Abstract
The spatial distribution, survival and growth of Elateriaspermum tapas Blume (Euphorbiaceae) were studied from the data of a 1-ha permanent plot at Gunung Berni, West Kalimantan. In the plot, number of species and individuals of Euphorbiaceae were 35 and 254, respectively and the most abundant and dominant was E. tapas. Forty four percent of seeds produced in a mast fruiting season could be escaped from predators and germinated into seedlings. The number of the established seedlings was drastically dropped in the next year of the mast fruiting and slightly increased in the second year.The species has classical inverse J-shaped frequency size distribution, suggesting its continuous regeneration. The species was contagiously distributed in the plot. Mortality of shorter seedlings was higher than that of taller seedlings, and the mortality of seedlings in the gap was slightly higher than that of in closed forest. The mortality rate of seedlings was not related to the density of cohort seedlings and variables representing stand structure. The relationships among measured tree dimensions drew a simple linear; suggesting the growth pattern of tree dimensions in each individual plant was closely dependent one to another. The RGR-height tended to decrease in hyperbolic manner by increasing the height of seedlings and saplings, and the RGR-height in the gap were consistently higher than that in the closed forest. The RGR of height on seedlings and saplings or the RGR of diameter on trees in the sub-plots was not significantly related to the variables representing stand structure and relative light intensity ambient the individuals.
