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All Journal JURNAL TEKNOLOGI LINGKUNGAN REINWARDTIA BERITA BIOLOGI

Ruddy Polosakan, Ruddy

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Author-ID : 547056

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Environmental Science

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PHYTOSOCIOLOGICAL STUDY OF THE MONTANE FOREST ON THE SOUTH SLOPE OF MT. WILIS, EAST JAVA, INDONESIA Purwaningsih, Purwaningsih; Polosakan, Ruddy; Yusuf, Razali; Kartawinata, Kuswata
REINWARDTIA Vol 16, No 1 (2017): Vol.16 No.1
Publisher : Research Center for Biology

PURWANINGSIH, POLOSOKAN, R., YUSUF, R. & KARTAWINATA, K. 2017. Phytosociological study of the montane forest on the south slope of Mt. Wilis, East Java. Indonesia. Reinwardtia 16(1): 31 - 45. âA phytosociological stud y of a montane forest was carried out on the south slope of Mount Wilis, Kediri, East Java. The objective of the study was to do quantitative measurements of floristic composition and structure of the montane forest located within the seasonally dry climatic region as to date no such study has been undertaken there. It was conducted using the quadrat method by establishing plots of 2500 m2 each at five locations at the altitudes of 1100 m asl (above sea level), 1200 m asl, 1300 m asl, 1400 m asl and 1500 m asl, thus the total area sampled was 1.25 ha. They were Plot1100 at Bekayang, Plot1200 at Bukit Bendera, Plot1300 at Batutulis, Plot1400 at Mergosepi and Plot1500 at Brak. A total of 1045 trees comprising 74 species of 50 genera and 33 families were recorded. Based on a species constancy index of 100 %, the Saurauia nudiflora-Weinmannia blumei association was established. The association consisted of (1) the Cyathea-Polycias subassociation, representing the heavily disturbed forest, currently dominated by Cyathea contaminans and (2) the Villebrunea-Syzygium subassociation, representing the least disturbed forests, dominated by Syzygium lineatum and Villebrunea rubescens. The lowest number of species (13) was recorded in Plot1100 and the highest number (39) in Plot1300. Important species recorded included Cyathea contaminans (Importance Value, IV= 47.97); Lithocarpus sp. (IV= 22.07); Lithocarpus sundaicus (IV= 14.05); Saurauia pendula (IV= 12.85); Villebrunea rubescens (IV= 12.12) and Syzygium lineatum (IV= 11.22). Diameter measurements showed that 76.60 % of trees in Plot1100 and 86.60 % in Plot1200 consist of small individuals with diameters between 10 and 30 cm. Trees with large diameters of >30 cm occurred in Plot1300, Plot1400 and Plot1500. The presence of large numbers of small trees and lesser numbers of trees with large diameters in a forest stand indicated that the stand was regenerating after heavy disturbance. The presence of the majority of trees with height of < 20 m (99 %) further confirmed the forestâs dynamic status.Â

KEANEKARAGAMAN JENIS POHON DI KAWASAN CAGAR ALAM DUNGUS IWUL, JASINGA, BOGOR [Tree Biodiversity in Dungus Iwul Nature Reserve, Jasinga, Bogor] Polosakan, Ruddy; Alhamd, Laode
BERITA BIOLOGI Vol 16, No 2 (2017)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Dungus Iwul Nature Reserve is one of the remaining conservation areas in Java and has an unique vegetation. Study on tree biodiversity was carried out in one hectare permanent plot. The results showed that there were 78 species of 35 families and 63 genera with 1219 trees per hectare. The species of Orania sylvicola was very dominating the region, with high distribution (Frequency = 100%) and the total basal area (basal area relative; BA = 50.96%). Species of O. sylvicola (Important Value; IV = 129.48%) highly covered the area, followed by Mischocarpus sundaicus (IV = 19.93%), Diospyros frutescens (IV = 9.67%), Ficus variegata (IV = 9.38%) and Knema laurina (IV = 8.51%). Family with largest number of species was Euphorbiaceae (11 species), followed by Lauraceae (7 species) and 4 species of Fabaceae, Meliaceae and Rubiaceae.

