugar Maple 
2.23 
0.155 

Sugar Maple 
1.59 
0.155 

Mean Density 
0.217 

Standard Dev. 
0.026 

Av. DBH 
15.353 
DBH
Ttest= 0.15 Based upon the data and the ttest, we can assume that there is not a significant tree size difference between the two habitats. The ttest gave us a value of 0.15, which is also considered the pvalue. When the calculated pvalue is greater than 0.05, such as in this case, we accept the null hypothesis. The null hypothesis says that any difference in tree size in the two habitats is a result of chance, meaning that there is not a significant difference in tree size in the two habitats.
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