INTISARIKeberadaan tumbuhan bawah sebagai akibat adanya bukaan tajuk merupakan keuntungan tersendiri bagi ekosistem lokal termasuk penyediaan nutrisi bagi tegakan yang ada. Penelitian ini bertujuan mengidentifikasi dampak keterbukaan tajuk terhadap keragaman tumbuhan bawah. Metode pengambilan data dilakukan menggunakan line transect dengan plot 2 m × 2 m dengan arah memotong garis kontur pada tegakan Pinus oocarpa, Agathis alba, dan hutan alam sebagai pembanding. Hasil penelitian menunjukkan bahwa keragaman tumbuhan bawah pada semua tegakan tergolong tinggi, dimana indeks keragaman pada tegakan KATA KUNCI tumbuhan bawah indeks keragaman tutupan tajuk tegakan pinus tegakan agathis

Citarum watershed is a region of approximately 6,610 km2 in West Java, Indonesia. Citarum watershed has been degraded through historical land use and vegetation clearing. Rehabilitation of Citarum watershed uses Indigofera tinctoria L. that has value as a source of natural blue dye and is considered suitable for the region. Species distribution modelling and Habitat suitability index (SDM/HSI) were undertaken for I. tinctoria. The occurrence and environment data (bioclimatic, topography, and soil type) were input to HSI. Results of the Indigofera tinctoria habitat suitability model in Citarum watershed are very good (0.9–1) for some parts of the Citarum watershed. The medium and high suitability areas were respectively 4.49% and 4.37% of the area were located in the lowlands (Bekasi Regency and Karawang Regency). Prediction based on climate modelling for 2050 and 2070 estimated that the medium-high suitability area of Indigofera tinctoria will be reduced relative to the present.

Abstract. Witono JR, Usmadi D, Wihermanto, Purnomo DW, Safarinanugraha D, Pakiding Y, Netoseso N. 2020. Autecology of Drosera burmanni in the Wolobobo Botanic Gardens, Ngada District, Flores Island, Indonesia. Biodiversitas 21: 2137-2145. Drosera burmanni Vahl is a native carnivorous plant from tropical and subtropical Asia to the West Pacific, including Flores Island. During the botanical survey, a small population of the species was found in a limited area in the Wolobobo Botanic Gardens, Flores Island. Conservation of the species is necessary, since the habitat might be developed for the botanic gardens infrastructure. This research aims to study the autecology of D. burmanni, including environmental preferences and its associated species. Thirty plots with 2 x 2 m each were made to recognize its associated species and the pattern of its population distribution and its soil requirements. In the Wolobobo Botanic Gardens, D. burmanni flourishes with an average annual rainfall of 1835 mm; a temperature of 12.50-26.2° C; 48-99% humidity; at an altitude of 1489-1491 m asl.; a soil pH of 6.66, which contains very high C-organic, a high C/N ratio, moderate N total, K2O, P2O5, low CEC, and very low K, Na, Ca, Mg, and BS. Drosera burmanni displays a density of 8.5 individuals per m2 and is associated with 20 species, which belong to 19 genera and 9 families. The species has a clustering pattern and a positive association with Erigeron sumatrensis, Spinifex littoreus, and Imperata cylindrica. To conserve D. burmanni in the Wolobobo Botanic Gardens, it is necessary to designate its natural habitat as an in situ conservation area.

Ecological study of epiphytic ferns growing on bamboo species in Bogor Botanic Gardens, a man-made ecosystem located in a wet lowland area was carried out. The 350 phorophytes of 35 bamboo clumps belonging to 9 species and 3 genera were observed. Each culm was divided into intervals of 1 m from ground level to a height of 3 m. A total of 1984 individuals belonging to 12 species, nine genera, and six families of epiphytic ferns were recorded, with the highest species richness in Polypodiaceae (7 spp.). Dendocalamus giganteus Munro was the best host for epiphytic ferns (9 spp.). Two dominant species, Asplenium nidus L. and Davallia denticulata (Burm.f.) Mett. ex Kuhn with the same frequency value (97.14%), and relative species abundance of 31.49 individuals per clump and 14.94 individuals per clump, showed the highest Importance Value Index (IVI) of 83.19 and 54.00%, respectively. The first one-meter level of bamboo culms hosted all the species. Pyrrosia piloselloides (L.) Price was the only species that grew until the highest intervals of height with a decreasing frequency from the bottom. Bangladesh J. Bot. 50(4): 1095-1107, 2021 (December)

