Abstract. Rindyastuti R, Yulistyarini T, Darmayanti AS. 2019. Population and ecological study of agarwood producing tree (Gyrinops versteegii) in Manggarai District, Flores Island, Indonesia. Biodiversitas 20: 1180-1191. Gyrinops versteegii (Gilg) Domke is one of very important tree species listed in Appendix II CITES because of its economical value as a source of agarwood. Since this commodity has been harvested in a significant volume, the natural population of G. versteegii is continuously decreasing in size. A remnant forest of Pongkor is one of fragmented habitat of G. versteegii in the rest of other land use for rice farming in Flores Island. The purpose of this study were to investigate the population structure and importance value rank of G. versteegii among plant species in Pongkor Community Forest. A semi-purposive random sampling were used in this study to investigate the population of G. versteegii in Pongkor, Manggarai District. The result showed that G. versteegii in Pongkor Community Forest was abundant, especially in seedlings stage. G. versteegii were found in four stratas i.e., trees, poles, saplings and seedlings with densities of 6, 4, 15 and 23 plants ha-1, respectively. Seedlings of G. versteegii were abundant while larger plants were rare. Moreover, G. versteegii has scattered distribution and the highest important values (IVI) for trees, poles and saplings stratas, with IVI of 17.42, 25.75 and 44.42, respectively, while among the ground covers, G. versteegii ranked 22nd with an important value of 2.32. The abundant seedlings and the availability of adult trees as reproductive stages in the population of G. versteegii designated that population of G. versteegii in Pongkor could serve as a potential source of seed and young trees for plant enrichments in natural habitats and sustainable plantation in Manggarai District, Flores Island.
Yulistyarini T, Sofiah S (2011) Valuing quality of vegetation in recharge area of Seruk Spring, Pesanggrahan Valley, Batu City,. A Seruk spring is one of the springs in Batu city which has water debit less than 1 liter per second. Land use changes of Seruk spring recharge area was occurred in 2001. Recharge area of Seruk Spring consists of anthropogenic forest, eucalypts plantation, bamboo forest, pines plantation, horticulture and housing. The aim of this research was to valuing the quality of vegetation which supported ground water recharge in Seruk spring. Quality of vegetation was determined by vegetation structure, diversity, the thickness of litter and C-stock of each land use systems. Forests, eucalypts plantation and bamboo forests had almost same quality of vegetation.
Rindyastuti R, Rachmawati D, Sancayaningsih RP, Yulistyarini T. 2018. Ecophysiological and growth characters of ten woody plant species in determining their carbon sequestration. Biodiversitas 19: 610-619. Tree planting and ecosystem restoration is one of mitigation program of global climate change scheme to reduce CO2 in the atmosphere by sequestering carbon. Carbon storage in the living plant varies among species due to ecophysiological and growth characters of their photosynthesis. Ecophysiological properties of tropical plant species related to carbon sequestration was lack of investigation. The study in this area will be the significant knowledge contribution to C-sink project especially species-level management which has been agreed globally and nationally. The objectives of this research were to study the ecophysiological and growth factors affecting carbon sequestration and to select plant species with high carbon sequestration using 16 months-old-seedling of ten woody plant species. Biomass, carbon storage, the whole plant photosynthetic capacity, total chlorophyll content, stomatal index, and Leaf Area Index (LAI) were significantly different among species. The LAI, total chlorophyll content, whole plant photosynthetic capacity, stem height and stem diameter were positively correlated to biomass and carbon storage. Multivariate correlation test (P>0.05) revealed that the total of chlorophyll content was the ecophysiological factor most contributes to carbon sequestration. The total of chlorophyll content correlates to the stem height, while the whole plant photosynthesis correlates to leaf area in determining plant carbon sequestration. Moreover, two mangrove species, H. littoralis and B. asiatica have the highest carbon sequestration among species studied. For priority in tree planting program in dry lowland habitats, the local species, i.e., S. cumini and D. discolor were more recommended than any others species observed in this study.
Yulia ND, Budiharta S, Yulistyarini T (2011) Analysis of epiphytic orchid diversity and its host tree at three gradient of altitudes inMount Lawu,. The aim of this study was to observe epiphytic orchid diversity and their host trees at three different altitudes (1796, 1922 and 2041 m asl.) at southern part of Mount Lawu, District of Magetan, East Java. Line transect of 10 x 100 m was set up and then divided into ten plots (as replicates) of 10 x 10 m. At each plot, species name and number of individual of epiphytic orchids, and species name, number of individual and diameter at breast height (dbh) of host trees were recorded. The result showed that there were 19 species of epiphytic orchid recorded at the study sites. There were significantly different among gradient altitude in number of epiphytic orchid species (F = 3.7; df = (2, 27); P < 0.
