I Nyoman Lugrayasa
UPT Balai Konservasi Tumbuhan Kebun Raya "Eka Karya" Bali, LIPI Candikuning, Baturiti, Tabanan Bali 82191

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Association of Spheranthus africanus (Asteraceae) with other Weeds In a Fallowed Rice Field Priyadi, Arief; Wibawa, I Putu Agus Hendra; Lugrayasa, I Nyoman
Proceeding International Conference on Global Resource Conservation Vol 4, No 1: Proceeding of 4th ICGRC 2013
Publisher : Proceeding International Conference on Global Resource Conservation

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Abstract

Spheranthus africanus is a minor weed of rice, which can be utilized for various purposes. It can be used for phytoremediation of soil contaminated with Pb and also reported to have anti-bacterial activity to be used as natural pesticides. However, because of its minority status little is known about this species in its natural habitat. This study was aimed to understanding the relationship between S. africanus with other weed species in a fallowed paddy field in Tabanan District, Bali, Indonesia. Vegetation analysis by quarter method was done in the rice field, where the species had occurred, in 2011 and 2012. Determination of association type between S. africanus with other weed was conducted by using 2x2 contingency table to calculate χ2, association coefficient (AC) and Ochiai index (OI). The result shows that the Shannon diversity index in this same area for the two consecutive years were 2.06 and 2.48 with species richness of 22 and 27 respectively. Calculation of Summed Dominance Ratio (SDR) showed that the species composition was not evenly distributed, in other words some species dominated others. In terms of association, although S. africanus mainly has no association with most of the weed species in the field, it prominently has positive association with Lindernia ciliata, and Digitaria ciliaris, with no significant negative association. Keywords: diversity, species association, Spheranthus africanus
STUDI ANGGREK EPIFIT PADA TIGA LOKASI DI KABUPATEN MALINAU, KALIMANTAN TIMUR Tirta, I Gede; Lugrayasa, I Nyoman; Irawati, Irawati
Buletin Kebun Raya Vol 13, No 1 (2010): Buletin Kebun Raya Vol. 13 (1) Januari 2010
Publisher : Center for Plant Conservation Bogor Botanic Garden, Indonesian Institute of Sciences

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A study on epiphytic orchids in three locations (Senturan Forest, Mount Sidi and Mount Jarang) in Malinau District showed that most epiphytic orchids were found in location with moderate light intensity rather than in low and high light intensities. Many orchids were found on parts of trees covered by thin mosses rather than on thick mosses. Three hundred and seventy one orchid specimens were collected from the three locations and at least 71 specimens were new collections to Eka Karya Botanic Garden, Bedugul.
STUDI ANGGREK EPIFIT PADA TIGA LOKASI DI KABUPATEN MALINAU, KALIMANTAN TIMUR Tirta, I Gede; Lugrayasa, I Nyoman; Irawati, Irawati
Buletin Kebun Raya Vol 13, No 1 (2010): Buletin Kebun Raya Vol. 13 (1) January 2010
Publisher : Center for Plant Conservation Bogor Botanic Garden, Indonesian Institute of Sciences

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A study on epiphytic orchids in three locations (Senturan Forest, Mount Sidi and Mount Jarang) in Malinau District showed that most epiphytic orchids were found in location with moderate light intensity rather than in low and high light intensities. Many orchids were found on parts of trees covered by thin mosses rather than on thick mosses. Three hundred and seventy one orchid specimens were collected from the three locations and at least 71 specimens were new collections to Eka Karya Botanic Garden, Bedugul.
STUDI ETNOBOTANI TIGA PASAR TRADISIONAL DI KABUPATEN TABANAN BALI Sujarwo, Wawan; Lugrayasa, I Nyoman; Kuswantoro, Farid
BERITA BIOLOGI Vol 17, No 3 (2018)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

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Abstract

The trade process makes traditional market able to become a pool of traditional knowledge for various local wisdoms that develop in the local community, including the use of plants. This study aims to document the traditional uses of plant species traded in three traditional markets in Tabanan regency. Data collection was carried out by semi-structured interview toward 64 traders of Baturiti, Marga, and Tabanan traditional markets, respectively. Data analysis was performed quantitatively by calculating the use value index, and some ecological indices, such as diversity index, margalef index, pielou index, sørensen index, cluster analysis, and principal component analysis. Qualitative analysis was also used to tabulate and presented the data into tables and figures. The study documented 52 plant species belonging to 48 genera and 30 families. Herbs are the most widely used habitus, and Zingiberaceae is the most widely used plant family. The most widely used use-category is condiments, and Cocos nucifera is a plant species with the highest use-value. The study also showed a highly plant diversity, which is traded in each market, with slightly different similarities. Cluster analysis and PCA showed that there is a little difference in plants species traded in three traditional markets. Differences in altitude may affect the diversity of plant species traded, including the buyers preference (community).
Studi Ekologi Kuantitatif Hutan Pilan Sebagai Dasar Pengembangan Kebun Raya Gianyar Kuswantoro, Farid; Lugrayasa, I Nyoman; Sujarwo, Wawan
Jurnal Ilmu Kehutanan Vol 12, No 2 (2018)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6936.418 KB) | DOI: 10.22146/jik.40147

