Light intensity effect on number of seedlings and growth of Gyrinops versteegii

Abstract

Due to the depletion of its natural population, the Gyrinops versteegii species, one of the species producing agarwood, has been domesticated in Indonesia, particularly in Sragen Central Java. As a result, it was designated as a vulnerable species in both CITES Appendix II and the IUCN Red List Ver23. The research objective is to determine the effect of the light intensity on the number of seedlings, tree density, height, and diameter of the G.versteegii tree growth. The study was conducted from February to October 2018 at a domesticated agarwood community forest in Sragen, Central Java. A systematic plot method, a random start, was applied to this research with 28 nested plots, 1x1 m2 for seedlings and 10x10 m2 for the trees. The data were analyzed using both hierarchical clustering and correlation analysis. The relative light intensity of 2,82% led to an enormous number of seedlings and tree diameter, while the relative light intensity of 0.31% resulted in the highest tree density. The number of seedlings and tree diameter was strongly correlated with the relative light intensity. In contrast, there is an inverse relationship between tree density and relative light intensity.