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STUDI POLA SPASIAL PERSEBARAN GAHARU (Aquilaria spp.) DAN KETERKAITANNYA DENGAN KONDISI HABITAT DI TAMAN NASIONAL KUTAI KALIMANTAN TIMUR Pribadi, Didit Okta
Buletin Kebun Raya Vol 12, No 1 (2009): Buletin Kebun Raya Vol. 12 (1) Januari 2009
Publisher : Center for Plant Conservation Bogor Botanic Garden, Indonesian Institute of Sciences

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Agarwood is an important forest product due to its high economic value. However, the natural population of agarwood species has been decreasing rapidly because of over exploitation, therefore the international trade of the most important agarwood species (i.e. Aquilaria malaccensis) is restricted to just a small quota. This research was conducted in an attempt to provide basic information for the conservation of Aquilaria spp. by identifying the species spatial distribution and habitat characteristics and developing a linkage model between their abundance and habitat characteristics. Data were collected through a field survey at Kutai National Park in August 2006 with Aquilaria spp. as the target species. Data on the species localities were used to determine the species densities and the value of Distance Index of Dispersion. The ordinance levels between the target species and the surrounding other species were identified using a correspondence analysis, while the linkage model between the species abundance and habitat characteristics was established using an ordinal multinomial logit model. The results showed that Aquilaria spp. had a low density (0.01/ha) and were spatially distributed in a clump pattern. The abundance of Aquilaria species had a close association with soil texture, humidity and acidity, land elevation, air temperature and humidity, and light intensity. The abundance decreased with increasing the proportion of sandy clay loam content, soil humidity and acidity, land elevation, and light intensity. In contrast, the abundance increased with increasing sandy loam content, air temperature and air humidity. The existence of A. malaccensis was likely to associate with the existence of Goniothalamus sp., Macaranga sp., Vordia splendidissima, Lygopodium sp., and Stachyphrynium borneensis.

ANALISIS PENGARUH PEMUPUKAN TERHADAP TINGKAT KESINTASAN DAN PERTUMBUHAN BIBIT GAHARU (Aquilaria microcarpa Baill.) Sahromi, Sahromi; Wahyuni, Sri; Pribadi, Didit Okta
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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Treating gaharu (Aquilaria microcarpa) seedlings with inorganic fertilizers is essential to obtain vigorous seeds with high adaptability for establishment on the field. The aims of this research were to find out the effect of fertilization on the survival and growth rate of Aquilaria microcarpa seedlings and to identify appropriate dosage of fertilizer that could increase the growth optimally. Complete Random Design was employed with two treatments i.e. using root fertilizer (Urea, TSP, KCL) with 5 dosage levels and using leaf fertilizer (Gandasil D and Bayfolan) with 7 dosage levels. Data was analyzed by using statistic descriptive and analysis of variance (ANOVA) method. The parameters used were seedling survival rate, height increase and number of leaves. The result showed that the two fertilizers could increase survival rate of the seedling. However, higher dosage of root fertilizer was followed by lower survival rate. The treatment using root fertilizer had a significant effect on the number of leaves, whereas treatment using leaf fertilizer had a significant effect on the increase of the seedling height. Adding leaf fertilizer is considered more useful in terms of survival and growth rate.

STUDI POLA SPASIAL PERSEBARAN GAHARU (Aquilaria spp.) DAN KETERKAITANNYA DENGAN KONDISI HABITAT DI TAMAN NASIONAL KUTAI KALIMANTAN TIMUR Pribadi, Didit Okta
Buletin Kebun Raya Vol 12, No 1 (2009): Buletin Kebun Raya Indonesia Vol. 12 (1) January 2009
Publisher : Center for Plant Conservation Bogor Botanic Garden, Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar

Agarwood is an important forest product due to its high economic value. However, the natural population of agarwood species has been decreasing rapidly because of over exploitation, therefore the international trade of the most important agarwood species (i.e. Aquilaria malaccensis) is restricted to just a small quota. This research was conducted in an attempt to provide basic information for the conservation of Aquilaria spp. by identifying the species spatial distribution and habitat characteristics and developing a linkage model between their abundance and habitat characteristics. Data were collected through a field survey at Kutai National Park in August 2006 with Aquilaria spp. as the target species. Data on the species localities were used to determine the species densities and the value of Distance Index of Dispersion. The ordinance levels between the target species and the surrounding other species were identified using a correspondence analysis, while the linkage model between the species abundance and habitat characteristics was established using an ordinal multinomial logit model. The results showed that Aquilaria spp. had a low density (0.01/ha) and were spatially distributed in a clump pattern. The abundance of Aquilaria species had a close association with soil texture, humidity and acidity, land elevation, air temperature and humidity, and light intensity. The abundance decreased with increasing the proportion of sandy clay loam content, soil humidity and acidity, land elevation, and light intensity. In contrast, the abundance increased with increasing sandy loam content, air temperature and air humidity. The existence of A. malaccensis was likely to associate with the existence of Goniothalamus sp., Macaranga sp., Vordia splendidissima, Lygopodium sp., and Stachyphrynium borneensis.