Taman Wisata Alam Bipolo merupakan salah satu tipe hutan kering luruh daun di Pulau Timor yang masih tersisa. Pengelolaan kawasan diperlukan informasi dan data tentang keanekaragaman tumbuhan serta potensi cadangan karbon di kawasan hutan tersebut. Tujuan penelitian untuk mengetahui keanekaragaman tumbuhan dan cadangan karbon di Taman Wisata  Alam Bipolo, Kabupaten Kupang. Pengambilan data menggunakan metode transek dengan subplot contoh berukuran 2 x 2 meter (semai), 5 x 5 meter (pancang), 10 x 10 meter (tiang), dan 20 x 20 meter (pohon).  Analisis peran penting jenis menggunakan Indeks Nilai Penting, keanekaragaman jenis menggunakan Indeks Keanekaragaman Jenis (Shannon-Wiener Indeks) dan Indeks Kemerataan Jenis. Biomassa pancang, tiang dan pohon dihitung dengan menggunakan persamaan allometrik dan nilai cadangan karbon setengah dari nilai biomassa.  Jenis yang mempunyai peran penting tertinggi di Taman Wisata Alam Bipolo berupa Mallotus sp. (semai), Chisocheton lasiocarpus (Miq.) Valeton (pancang dan tiang), dan Syzygium littorale (Blume) Amshoff (pohon). Keanekaragaman tumbuhan pada tingkat semai, pancang, tiang dan pohon di Taman Wisata Alam Bipolo termasuk kategori sedang dan tingkat kemerataan jenis yang tinggi. Biomassa rata-rata sebesar 228,93 ton/ha dan cadangan karbon sebesar 114,46 ton/ha.

No abstract

Abstract. Usmadi D, Witono JR, Lestari R, Widyatmoko D, Magandhi M, Robiansyah I, Rachmadiyanto AN, Purnomo DW, Zulkarnaen RN, Rivai RR, Helmanto H, Yudaputra A, Damayanti F. 2020. Plant diversity and composition at three Imperata grasslands in Bogor, Katingan, and Kupang, Indonesia. Biodiversitas 21: 2804-2813. Imperata grassland is among the largest proportions of marginal lands in Indonesia. Despite the dominance of Imperata cylindrica grass, certain plant species are able to compete and live together with this species, suggesting window of opportunity that the grasslands can be restored. Yet, the existing diversity and composition of plants in Imperata grasslands may vary due to differences in climatic and soil conditions. This study aims to determine the plant diversity and composition at three Imperata grasslands in Bogor, Katingan, and Kupang, Indonesia. Data were collected using systematic sampling by establishing quadratic observation plots with size of each plot was 1 x 1 m2. The total number of species found in Imperata grasslands in those three study sites was 81 species, belonging to 68 genera and 30 families. In the Bogor site, the dominant species were Imperata cylindrica, Ageratum conyzoides, and Phyllanthus niruri, while in the Katingan site was dominated by I. cylindrica, Scleria ciliaris, and Cyanthillium cinereum and in the Kupang site was dominated by I. cylindrica and Tridax procumbens. The Imperata grassland in Bogor had low species richness, moderate species diversity, the abundance distribution of each species tends to be uniform, and the occurred species did not tend to dominate. The Katingan and Kupang Imperata grasslands had low species richness, low species diversity, the abundance distribution of each species tends to be uneven, and were more dominated by I. cylindrica. Controlling abundance of I. cylindrica is required in those three research sites in order to stimulate the growth of other plant species, which is in turn to maintain and restore biodiversity.

There is a huge potential of upland for developing food crops to shortage the increase in rice production in Indonesia. Upland rice that adaptable to dry land could support national rice production. Among the limit factors of upland rice productivity in Indonesia are infertile land and cultivation practices. The purpose of the study was to find out the effect of microbial inoculant application combined with nitrogen (N) fertilizer dosage to the cultivation of upland rice Inpago LIPI Go4. The factorial experimental design with two factors was applied, namely the supply of microbial inoculant and the dosage of N fertilizer and, i.e., 0%, 50%, 100% N (200 kg ha-1 Urea). The inoculant comprises of Aspergillus niger, Trichoderma viride, and Azotobacter. Each treatment combination was repeated four times. The microbial inoculant treatment solely effects significantly plant height, tiller number, and panicle weight of the upland rice, whereas N dosage treatment solely influences significantly plant height and tiller number. There was no interaction significant effect of microbial inoculant and N fertilizer dosage to all growth, production, and content of leaf N parameters. The maximum production of the upland rice was 4499 kg ha-1, whereas the average production was 3816 kg ha-1 grain weight. The highest yield was obtained from the plant with the supply of microbial inoculant and the treatment of 50% N fertilizer (100 kg ha-1 Urea).