Plant diversity in logged over forest in Mahakam Ulu, East Kalimantan, Indonesia

Abstract

Abstract. Setiawan AW, Tjiu A, Meididit A, Iswinanto, Ginanjar A, Atut Y, Agusti R. 2021. Plant diversity in logged over forest in Mahakam Ulu, East Kalimantan, Indonesia. Biodiversitas 22: 4829-4838. A study of flora was conducted in the Ratah Timber concession area. Objectives of this study was to calculate the Importance Value Index (IVI) and identify species diversity in Mahakam Ulu, East Kalimantan. A survey was carried out in 128 plots within 13 transects placed purposively. Vegetation sampling was conducted using line transect and a quadrat method. As many as 530 species belonging to 79 families were found. Of these species, 420 species were found in observation plots with 374 of the species being tree. The most dominant tree species were Endertia spectabilis, Shorea pinanga and Shorea leprosula with IVI of 10.24%, 8.25%, and 6.96%, respectively. In total, 114 species or 21.5% are endemic species of Borneo. The Shannon-Wiener diversity index at tree level was 5.51 and at seedling level was 4.95. The highest Similarity Index was found between transects 23 and 21, meanwhile the lowest was between transects 05 and 15. This study found 61 species which are classified on the International Union for Conservation of Nature (IUCN) Red List (2020-1) as critically endangered (16), endangered (11), and vulnerable (34) species.

Sustainable Valorization of Wood Residue for the Production of Biofuel Materials Via Continuous Flow Hydrothermal Liquefaction

“…It has been reported that between 2000 and 2017, 6 million hectares of Borneo's forest were cut down to clear land for palm oil plantations and other agricultural and infrastructure developments. Despite local governments implementing countermeasures such as No Deforestation zones, the lack of transparency in reporting means that the island logging will carry on into the foreseeable future [30][31][32][33] . The Dipterocarpaceae trees are the most abundant family tree in Borneo's forests.…”

Floristic diversity and composition of heath forest in Kuala Tambangan Village, Tanah Laut District, Indonesia

“…The distribution of heath forests in Sumatra includes the Bangka and Belitung Islands (Oktavia et al 2015(Oktavia et al , 2021. In Indonesian Borneo (Kalimantan), heath forests occur in the provinces of West Kalimantan (Navratil 2013;Utari et al 2023), Central Kalimantan (Maimunah et al 2019;Kissinger 2022), East Kalimantan (Kartawinata 1980;Navratil 2013;Setiawan et al 2021), North Kalimantan (Agustiorini et al 2022) and South Kalimantan (Nugroho et al 2022b). Heath forests also occur in Brunei Darussalam (Din et al 2015;Ikbal et al 2023;Zaini and Sukri 2014) and Malaysian Borneo (Sabah and Sarawak) (Lim 2006).…”