. The Caribbean forester. Forests and forestry Caribbean Area Periodicals; Forests and forestry Tropics Periodicals. Vol, 24 No, 1 - 1963 49 30- 70- \ 60-1 / \. 2000 2500 3000 ALTITUDE IN FEET Figure 3. Number of stems by species and altitude. dbh, species, and crown position. Heights of several dominants on each plot were also measured. When the field work was completed, some 1000 trees had been measured on a total of acres, and a total of 27 species were identified. DISCUSSION CURVES OF BASIC MEASUREMENTS The data from these measurements are summarized by the graphs in Figure 2. The num
. The Caribbean forester. Forests and forestry Caribbean Area Periodicals; Forests and forestry Tropics Periodicals. Vol, 24 No, 1 - 1963 49 30- 70- \ 60-1 / \. 2000 2500 3000 ALTITUDE IN FEET Figure 3. Number of stems by species and altitude. dbh, species, and crown position. Heights of several dominants on each plot were also measured. When the field work was completed, some 1000 trees had been measured on a total of acres, and a total of 27 species were identified. DISCUSSION CURVES OF BASIC MEASUREMENTS The data from these measurements are summarized by the graphs in Figure 2. The number of trees per acre increased from 595 at the 1960-foot level to 3240 per acre at the 3350-foot level. Average height of the dominants de- creased from 60 feet at 1960 feet elevation to only 12 feet at 3350 feet elevation. Obser- vations made in the vicinity of the latter level showed that the trees decreased to less than two feet in height around an exposed rock summit to the north of the main summit of El Yunque. Observations made throughout the transect indicated that the decrease in height was quite irregular, and greatly de- pendent on local exposure. In some plots the heights of the dominants varied consider- ably, depending on whether they stood on the windward or leeward side of the ridge. The average of the plots decreased from to inches as the altitude in- creased. Maximum plot diameter decreased from 60 to 8 inches. The basal area curve was the most irregular of the data recorded. However it was apparent that the basal area also de- creased as altitude increased, from around 300 square feet per acre at the lower altitudes to 160 square feet per acre at the higher Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern Forest Experiment Station (New Orleans, La. ). Rio
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