Background Indonesian economy is sustained largely by domestic factors such as large

3 WORKING GROUP 1: FUNDAMENTAL ASSESSMENT FOR BIO-RESOURCES 1. Distribution pattern of Alstonia scholaris - a species contained rich medicinal substances - in different forest ecosystems Bambang Irawan, Iskandar Z. Siregar, Reiner Finkeldey 2. Radical scavenging activity of leafy amaranths as potential antioxidant sources Muhammad Ikhsan Sulaiman, Rita Andini 3. Yield Evaluation of 17 Chili Pepper Capsicum annuum L. Lines in Bogor, West Java Faradila Danasworo Putri, Muhamad Syukur, Syarifah Iis Aisyah 4. Current research development of in vitro embryo production on farm animal in Indonesia Mohamad Agus Setiadi 5. Carrageenan prototype food product development of seaweed at Cluster Salabangka Islands of Central Sulawesi Province Marhawati Mappatoba, Asriani Hasanuddin 6. Inventory of Dipterocarpaceae at Soraya Research Station, Leuser Ecosystem Area Iqbar, Essy Harnelly 7. Influence of different supplemental niacin levels on intake, digestibility and rumen fermentation of dairy cows: a meta-analysis Rossy E. A. Anggreini, Erika B. Laconi, Anuraga Jayanegara 8. Influence of tannin concentration in ration on fermentation parameters of Rumen Simulation Technique RUSITEC: a meta-analysis Anuraga Jayanegara, M. Ridla, Erika B. Laconi, Nahrowi 9. An observation on the scales of three species of Varanus using scanning electron microscopy Evy Arida 10. The potency of tropical endophytic bacteria as plant growth and biocontrol agents Abdul Munif 11. Effect of oxygen concentration on storage of sapodilla fruit Achras zapota l. Bambang Susilo, Rini Yulianingsih, Dyah Ayu Agustiningrum 12. Heavy metals and other elements concentration in Emilia sonchifolia grown in top and overburden of Serpentine soil from Sorowako, Indonesia A. Tjoa, H. Barus 4 Distribution pattern of Alstonia scholaris - a species containing rich medicinal substances - in different forest ecosystems Bambang Irawan 1, , Iskandar Z. Siregar 2 , Reiner Finkeldey 3 1 Forestry Faculty, University of Jambi, Indonesia 2 Forestry Faculty, Bogor Agricultural University, 16680, Indonesia 3 Institute of Forest Genetics, University of Goettingen, Germany Corresponding author: birawan1gwdg.de Abstract Alstonia scholaris L. R.Br Apocynaceae is an evergreen tropical. It is native to tropical and subtropical Africa, Central America, Southeast Asia, Polynesia and Australia. A. scholaris is a species with high economical and ecological values. It is fast growing species. The latex provides a good quality chewing gum; the bark is a source of fibers. A. scholaris also contains many chemical substances that are important both for traditional and modern medicines. It is reported to contain various alkaloids, coumarins, flavonoids, leucoanthocyanins, simple phenolics, steroids, saponins and tannins. Ecologically, A. scholaris also plays an important role in the forest succession processes. An investigation on the distribution pattern of A. scholaris was conducted in three ecosystems in Jambi, namely jungle rubber JR, close to primary forest CPF, and secondary forest SF. Six hectare plots have been developed in two lowland forest landscapes namely Senami Forest and Bukit Duabelas National Park BDNP. All trees above 10 cm were recorded following standard inventory method. The results showed that A. scholaris could be found in all ecosystems except CPF in BDNP with the highest dominancy in the CPF of Senami Forest 0.02840 followed by JR of BDNP and SF in Senami. The density value of A. scholaris varied among the ecosystems. The highest value was 0.0940 which could be found in SF followed by CPF in Senami and JR in BDNP. The total volume with the highest of 12.32 m3ha and frequency of 22 trees per hectare could be found SF in Senami. The mean diameter of A. scholaris varied from 17.86 cm to 31.18 cm that could be found in JR and SF in Senami respectively, while the tallest A. scholaris could be found in SF of Senami 10.50 m followed by JR in BDNP with the height of 10.40 m. Keywords A. scholaris, distribution pattern, different ecosystems, medicinal substances