Abstract

Penelitian ekologi kuantitatif diperlukan sebagai baseline dalam proses pembangunan dan pengembangan kebun raya di masa mendatang. Penelitian ini bertujuan untuk mendapatkan data vegetasi di kawasan hutan yang akan dibangun kebun raya dan menganalisisnya secara kuantitatif. Penelitian dilakukan dengan metode petak kuadrat (PU), dengan petak ukur 20 m x 20 m untuk pengamatan tingkat pohon dan tiang, serta 2 mx 2 m untuk pengamatan tingkat tumbuhan bawah. Analisis data dilakukan mengunakan indeks nilai penting, indeks keanekaragaman ShannonWiener, indeks similaritas, analisis kluster, dan analisis komponen utama (PCA). Komunitas tumbuhan di hutan Pilan didominasi oleh Magnolia montana (Blume) Figlar dan Arenga pinnata (Wurmb) Merr. pada tingkat pohon serta Daemonorops sp. pada tingkat tumbuhan bawah. Indeks keanekaragaman pada tingkat pohon dan tiang menunjukan nilai sedang dan rendah pada tingkat tumbuhan bawah, sementara indeks similaritas mayoritas kombinasi PU adalah rendah. Hasil kluster menunjukan terbentuknya dua subset pada kedua tingkat pertumbuhan, dimana PU VI berada di luar kluster sedangkan PCA menunjukan setiap PU mendukung jenis tumbuhan yang berbeda-beda. Hasil penelitian ini menyimpulkan bahwa komposisi vegetasi hutan Pilan mendekati klimaks yang disebabkan karena statusnya sebagai hutan keramat sehingga relatif bebas dari gangguan. Faktor-faktor yang diduga mempengaruhi perbedaan komposisi tumbuhan di setiap PU adalah pH tanah, intensitas sinar matahari, jenis pohon yang dominan, efek tepi, dan persebaran bijioleh hewan.Quantitative Ecological Study of Pilan Forest as a Baseline for Development of Gianyar Botanic GardenAbstractQuantitative ecological research is needed as a baseline in the future construction and development of botanic gardens. This study aims to acquired the vegetation data in the forest area where a botanic garden will be established and analyse it quantitatively. The study was conducted using the quadrat plot (PU) method, with a plot measuring 20 m x 20 m for observation and tagging of all trees and saplings, as well as 2 mx2 m for observation of the understorey level. Data analysis was performed by utilising the importance value index, Shannon-Wiener diversity index, similarity index, cluster analysis, and principal component analysis (PCA). Plant communities in Pilan Forest were dominated by Magnolia montana(Blume) Figlar and Arenga pinnata(Wurmb) Merr. at the canopy level and Daemonorops sp. in the understorey level. The diversity index was moderate and low respectively, while the similarity index was mostly low. The clustering results showed the formation of two subsets in both growth rate as the PU VI was outside the cluster and the PCA indicated that each plot supports different plant species. The study results concluded that the composition of vegetation at Pilan forest is approaching the maximum diversity, and is relatively undisturbed due to its status as a sacred forest. Factors thought to affect the different composition of plants in each plot was the pH of the soil, the intensity of sunlight, dominant tree species, edge effects and distribution of seeds by animals.
Pengaruh Konsentrasi Pupuk Cair (Mikroba Fungsional Tahan Salin) Terhadap Perkembangan Stek Daun Begonia rex “Silver Circle” WIBAWA, I PUTU AGUS HENDRA; LUGRAYASA, I NYOMAN
Jurnal Agroekoteknologi Tropika (Journal of Tropical Agroecotechnology) Vol.8, No.2, April 2019
Publisher : Program Studi Agroekoteknologi, Fakultas Pertanian, Universitas Udayana

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 The Effect Of Liquid Fertilizer Concentration On Growths Of Leaf Cuttings Begonia Rex "Silver Circle"   Begonia is one of the large genera in the Angiosperm group with asymmetrical leaf characteristics that are very suitable for ornamental plants. "Silver Circle" is the most popular type of Begonia rex. To ensure the availability of Begonia plants in large quantities, there is a need for propagation and cultivation.  The success of plants propagation by cuttings is influenced by various factors, namely the type of cuttings and environmental factors including temperature and light humidity and nutrients from the growing media. The quality of planting media can be improved by functional microbial liquid fertilizer. Liquid fertilizer containing microbes functional can produce nutrients and growth hormones that can support plant growth. This study aims to determine the effect of liquid fertilizer concentration given, and also to determine the optimal liquid fertilizer concentration on the growth of B. rex leaf cuttings "Silver Circle". The treatment of liquid fertilizer gave significantly different results from controls on the parameters of leaf area and plant height. The most optimal dose of liquid fertilizer is 300 mL/L.