The aims of this study were to know flowering and fruiting pattern of the four Cinnamomum and their response in relation to seasonal change in rainfall, temperature and air humidity in Purwodadi Botanic Garden. The vegetative and reproductive activities were observed once per week based on the abundance of leaves, flowers and fruits using a scoring method from 0-4, for 6-8 years of observations. The rainfall per month, temperature, and humidity were simultaneously recorded. Data were analysed by Principal Component Analyses to determine the microclimate variables that have correlation to the reproductive activity patterns of all four species. Most species started flower budding during Juni – August, except C. burmanii which produced flowers 2-3 times per year in small quantity. Flowering of C. burmanii showed positively correlations with rainfall intensity, while flowering the other three species did not relate to microclimate in PBG. Six dry months preceding a long dry season in 2015 caused C. burmanii did not produce flowers and fruits.
Jenis polong-polongan (suku Fabaceae) banyak digunakan dalam kegiatan rehabilitasi lahan terdegradasi sebagai tanaman pionir dan penyubur tanah. Kinerja hidrologi pohon jenis polong-polongan dalam kaitannya dengan konservasi tanah dan air belum banyak diketahui. Tujuan penelitian ini adalah untuk mengevaluasi besarnya lolosan tajuk, aliran batang dan intersepsi empat jenis polong-polongan terseleksi di Kebun Raya Purwodadi. Empat jenis pohon polong-polongan lokal yaitu Pterocarpus indicus, Cassia javanica, Senna siamea, dan Saraca indica diamati kinerja hidrologinya selama 20–30 hari hujan. Hasil penelitian menunjukkan bahwa keempat jenis polong-polongan yang memiliki model arsitektur tajuk yang sama yaitu troll dengan variasi karakteristik morfologi pohon dan daun menghasilkan variasi nilai pada intersepsi tajuk, lolosan tajuk dan aliran batang. Intersepsi dan lolosan tajuk keempat jenis pohon mempunyai nilai seimbang berkisar 30–70%, dengan aliran batang yang dihasilkan kecil berkisar 1–2%. Berdasarkan kinerja hidrologinya tersebut, penanaman keempat jenis polong-polongan untuk konservasi tanah dan air memerlukan upaya pengendalian lolosan tajuknya.
Rachmawati S, Yulistyarini T, Hairiah K. 2019. Decomposition of tree litter: Interaction between inherent quality and environment. Biodiversitas 20: 1946-1952. Litter layers protect forest soils, but may not be appreciated in recreation sites such as the Purwodadi Botanical Gardens (PBG), East Java, Indonesia. We quantified litter decomposition rates in mature stands of three tree species: mahogany (Swietenia macrophylla), angsana/narra (Pterocarpus indicus), and bungur/crape myrtle (Lagerstroemia thorelii). To separate inherent litter quality and stand-level environmental factors (such as microclimate, soil), decomposition rates were quantified for each species across all three stands. A possible interaction on decomposition rates is known as 'home-field advantage' (HFA). Litterweight loss from TSBF-standard litter bags was observed at 0, 1, 2, 4, 8 and 12 weeks after litter bags were installed to estimate the halflife time (t50). We also solicited visitor views on the presence of a thick litter layer on garden floor. Decomposition of angsana (t50=48 weeks) was 15% faster at its 'own home' than in 'neighbors home'. No significant HFA effects were found in bungur/crape myrtle litter that decomposed slower in its home environment, while mahogany decomposition was independent of location. Generally, PBG visitors knew the benefits of litter and were not bothered by its presence; litter increased the attractiveness for visitors to enjoy their happy days under the shade of trees in a 'tropical autumn'.
Abstract. Yulistyarini T, Fiqa AP, Budiharta S, Rindyastuti R. 2020. Distribution of Gyrinops versteegii in varying vegetation structures, soil properties, and microclimates in western part of Flores Island, Indonesia. Biodiversitas 21: 1800-1808. Gyrinops versteegii is one of the agarwood-producing tropical plants that is distributed in the Lesser Sunda Islands to Sulawesi, Moluccas (Maluku), and Papua. The natural population of Gyrinops versteegii (Gilg.) Domke is widely exploited, making it being listed in CITES Appendix II. Despite largely exploited, information regarding the distribution of G. versteegii to reveal the habitat characteristics of its natural population is limited. The aims of the research were (i) to investigate the habitat characteristics of the distribution of G. versteegii in term of vegetation community, as well as soil and microclimate variables in its natural habitat in western part of Flores Island, and (ii) to study the relationship between its occurrence and ecological factors. The research was conducted in one community forest and three natural forests in the districts of Manggarai and West Manggarai, Flores Island, East Nusa Tenggara Province. Data on vegetation, soil properties and microclimates were collected by establishing 73 observation plots across the four studied areas. Data were analyzed to reveal vegetation composition and structure where G. versteegii occurred, the dispersion pattern, and relationship between its occurrence and ecological factors. Our study revealed that G. versteegii populations at four studied areas in Flores Island were distributed in a broad range of habitat characteristics with varying vegetation compositions and structures, canopy covers as well as soil and microclimates variables. The local/metapopulations of G. versteegii in these areas can be dispersed in clumped or uniform pattern. Nonetheless, some ecological variables might be important for the abundance of this species including soil texture, soil pH, C organic and Soil Organic Matters (SOM). The results of this study suggest a promising opportunity for the conservation efforts of G. versteegii through the possibility of planting this species in various land management including planted in monoculture system, polyculture system (e.g. home garden and agroforestry) as well as reintroduced into species-rich natural forest.
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