The study aimed to gain information about tree species domination and association was conducted in lowland tropical forest of Tangkoko Nature Reserve. The tree with ≥10 cm dbh censused with quarter method. The result showed that Palaquium sp. having the highest domination species with Index Importance Value 21.05, as well as Cananga odorata Hook.f. & Thoms. and Dracontomelon dao (Blanco) Merril & Rolfe. There was one couple species that had positive association among seven main species composition in area study, that was C. odorata with kayu kapur. Generally, the other couples species had negative association, so there was no tolerance to exist in the same area and no mutualism interrelationship especially in habitat grouping.© 2008 Jurusan Biologi FMIPA UNS SurakartaKey words: Palaquium sp., domination, species association, Tangkoko Nature Reserve

Kurniawan A, Wibawa IPAH, Adjie B (2011) Species diversity of Amorphophallus (Araceae) in Bali and Lombok with attention to genetic study in A. paeoniifolius (Dennst.) . Amorphophallus belongs to Araceae family that consists of more than 170 species worldwide and distributed predominantly in tropical countries, especially in Asia and Africa. The study of Amorphophallus in Bali and Lombok Islands had been conducted to reveal its diversity. Genetic study was also conducted among Amorphophallus paeoniifolius species to recognize the variation within the species. The fieldworks showed three species Amorphophallus distributed in Bali, notably A. muelleri Blume, A. paeoniifolius (Dennst.) Nicolson, A. variabilis Blume and two species in Lombok, notably A. muelleri and A. paeoniifolius. Var. hortensis and var. sylvestris were two varieties of A. paeoniifolius that commonly found either in Bali or in Lombok. Genetic study on A. paeoniifolius indicated that there was no genetic variation in cpDNA region of trnL-F IGS within the species.

The research of tree species distribution along the environmental gradients in Lowland Tropical Rainforest Pananjung Pangandaran Nature Reserve had been conducted. The study aimed to elucidate the relationship between tree species distribution with ≥10 cm dbh and some measured environmental gradients, namely soil pH and moisture, soil depth, litter thickness, light intensity, altitude, slope, and the distance of plot from coastal line. A number of 125 of 10x10 m 2 quadrats were established randomly in four transects. The results indicated that Rhodamnia cinerea was the species having the highest presence. Ordination technique using Canonical Correspondence Analysis (CCA) suggested that tree species were less evenly distributed along the measured environmental factors with Eigenvalue 0,387. Altitude was the most important environmental factor affected tree species distribution, soil moisture as well as light intensity.

No abstract

A new species of Begonia sect. Reichenheimea, B. bimaensis Undaharta & Ardaka, is described from Mt Muria in Bima District, Sumbawa Island, Indonesia. The species is a narrow endemic, currently known from only one population, and has been assessed as Vulnerable using IUCN criteria.