ESTIMASI BIOMASA DAN KARBON TERSIMPAN PADA Pinus merkusii Jungh. & de Vriese DI HUTAN PINUS GN. BUNDER, TN. GN. HALIMUN SALAK [Biomass Estimation and Carbon Stock on Pinus merkusii Jungh. & de Vriese In Pine Forest At Bunder Mount, Gunung Halimun Salak National Park] Polosakan, Ruddy; Alhamd, Laode; Rahajoe, Joeni S.
BERITA BIOLOGI Vol 13, No 2 (2014)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

A study on the biomass and carbon stock estimation of Pinus merkusii Jungh. & de Vriese plantation has been conducted on 17-years and 30-years old pine forest in Gunung Bunder, Halimun Salak National Park. The method used was the allometric with non destructive technique. The results showed that pine trees density of 30-years old pine was 542 trees ha-1 ; the basal area (BA) was 26.8 m2 ha-1; trees density of 17-years old pine was 1,398 tree ha-1 with BA was 36.2 m2 ha-1. The estimation of biomass, carbon sinks and CO2 sequestration of 30-years old pine were 203.7, 96.5 and 354.2 ton ha-1, respectively. Meanwhile, the estimation of biomass, carbon sinks and CO2 sequestration of 17-years old pine were 188.3, 86.8 and 318.5 ton ha-1, respectively. Value of the environmental services derived from the CO2 absorption for the development of a pine forest ranged from US.$ 1,847.09 to 2,054.22, at two ages of pine trees.

EKOLOGI HUTAN GAMBUT DITAMAN NASIONAL TANJUNG PUTING, KALIMANTAN TENGAH Mirmanto, Edi; Polosakan, Ruddy; Simbolon, Herwint
BERITA BIOLOGI Vol 5, No 3 (2000)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Ecological studies of peat-swamp forest was conducted in the Tanjung Puting National Park,Central Kalimantan. One-hectare permanent plot has been establishes in order to describe the forest structure and floristic composition. Within 1-ha plot 141 species of tree (dbh >10 cm) and saplings (dbh 5-10 cm) belongs to 84 genera and 43 families recorded. Glutta wallichii, Neoscortechinia philippinensis and Gonystyllus bancanus were dominant tree species, whereas Baccaurea racemosa was very dominant for sapling stage.Trees density 2 2 was 728 /ha with basal area of 43.01 m /ha whereas density of sapling was 904 /ha with basal area of 3.8 m /ha. Most (30.7 %) of trees with dbh 10 - 30 cm and only 2.23 % of them reach up to dbh > 50 cm. There are three canopy layers that are I-layer was 26.8-33.6 m,II-layer was 17.8-26.8 m and Ill-layer was 9.8-17.6 m high.

KOMPOSISI JENIS DAN STRUKTUR VEGETASI HUTAN DI KAWASAN SUAKA MARGASATWA CIKEPUH, SUKABUMI Ã¢â‚¬â€œ JAWA BARAT Polosakan, Ruddy
Jurnal Teknologi Lingkungan Vol. 11 No. 2 (2010)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

A study on the structure and composition of trees species was carried out in CikepuhÃ‚Â Game Reserve. The informations and data on forest ecosystems of Cikepuh GameÃ‚Â Reserve was still very limited. Method of study used point centered quarter. The resultsÃ‚Â of study recorded total species number was 55 species of trees consisted of 35 generaÃ‚Â and 26 families, while saplings (Belta) recorded was 51 species consisted of 34 generaÃ‚Â and 23 families.The common species of trees in the area were Vitex pinnata (ImportantÃ‚Â Value = 53.37%), Alseodaphne cunneata (IV = 44.12%), Aporosa microcalyx (IV =25.88%) and Helicia robusta (IV = 24.38% ), while saplings were Vitex pinnata (IV =27.82%), Dillenia aurea (IV = 27.11%), Microcos tomentosa (IV = 25.72%), Aporosa microcalyx (IV = 23.10%) and Phyllanthus emblica (IV = 21.62%).Key words : structure, composition, trees species, Cikepuh Game Reserve

Co-Authors Alhamd, Laode Edi Mirmanto, Edi Herwint Simbolon, Herwint Kuswata Kartawinata Purwaningsih - Rahajoe, Joeni S. Yusuf, Razali

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