Study on invasive alien species was conducted in Gunung Gede Pangrango National Park, Bodogol Resort. Vegetation analyses in two different heights location was carried out by making of plots. First location was established at 700 m a.s.l., while second site was located at 800 m a.s.l., with 0.14 ha each plot. The result showed 10 trees species of 7 families and 29 saplings species of 14 families was found in the fi rst plot, whereas 12 trees species of 10 families and 48 saplings species of 28 families was located in the second plot. Three invasive species which threatened ecosystem in this study region were Maesopsis eminii, Calliandra calothyrsus and Austroeupatorium inulifolium.

No abstract

Keanekaragaman tumbuhan tidak hanya terlihat secara morfologi, tetapi dapat dibedakan pula secara anatomi. Ciri anatomi dapat digunakan sebagai pendukung dan penguat pengklasifikasian jenis tumbuhan. Penelitian ini bertujuan untuk mengetahui ciri anatomi daun yang dapat digunakan sebagai penciri taksonomi dalam suatu tingkatan taksa melalui perwakilan jenis. Jenis yang digunakan berjumlah 15, yang merupakan perwakilan dari 12 suku tumbuhan berbunga Indonesia. Metode parafin digunakan untuk mendapatkan penampang transversal dan metode perendaman dengan asam nitrit (HNO3) digunakan untuk mendapatkan penampang epidermis daun. Sebagian ciri anatomi pada penelitian dapat digunakan sebagai penciri suku hingga jenis. Hasil penelitian menunjukkan bahwa 15 jenis yang diamati memiliki kesamaan ciri anatomi dengan data penelitian terdahulu yang telah dilakukan baik pada tingkat suku, marga maupun jenis. Kesamaan ciri anatomi tersebut mencakup satu hingga beberapa ciri seperti tipe stomata, dinding antiklinal sel epidermis, jaringan mesofil, dan berkas pengangkut (tangkai daun dan tulang tengah daun). Kesamaan ciri yang didapatkan pada masing-masing jenis menunjukkan bahwa ciri pada struktur anatomi daun dapat menjadi bukti pembatasan takson pada tumbuhan berbunga.

Abstract. Sulistyawati E, Tihurua EF. 2019. Analysis of the condition of forest interior and edge in Mount Papandayan, West Java, Indonesia based on floristic composition and structural characteristics of tree community. Biodiversitas 20:  900-906.  Forest fragmentation creates forest edges that possess different biotic characteristic in comparison to its interior. Those differences may include difference in vegetation structure and composition, and ecological processes in the ecosystem. This study aims to compare the condition between forest interior and forest edge in Mount Papandayan and provide assessment of the overall condition of the forest based on its floristic and structural characteristics. We conducted vegetation analysis of tree in which six plots, each of 0.1 ha, were established in the forest interior and forest edge. Based on the results, species richness and diversity of tree were higher in the forest interior than the forest edge. Based on the importance value index, the proportion of co-dominant species in forest edge sites were higher than in the forest interior sites. In addition, tree density, regeneration potential, total basal area, wood density average, and biomass were higher in the forest interior than in the forest edge. Overall, Mount Papandayan suffers moderate disturbance, which follows through the intermediate disturbance hypothesis and this can be seen from its relatively high diversity index of tree yet it has moderate wood density average.

Three variations of Arundina graminifolia flowers have been recognized, (1) group of big flower with reddish violet lip and purplelish white sepals and petals (2) group of small flower with white lip and white sepals and petals (3) similar to second variation but with purple color on the lip apex. In order to clarify the taxonomy status of those three variations, a leaf anatomical study had been carried out. Results of this study showed that there were some differences among them in trichome shape and number mesophyll layers. Big flower group of Arundina has trichome club shape and thick mucous in the apex with mesophyll layer 9-11; for small flower group has white lip, trichome club shape, thick mucous and granulate in the apex, but only 2 mesophyl layers; whereas for other small flower group with purple lip has trichome cup shape and 10-13 layers of mesophyll. Based on the differences in flower size and their color variation, and combined with leaf anatomical study, we suggested the three variations of A. graminifolia should be in separated groups.

Four species of Impatiens were collected from Mt. Singgalang, West Sumatra, Indonesia, namely I. singgalangensis Grey-Wilson, I. buennemeijeri Grey-Wilson, I. delectans Rild., and I. diepenhorstii Miq., of which the last three were collected in this mountain for the first time. I. buennemeijeri where previously reported to be endemic to Mt. Malintang, Likewise, I. delectans and I. diepenhorstii were reported as Mt. Kerinci endemics but are successfully collected here in the forests of Mt. Singgalang. Here descriptions, illustrations, and preliminary conservation status of those species are provided.

Mangrove is an essential ecosystem that are located in the transition area of fresh and sea water. Therefore, species that grow are typical species that are able to adapt to the saline environment. The aim of this research is to characterize leaf anatomical structure for every species that compose the communities found in each mangrove zonations, including their similarities and dissimilarities characteristic. Sampling of examined leaf was carried out in the mangrove areas of Peling Island and Bakalan Island by making plots in four sites of the mangrove ecosystem area. Methods for leaf anatomical preparations were carried out using the paraffin-tert-butanol and paradermal sections. Anatomical characters as an adaptation to saline habitat are found in all species of mangrove plants, including thick cuticle and epidermal cells, thick leaves and water-storage tissue (hypodermis). In addition, there is found the presence of cork warts and sclereid as characteristic of the genus Rhizophora. Based on quantitative character observations, the mesophyll (palisade to sponge) ratio range from 0.28 ± 0.04 μm to 1.19 ± 0.42 μm, leaf thickness ratio 289,41 ± 38,21 μm to 695,20 ± 97,50 μm and the highest stomata density is owned by Lumnitzera littorea

Wood density is the functional character which has important role in the function of ecosystem. Stem and branch wood density have different trait and effect on its ecosystem processes. The objectives of this research are to know the diversity of stem and branch wood density and to analyze whether branch wood density could be used to estimate stem wood density in the Mount Papandayan. Six plots of 0.1 ha at different sites (three plots each in interior and edge forest) were established. Branches were collected from trees with diameter at breast height larger than 10 cm, while stem wood density data were obtained from some wood density sources. Research results showed that stem wood density ranges were 0.35–0.82 g/cm3, while branch wood density ranges were 0.33–0.61 g/cm3. Average of branch wood density was lower (0.48 ± 0.09 g/cm3) than stem wood density (0.61 ± 0.1 g/cm3). Linear regression analysis indicated that branch wood density could be used to estimate stem wood density of trees in Mount Papandayan which is showed by R2 value and correlation coefficient of 0.28 and 0.55 (p value < 0.001) respectively.