Structural characteristics, rate of gap formation and turnover rate in dry dipterocarp forest at Sakaerat. [Nakhon Ratchasima province, Thailand]
1986
Siripa Nilroung
The mean area of canopy gap in four hectare plots (4 subtypes) of dry dipterocarp forest were 98, 82, 110 and 105 m2 in plot 1,2,3 and 4. There were approximately 19.6, 27, 27.4 and 26.7 percent of total land area. These findings supported the presumption that trees regenerate in the gaps made by the fallings or death of one or several canopy trees. The concentration of gap formation in particular years was not observed. On the average 0.38, 0.88, 0.58 and 0.77 canopy trees per hectare died in plot 1,2,3 and 4 and the gap area of 0.36 - 0.73, 0.50 - 1.0, 0.51 - 0.02 and 0.42 - 0.84 m2 per hectare in plot 1,2,3 and 4 were made annually. The turnover time of the canopy layer in the forest, which was calculated from the rate of the gap formation as 122-244, 81-162, 79-158 and 100-199 years in plot 1,2,3 and 4. The turnover time was comparable to that calculated from the annual increment of death rate based on biomass of dead trees and the biomass of the forest. Sampling and seeding of the important tree species will regenerate in the gap and will grow well to become the canopy trees in the future.
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