Final Ecology Paper

Final Ecology Paper - Kristie Fambro 4/28/10 Final Lab...

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Kristie Fambro 4/28/10 Final Lab Write Up Introduction: The Pinus taeda population at Kennesaw State University was observed on the hillside behind the science building. Across the hillside, pines were observed to be in different classes based on visible reproductive structures, heights, and circumference of the tree trunks. The difference in age for this population was a result of human disturbance with construction years back. The disturbance left only a few pines on the hillside. The remaining pines represent the tallest, broadest trees on the hillside and have reached reproductive maturity. Younger pines have begun to grow under the canopy of the older pines. Seedlings under the canopy of the older trees were smaller than a pencil in circumference and approximately a foot in height. Pines taller than four feet were limited in number near the older pines. Taller pines, approximately 4-10 feet in height, were found in areas away from the older pines, but not near the older pines. These pines were grouped together and many had not reached reproductive maturity. It was predicted that the age gap in the Pinus taeda population on the hillside is a result of competition between various generations of pines. Pine invasion in different sized fields in southeastern United States has been researched. In a study done by Pinder and Golly, fields of various sizes had different reproductive success. Poor reproductive success was attributed to many factors: such as seed predation, offspring mortality, and suppressed growth as a result of competition (Pinder & Golley, 1995). Offspring mortality and suppressed growth could have contributed to age gaps on the KSU hillside. Self thinning occurs in ecosystems when entire tree populations die. This process could be a direct or indirect result of not enough light, water, or soil nutrients to sustain the entire population (Peet & Christensen, 1987). This concept is usually applied to relatively even aged populations of the same species. Kramer’s studies evaluated the effects of light and moisture on Pinus taeda and P. Enchinata populations. The margin had less moisture than the interior forest stands, but a greater light intensity
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This note was uploaded on 02/05/2011 for the course BIOL 2107 taught by Professor Brookshire during the Spring '08 term at Kennesaw.

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Final Ecology Paper - Kristie Fambro 4/28/10 Final Lab...

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