Tree Diversity: Quantitative Analysis of Forest Communities Results and Conclusions

Published by Cathomps19
February 19, 2012, Category: Human Biology

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

Old-Growth Forest	New-Growth 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	Read more in Human Biology « China at War with India! Human Demography College Lab Example: Introduction » 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

T-test= 0.15 Based upon the data and the t-test, we can assume that there is not a significant tree size difference between the two habitats. The t-test gave us a value of 0.15, which is also considered the p-value. When the calculated p-value 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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Tags: belt transect, biological hypothesis, circumference, DBH, density, diameter at breast height, forest, null hypothesis, species evenness, species richness, Standard deviation, Tree