KERAGAMAN MORFOLOGI, EKOLOGI, POHON INDUK, DAN KONSERVASI ULIN (Eusideroxylon zwageri Teijsm. et Binnend.) DI KALIMANTAN

Abstract

In Indonesia, ulin (Eusideroxylon zwageri Teijsm. et Binnend.) is found naturally only in Sumatra and Kalimantan. Nowdays, exploitation of this species is still happening and therefore it tends to become distinct. At the other hand, there are still a lot of aspects that need to be studied. This study focused on morphological diversities, ecology, mother trees, and conservation of ulin in Kalimantan. Result of the study indicates that ulin has a very high diversity in morphological characters, both vegetatively and generatively (especially on shape and size of the fruits or seeds). Ecologically, ulin trees grow well in humid tropical forests, non innundated lands up to 500(-625) m above sea level, on flat areas surrounding the streams and rivers, on undulating lands, slopes and ridges. Regarding to thesoil conditions, the habitat of ulin is usually sandy, low pH and low macroscopic chemical elements (N,P,K). The potency of ulin as mother trees in nature vary from 22.11% to 32.30% of the total existing population. In connection with the conservation efforts, the in-situ and ex-situ conservations have been implemented; however, security and control for the conservation areas (mainly in-situ) need to be more improved.