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A Comparative Survey of Stem Density in Damaged, Primary and Secondary Rain Forest in Mastatal Costa Rica
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| Background
Sample Sites: |
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Survey type: The modified version of the variable-area transect method consisted of a transect plot with eight subplots. The transect line is 40 meters long with subplots on either side extending for a maximum of 20 meters. A minimum stem diameter of 5 centimeters was selected before the trees were counted. The diameter was measured using a DBH (diameter at breast height) tape. Each tree that was 5 centimeters DBH or larger was flagged and numbered with the transect, subplot and tree number. The first 5 trees that met the minimum DBH were recorded. If no trees met the minimum 5 cm DBH within 15 meters of the transect line, no trees were recorded and the subplot ended. If at least 1 tree met the minimum DBH within 15 meters of the transect line then the subplot continued to a maximum of 20 meters from the transect line. These variances in plot size will not present any statistically significant variances in the results |
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| Sample Site #1 | Sample Site #2 | Sample Site #3 | ||