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Reproduction of acacia koa after fire



Reproduction of acacia koa after fire



Pacific Science 30(2): 177-186



The abundance, distribution, growth, and mortality of koa (A. koa Gray) seedlings after fires were monitored periodically on 2 burned areas on Oahu for 2.5 yr. On 1 area, seedling density peaked at 95,300/ha 6 mo. after the fire; 21 mo. later it had declined to 18,500/ha. On the other area, peak seedling density occurred at 2 mo., with 20,400/ha; 26 mo. later, density had dropped to 7900/ha. Seedlings were not distributed uniformly over the burned areas but were concentrated near koa seed trees. Height growth for seedlings on 1 area averaged 2.6 cm/mo.; on the other, 1.9 cm/mo. Several pathogens were identified, but only the root-crown fungus, Calonectria crotalariae, caused serious damage. More than 50% of the mortality was attributed to 1 burn. The regeneration in the burned areas was studied, indicating that koa will continue to be a component of the forest vegetation.

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