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. —A 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 forest’s dynamic status.

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.

Fagaceae umumnya pohon, salah satu suku dengan jumlah jenis yang cukup besar ± 700 jenis di dunia tetapi sebagian besar tumbuh di belahan bumi utara. Di wilayah Malesia, ada lima marga yaitu Nothofagus, Castanopsis, Lithocarpus, Quercus dan Trigonobalanus dan jumlah jenis ± 180 dan sebagian besar di Indonesia tercatat 112 jenis. Penelitian ini dilakukan dengan studi literatur untuk menentukan keanekaragaman jenis Fagaceae di Indonesia serta distribusi dan pemanfaatannya. Fagaceae paling banyak tumbuh di Indonesia adalah marga Lithocarpus (60 jenis) dan Castanopsis (24 jenis), sementara Nothofagus (11 jen i s) sebarannya hanya di Papua. Distribusi jenis Lithocarpus paling di Sumatera (29 jenis) dan Kalimantan (26 jenis), sementara Castanopsis paling banyak di Kalimantan (15 jenis). Untuk Nusa Tenggara tidak ditemukan jenis-jenis Fag a cea e dan ke arah timur Indonesia semakin sedikit jumlah jenisnya, di Sulawesi dan Maluku hanya diketemukan satu jenis. Sebaran Fagaceae dipengaruhi oleh beberapa faktor, terutama tanah, iklim, dan ketinggian. Di Indonesia habitat tumbuh Fagaceae di hutan yang masih alami, tetapi ada beberapa yang mampu tumbuh di rawa seperti Nothofagus womersleyi. Berdasarkan ketinggian tempat (altitude) umumnya Fagaceae di hutan submontane dengan ketinggian 600 -1 50 0 m namun ada beberapa spesies yang mampu tumbuh hingga ketinggian >3000 m. Fagaceae yang memiliki sebaran luas (ditemukan di beberapa pulau) ada dua jen i s yaitu Castanopsis acuminatissima dan Lithocarpus elegans. Pada umumnya pemanfaatan Fagaceae adalah kayunya untuk bahan bangunan dan furniture teta p i ada jenis Castanopsis yang dapat dimakan bijinya dan selain itu kulit kayu mengandung tanin bisa untuk pewarna.

A study on the structure and composition of trees species was carried out in Cikepuh Game Reserve. The informations and data on forest ecosystems of Cikepuh Game Reserve was still very limited. Method of study used point centered quarter. The results of study recorded total species number was 55 species of trees consisted of 35 genera and 26 families, while saplings (Belta) recorded was 51 species consisted of 34 genera and 23 families.The common species of trees in the area were Vitex pinnata (Important 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

No abstract