. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). CARBON FERTILIZATION EFFECTS IN A SIMULATED ECOSYSTEM 333 4000 3000 E u < 111 DC < _l < to < 2000 1000 All species 762-m elevation soil depth _£_ , Normal _2_ , + 50%. 20 40 60 80 YEARS SINCE CLEAR-CUT Fig. 2 Simulated change in total basal area per 10- by 10-m plot during the first 100 years of succession following clear-cutting for forest stands whose trees had normal and 50% greater than normal annual diameter increments. Shown
. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). CARBON FERTILIZATION EFFECTS IN A SIMULATED ECOSYSTEM 333 4000 3000 E u < 111 DC < _l < to < 2000 1000 All species 762-m elevation soil depth _£_ , Normal _2_ , + 50%. 20 40 60 80 YEARS SINCE CLEAR-CUT Fig. 2 Simulated change in total basal area per 10- by 10-m plot during the first 100 years of succession following clear-cutting for forest stands whose trees had normal and 50% greater than normal annual diameter increments. Shown are the mean and 95% confidence intervals for 100 replicates in each treatment. more southerly latitudes. One expects this elevation to be a sensitive zone for a New England forest. Since none of the species is at its optimum, any environmental change might have a strong effect on any species, and perturbations might produce more pronounced effects here than elsewhere. Experiments were carried out at four levels of treatment: 10, 20, 50, and 100% increase in annual individual tree growth. The predicted effect on total basal area for 50% increase during the first 100 years of secondary succession is shown in Fig. 2. Although the total basal area of the treated forest is significantly greater than the normal forest during the first and second and later decades, there is no significant difference for the third, fourth, and fifth decades. At the end of 100 years, the ratio of the treated to normal means is : ; however, with 95% confidence this ratio could be anywhere between : 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 Brookhaven National Laboratory; Woodwell, G. M; Pecan, Erene V. [Washington] Technical Information Center, U. S. Atomic Energy Commission; [available from National Technical
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