Sub-population survey of Dipterocarpus retusus Bl. in Mount Gede Pangrango National Park

Abstract

Dipterocarpaceae are globally important tree family due to its conservation status. Most of Dipterocarpaceae in Java are distributed in lowland area. However, several species exist in higher altitude such as Gede Pangrango National Park (GPNP) area. All Dipterocarpaceae species in GPNP are vulnerable or endangered based on IUCN Red List status. Dipterocarpaceae species are main priorities for plant conservation in GPNP. In this study we conducted early survey of Dipterocarpus retusus Bl. sub-population in Bodogol area (northwest slope of GPNP) at elevation 800-1000 m above sea level. We searched D. retusus individuals along trail in the Bodogol area from forest exterior towards forest interior. The subpopulation of D. retusus detected in mixed forests that dominated by emergent Fagaceae species (Castanopsis argentea). Positive correlation between diameter and height may reflect low disturbance rate in Bodogol forest area. We also found negative effect of habitat elevation toward plant height, which mean that the centre of sub-population located in the lower elevation part of the sampling location. This study signifies the importance of Bodogol forest area that contain globally important Red List plant species.

Variation in the Composition and Structure of Natural Lowland Forests at Bodogol, Gunung Gede Pangrango National Park, West Java, Indonesia

“…The present study, along with Helmy et al (2009) and Sadili (2014), has described the transitional forest area between the lowland and montane forests with tree species diversity that was not known when GGPNP was established in 1980. It is interesting to note that species of Dipterocarpaceae were reported to occur spa-ringly in Bodogol (Ismail et al, 2000;Helmi et al, 2009;Junaedi et al, 2020) but they were not found in the present study plots, possibly because of unsuitable microclimate and located far away from the seed producing mature trees (Purwaningsih, 2004).…”

“…The GGPNP was divided into several resorts (regions), including the Bodogol Resort (BR) for management purposes. BR covers planted forests, natural upper lowland forests with an elevation of < 1,000 m asl, and montane forests with an elevation > 1,000 m asl (Sadili et al, 2008;Sadili & Alhamd, 2012;Sadili, 2014;Junaedi et al, 2020). We know very little about the structure and composition of the lowland forests in GGPNP and to date only Helmi et al (2009), who had investigated a one-hectare plot of the upper lowland forest at Bodogol.…”

“…Therefore, more studies in the lowland forests are necessary to complement the montane and subalpine forest data for better scientifically based management of the GGPNP (Brearley et al, 2019). Species of Dipterocarpaceae can be found in the Bodogol lowland forest, including A nisoptera costata, Vatica sp., Dipetrocarpus hasseltii, D. retusus, D. gracilis (Ismail et al, 2000;Helmi et al, 2009;Junaedi et al, 2020). These species are listed as vulnerable by the IUCN (IUCN, 2013).…”

Dinamika Pertumbuhan Pohon Di Hutan Restorasi Bodogol Taman Nasional Gunung Gede Pangrango, Jawa Barat

“…Areal HR di TNGGP terdapat di Resort Nagrak, Resort Gunung Putri dan Resort Bodogol (Handayani et al,2019;Ario et al, 2020) Informasi struktur dan komposisi vegetasi di HA TNGGP telah banyak dilakukan dan dikompilasi oleh Kartawinata dan Sudarmonowati (2022). Untuk vegetasi di HA Bodogol di informasikan oleh Helmi et al (2009), Rozak et al (2016), Junaedi et al (2020) dan Sadili et al (2023a). Dan vegetasi HT Bodogol oleh Arifin (2011), Iskandar (2011), Raharjo (2011, Sadili dan Alhamd (2012), Sadili (2014) dan Sadili et al (2023b).…”

“…Penanaman kembali dilakukan di areal ruang-ruang kosong yang ditumbuhi semak belukar (Gambar 5). Selain jenis yang dapat merangsang hewan penyebar datang, jenis yang digunakan juga menggunakan jenis-jenis kunci, seperti dari famili Fagaceae atau Lauraceae, tetapi diutamakan dari famili Dipterocarpaceae karena di TNGGP famili tersebut berstatus terancam (Junaedi et al, 2020).…”