MODEL PERUBAHAN TUTUPAN LAHAN DAN FAKTOR-FAKTOR YANG MEMPENGARUHINYA Pribadi, Didit Okta
Jurnal Teknologi Lingkungan Vol. 7 No. 1 (2006): JURNAL TEKNOLOGI LINGKUNGAN
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Urban and regional development needs space and land which then replaces the existence of natural space. The loss of natural space does not give negative impacts as long as it does not exceed ecological carrying capacity.Unfortunately, urban and regional development in Indonesia is dominated by economy motivation than ecology consideration. As a result, several natural disasters occurred such as flood, ground water depletion, land slides etc. Our research objective is to analyze land cover change from natural space to human activity space and several factors which cause it at 4 different regions: Malang Municipal, Batam Municipal, Pemalang Regency and Muaro Jambi Regency. Research result could be used as basic information for local government to arrange planning, use and control spatial change in each area. This research was conducted by using two different time data images with interval 10 years to get land cover change on each region and social economy data from National Statistic Bureau. The model was formulated by using forward stepwise multiple regressions and the result showed that each region has different factors which increase land cover change of natural space such as: (1) Malang Municipal was dominantly influenced by urban sprawl phenomenon, (2) Batam Municipal wasdominantly influenced by government policy to develop industry, (3) Pemalang Regency was dominantly influenced by appearance of several new growth poles, and (4) Muaro Jambi Regency was dominantly influenced by land necessity for agriculture activities.

Population Study of the Golden Chicken Fern (Cibotium barometz (L.) J. Sm. in Riau Province, Sumatra Praptosuwiryo, Titien Ngatinem; Puspitaningtyas, Dwi Murti; Pribadi, Didit Okta; Rugayah, Rugayah
Journal of Tropical Life Science Vol 7, No 2 (2017)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.07.02.13

Cibotium barometz (L.) J.Sm. (Cibotiaceae) is an important export commodity for both traditional and mod-ern medicine. Populations of this species in several countries have decreased rapidly due to the uncontrolled collection of the rhizome parts for medicinal purposes. Since 1976, this species has been included in Appendix II of the Convention on International Trade in Endangered Species (CITES). This means that no export is allowed without a prior permit issued by the CITES committee. Â In order to utilize an endangered species sustainably, the global NDF (Non-Detriments Finding) system is applied for determining annual quotas. Therefore, monitoring and updating the inventory of C. barometz in its natural habitat should be carried out annually. A population study of C. barometz carried out in 2011 in Riau Province, Sumatra, is reported here. The aims of the study were: 1) to inventory C. barometz and determine its variation in Riau Province, Suma-tra, 2) to study the distribution and ecology of C. barometz, and 3) to assess the population size of this spe-cies by using random search methodology incorporating belt line transects. Two variants of C. barometz are recognized; they are the golden yellow and golden brown variants. C. barometz is distributed in eight loca-tions of Kampar District of Riau Province, in the secondary forest and rubber agroforest between 80 m and 600 m above sea level (asl). This species grows well in open to partially opened areas of secondary forest and rubber plantation in hills with a range of slope between 30Â° and 90Â°, with a relatively high humidity, 60 â€“ 90%, in acid to nearly neutral soil, with a range of soil fertility from very poor to very humus rich soil. Â The average population density determined in our study was 20 plants per 100 square meter. The highest popula-tion size was in the secondary forest of Bukit Kuda Beban at 590 â€“ 600 m asl., viz. 9405 plants with a popula-tion density Â of 47 plants per 100 square meter.

Analisis Nilai Kehijauan Berdasarkan Pengukuran Komputasi dan Persepsi Manusia pada Ruang Terbuka Hijau di Pekanbaru, Riau Septiantoro, Ripki; Zain, Alinda Fitriany Malik; Pribadi, Didit Okta
Jurnal Lanskap Indonesia Vol. 17 No. 1 (2025): Jurnal Lanskap Indonesia
Publisher : http://arl-faperta.ipb.ac.id/

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jli.v17i1.57392

Along with economic development, there have been changes in land use, resulting in forests, green space, and agricultural land conversion into residential and industrial/commercial areas in many cities. Due to the reduction in green space, efforts have been made in urban planning to restore greenery around residential neighborhoods in many metropolitan areas. The government has made several efforts to regulate urban development planning to ensure sustainability. One of the efforts is the implementation of Law No. 26 of 2007, which mandates that at least 30% of the city's area must be designated as Green Open Space (GOS). The Green City Development Program (P2KH) implemented the law in several cities, including Pekanbaru, the capital of Riau Province, Indonesia. This study aims to measure the impact of the Green City program implementation on the increase or decrease in the area of GOS in Pekanbaru City and and to analyze the quality of Greenery Values of GOS in Pekanbaru City based on human perception and computational measurement. This research analyzes Land Use Cover Change (LUCC) post-P2KH in Pekanbaru and compares mapping methods with human perceptions of greenery at randomly selected locations. Using QGIS 3.36.0 and the Maximum Likelihood Classification (MLC) method, the study found that the decline in Green Open Spaces in Pekanbaru has leveled off from 11.85% before P2KH to 6.59% after P2KH, and the increase in built-up areas has slowed from 12.58% to 6.2%. Computational measurements, such as NDVI, and human perceptions reveal that Pekanbaru's GOS need improvements in safety, comfort, aesthetic quality, and biodiversity. This research indicates that the P2KH has mitigated the high rate of land cover and land use changes in Pekanbaru.

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