BIODIVERSITAS ISSN: 1412-033X Volume 19, Number 6, November 2018 E-ISSN: 2085-4722 Pages: 2213-2218 DOI: 10.13057/biodiv/d190629 Short Communication: Trees species diversity and indicator species in Bedugul forest ecosystem, Bali, Indonesia SUTOMO ♥ , I DEWA PUTU DARMA, ARIEF PRIYADI, RAJIF IRYADI Bali Botan Gardens, Indonesian Institute of Sciences. Candikuning, Baturiti, Tabanan 82191, Bali, Indonesia. Tel.: +62-368-2033170, 2033170, Fax.: +62-368-2033171, ♥ email: tommo.murdoch@gmail.com, sutomo.uwa@gmail.com Manuscript received: 7 September 2018. Revision accepted: 9 November 2018. Abstract. Sutomo, Darma IDP, Priyadi A, Iryadi R. 2018. Trees species diversity and indicator species in Bedugul forest ecosystem, Bali, Indonesia. Biodiversitas 19: 2213-2218. Bedugul area is an endorheic basin landscape with 3 lakes namely, Beratan, Buyan, Tamblingan, which is surrounded by Bukit Mangu, Tapak and Lesung. Topography of the area shows sloping to steep slopes with altitude on the lake surface ± 1,100 m asl and the highest peak of Bukit Mangu 2002 m asl. Ecological studies have not been optimal so identification of comprehensive ecological potential is carried out. Measurement of tree vegetation diversity was carried out by Centered Quarter Method and important value ratio analysis and location elevation class. The results of the inventory of tree species diversity in the Bedugul Bali forest area recorded 35 species and 13 indicator tree species. From the number of indicator tree species in the Mangu hill forest area there are 5 types of Ficus sp, Platea latifolia, Polyosma integrifolia, Lindera sp. and Syzygium sp., Bukit Tapak forest area consists of 4 species, Casuarina junghuhniana, Acronychia trifoliate, Astronia spectabilis and Homalanthus giganteus, the forest area of Bukit Lesung consists of 4 types of Lophopetalum javanicum, Syzygium racemosum, Dysoxylum nutans and Dendrocnide peltata. Keywords: Bali, Bedugul, forests, Indicator species, R software Abbreviations: CT: Confined basin/Cekungan terkungkung; CB: Biosphere reserve/Cagar biosfer; MB: Lower Mangu/Mangu bawah; MT: Middle Mangu/Mangu tengah; MA: Upper Mangu/Mangu atas; TB: Lower Tapak/ Tapak bawah; LB: Lower Lesung/Lesung bawah; LT: Middle Lesung/Lesung tengah; LB: Lower Lesung/Lesung bawah INTRODUCTION Bedugul area is a highland area in the middle of Bali Island, where there are three lakes (Beratan, Buyan, Tamblingan), Ulun Danu Beratan Temple, and the ex-situ conservation area, Bali's "Eka Karya" Botanical Garden. The natural landscape of this area is an endorheic basin or a confined basin (CT), which is an area in the form of a concave container that has no outflow (Hehanusa 2005) surrounded by Bukit Mangu, Tapak and Lesung. The development of this area is required to be in harmony with the conservation function. In 2005, a symposium was held with the title "Analysis of Carrying Capacity and Capacity of Water Resources in the Beratan Lake, Buyan and Tamblingan Areas". In the symposium, the appropriate management of the area was proposed in the form of Biosphere Reserves (BR). According to Man And Biosphere-Indonesia, (2013), the Biosphere Reserve is a site designated by various countries through the collaboration of the MAB-UNESCO program to promote conservation of biodiversity and sustainable development, based on the efforts of local communities and reliable science. According to the Republic of Indonesia Law No. 5 of 1999, a biosphere reserve is an area consisting of native ecosystems, unique ecosystems, and / or ecosystems that have undergone degradation whose whole natural elements are protected and conserved for research and education. The concept is a combination of preservation of landscape diversity, ecosystems, biological and genetic alignment with economic development, and in harmony with local cultural wisdom (Darnaedi et al. 2005). On a national scale, Indonesia currently has 11 biosphere reserves, including the Cibodas Biosphere Reserve (1977), Komodo BR (1977), Lore Lindu BR (1977), Tanjung Putting BR (1977), Siberut Island BR (1981), Gunung Leuser BR (1981), Giam Siak Kecil-Bukit Batu BR (2009), Wakatobi BR (2012), Bromo Tengger Semeru-Arjuno BR (2015), Taka Bonerate-Kepulauan Selayar BR (2015), and Belambangan BR (2016) (MFA 2016). In relation to biodiversity in Bedugul, at the symposium in KREK in 2005, it was recommended that some native plants in the area could be reintroduced to restore function as a buffer zone. Some types found naturally include Cemara Pandak (Dacrycarpus imbricatus) and Cemara Geseng (Casuarina junghuhniana) (Sumantera 2004; Iryadi et al. 2017). Some species are rare and endemic species found in Bedugul forest areas such as Pinanga arinasae (Witono et al. 2002) and Dicksonia blumei (Darma et al. 2015). As one of the research activities in Bali's "Eka Karya" Botanical Gardens in 2010, we have made a permanent sampling plot of 1 ha (Sutomo 2015) at Pohen Hill, which