Abstract. Dimara PA, Purwanto RH, Sunarta S, Wardhana W. 2021. The spatial distribution of sago palm landscape Sentani watershed in Jayapura District, Papua Province, Indonesia. Biodiversitas 22: 3811-3820. Sago palm is one of the starch sources used as local food in Papua, therefore this research aims to identify the supporting environment for the plant to grow by utilizing spatial data. The methods used were Spatial Analysis and Field Survey, where the first employed satellite imagery of Quickbird in 2012 and Landsat 8 in 2020 to distinguish between sago and non-sago palm landscape. In the process, five parameters were used, consisting of covering land elevation, slope gradient, soil type, rainfall as well as the optimal distance from the river and lake. The result showed the sago palm landscape in Sentani Watershed lies in the elevation of 0-450 m asl, while its largest habitat which lies between 0-100 m asl covering an area of 4,385.63 is found in a flat slope covering an area of 2,941.99 ha and in a very steep slope that spreads out over 41.92 ha. Generally, in Sentani Watershed, the plant grows in Mediterranean soil possessing thick solum with pH 5.0-7.0 and medium to great soil erodibility. Moreover, the largest habitat experiences a precipitation rate of 1,750 mm yr-1 covering a total of 6,846.24 ha, while the Doyo River has the largest sago palm landscape compared to other rivers.

Sago palm (Metroxylon sagu) plays a vital role in the Papuan indigenous community’s social, economic, and cultural life. It is a source of staple food, household income, and embedded cultural values. This research aimed to determine the extent of sago palm habitat spread using spatial data. The classification method and multispectral imaging were used by employing satellite imagery (Landsat 8 and Quick Bird) and field surveys. The sago forest coverage in Yapen islands was 87.73%, located between 9–50 masl, covering 9,456.26 ha. The results revealed that 43.53% of the habitat lies in the inclination of 2–8% (extreme gentle slope), covering 4,692.45 ha. Sago forest was found in a gleysol soil type with precipitation of 3,000-3,100 mm. The sago forest distances of 0–250 m and 251–500 m to the coastline showed that the habitat covers an area of 153.87 ha and 368.19 ha. The preferable area in this category is Raimbawi Subdistrict, followed by Kosiwo, and the less suitable area, or the marginal land, is in Windesi Subdistrict. Keywords: Alternative crop, Metroxylon sagu, sago, spatial distribution, Yapen Islands

Penelitian ini bertujuan untuk memahami klasifikasi kualitas dan nilai komersial dari jenis gaharu pada klaster pedagang pengumpul di kabupaten Sorong yang berlangsung selama dua bulang di tahun 2016 dengan menggunakan metode deskriptif melalui kegiatan kajian lapangan dan proses wawancara kepada narasumber terkait aktivitas dan proses pemasaran gaharu. Hasil penelitian menunjukkan bahwa terdapat tiga kelompok gaharu antara lain: gubal, kemedangan dan abuk yang selanjutnya dikelompokan menjadi: super, AB, teri, sabah, TGC, kemedangan and abuk. Selanjutnya analisis nilai komersial berdasarkan sub kelas, dibagi menjadi: double super/ king, super, kacang AB pas, kacang Ab, kacang ABAB, teri tenggelam, teri A, teri B, teri C, sabah tenggelam/tua, sabah biasa, sabah tanggung, TGC, medang A, medang B, abuk super, abuk medang dan abu kerokan dengan kisaran nilai komersialnnya berkisar antara 5.000 hingga 200 juta per kilogramnya. Selain itu terdapat lima klaster pedagang pengumpul di Kabupaten Sorong. Total pencari gaharu plasma tercatat sebanyak 1.060 orang yang terdistribusi pada beberapa kabupaten/kota antara lain: Kota Sorong, Kabupaten Sorong Selatan dan Kabupaten Maybrat, Provinsi Papua Barat.

Tujuan dari penelitian ini adalah untuk mengetahui respon pertumbuhan semai gaharu (Aquilaria malaccensis) terhadap pemberian pupuk organik melalui penggunaan metode eksperimen rancangan percobaan lengkap (RAL) dengan total 180 unit percobaan. Hasil penelitian respon pertumbuhan semai gaharu menunjukkan tidak ada perbedaan yang nyata antara ketiga perlakuan yang diberikan terhadap pertambahan tinggi semai gaharu dengan nilai F hitung 2,196 lebih besar dari pada signifikannya yaitu 0,192. Rata-rata pertumbuhan diameter tertinggi dimiliki oleh perlakuan kontrol yaitu 0,037 cm sedangkan perlakuan media campuran pupuk kandang dan top soil dan media campuran pupuk kandang, EM4+ dan top soil memiliki nilai rata-rata pertumbuhan yaitu 0,09 dan 0,08 cm.  Hasil penelitian menunjukkan bahwa tidak ada perbedaan yang nyata antara tinggi, diameter dan percabangan tanaman pada ketiga perlakuan yang diberikan.

Jayapura Regency is an area in Papua Province with relatively rapid growth since it was formed into a district in 2016. Over the last ten years, massive land use and changes have occurred in Jayapura Regency. Changes in land use can be identified by looking at the land use that occurred in the past and present. Land use change is an unavoidable process, so it is important to study it empirically and in multi-time observations for development planning. In this regard, the formulation of the problem is that the types of land use and change in Jayapura Regency are not yet known with a case study of the spatial approach in 2005 and 2018. Based on the formulation of the problem, the purpose of this study is to determine the typology of land use and change in Jayapura Regency for 2005 and 2018. It is hoped that this study will become a data base and spatial information on land use in Jayapura Regency and enrich knowledge about spatial models of land use change that can be used as an approach to regional development planning. The results of the study show that based on land use classification in Jayapura Regency, there are 20 typologies of land use where primary dry land forest type has an area of ​​983,713.71 ha or 67.98% of the total area. Most of these forests are state forest areas with protection and production functions. During the period 2005 – 2018, Jayapura Regency lost 6,508.08 ha of forested area with an average rate of forest depreciation reaching more than 500.62 ha annually, while open land changed functions almost half of its original use.