Articles

Found 11 Documents
Search

A Study of Flood Causal Priority in Arui Watershed, Manokwari Regency, Indonesia Mahmud, Mahmud; Kusumandari, Ambar; Sudarmadji, Sudarmadji; Supriyatno, Nunuk
Jurnal Manajemen Hutan Tropika Vol. 24 No. 2 (2018)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (13.102 KB)

Abstract

Papua is the final fortress of forests in Indonesia. However, floods recently occurred in Jayapura, Paniai, and Manokwari. If causal factors are not identified and early anticipated, the flood will become an annual disaster with more severe impacts. This study aims to identify main factors causing floods using scoring analysis. Data collected include: rainfall, river gradient, water discharge, drainage density, watershed shape, slope and land use. The research results show that the main factor of floods are average daily rainfall in wet month by 86.53 mm day-1 (rather high) with a score of 28, land use dominated by forest and plantation (rather low and medium) with a score of 21, watershed slope dominated by 1-<8% (high) with a score of 5, drainage density of 6.4 (medium) with a score of 3, watershed shape (Rc of 0.30 < Re 0.71) with  somewhat/elongated shape with a score of 2, and river gradient of 0.0062 (low) with a score of 2 respectively. High rainfall causes greater flow of water and runoff. Land use dominated by plantations (21.46%) is thought to be one of the main causes of floods in Masni District. Flood mitigation does not mean that rain should be reduced, but regulates/manages such as stopping the conversion of forest into palm oil plantations, reducing surface runoff by applying soil conservation, making bypass from meandering, dredging sediments, and constructing retaining walls.
Preliminary Stand Table for Average Dominant Trees of Jati Plus Perhutani in Saradan, Madiun, and Ngawi Forest Districs Rahmadwiati, Rissa; Sadono, Ronggo; Supriyatno, Nunuk
Jurnal Manajemen Hutan Tropika Vol. 22 No. 1 (2016)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (223.973 KB) | DOI: 10.7226/jtfm.22.1.57

Abstract

In order to realize sustainable teak forest management, the strategic plan of forest management is highly needed to establish the growth characteristics model of Jati Plus Perhutani (JPP). The most thing which cannot be ignored to estimate the growth and yield of teak is quantification of site quality differentiation. The objective of this study is to arrange and predict the properly yielded table of the average dominant trees of JPP in the forest management unit of Saradan, Madiun, and Ngawi. The trees sampling had been selected for the age of 6 to 12 years from the best compartment areas in JPP. Growth model and JPP's yield stands were predicted using growth parameters such as diameter (dbh), total height, clear bole height, volume, and growing space. Each parameter was analyzed using SPSS 20 statistical software to determine the best growth model that will then be used to predict the stand table parameters values. The equation was selected from the highest R2 value or the value which is approaching to 1, with low standard error estimation (SEE).  The result shows that best equation model to estimate the growth from tree parameters on medium site of JPP are dominated by S model and the best model for bole height is growth model. The data were taken from an initial observation as a preliminary study, further research is expected to enhance the results of current research to obtain the stand table which can be applied in the future.  
Evaluation of Annual Allowable Cut (AAC) Determination of Teak Forest Plantations in Perum Perhutani, Indonesia Rohman, Rohman; Warsito, Sofyan P; Supriyatno, Nunuk; Purwanto, Ris Hadi; Atmaji, Catur
Jurnal Manajemen Hutan Tropika Vol. 20 No. 3 (2014)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (563.229 KB) | DOI: 10.7226/jtfm.20.3.195

Abstract

The degradation of teak forest plantations in Java that are managed by Perum Perhutani (PP) continues to happen, and this is caused by some risk factors such as illegal logging, grazing, forest fire, and encroachment. However, these risk factors have not been considered by PP notably in annual allowable cut (AAC) determination of yield regulation. Therefore, the AAC value could be overestimated. The research was aimed at evaluating the method of AAC determination and proposing an alternative method that considers the risk factors. This research was conducted with a series of data analysis approach from the data on five planning periods. The research result showed that forest damage occurs in varied situations. On average, the rate of deforestation accounted for 0.8% per annum. The calculation of AAC by considering the rate of damage risk in normal condition approximately made up 70.8%. Thus, compared to another method without considering damage risk rate, overestimation constituted 29.2%. In brief, this had an impact on the decline of timber stock. 
KEANEKARAGAMAN STRUKTUR TEGAKAN HUTAN ALAM BEKAS TEBANGAN BERDASARKAN BIOGEOGRAFI DI PAPUA Kuswandi, Relawan; Sadono, Ronggo; Supriyatno, Nunuk; Marsono, Djoko
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 22, No 2 (2015)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1.84 KB)

Abstract

Kegiatan penebangan berdampak pada perubahan komposisi dan struktur tegakan, penyebaran jenis pohon, kesamaan komunitas dan keragaman jenis. Penelitian ini bertujuan untuk mengetahui keragaman struktur dan komposisi tegakan pada hutan bekas tebangan berdasarkan bioregion di Papua. Hasil penelitian menunjukkan bahwa komposisi dan struktur secara ekologi berbeda yang ditunjukkan dengan nilai indeks kesamaan jenis yang rendah. Jenis-jenis penyusun tegakan pada tingkatan semai, pancang, tiang dan pohon dari tiap-tiap lokasi hampir semua berbeda. Namun ada beberapa jenis yang sama ditemui mendominasi pada lokasi PT. TTL dan PT. MML seperti Vatica rassak dan Syzygium sp. Kerapatan tegakan di PT. TTL lebih tinggi dibanding dengan kedua lokasi, sementara PT. WMT adalah lokasi dengan kerapatan tegakan paling rendah. Keragaman tegakan di PT. WMT adalah yang paling tinggi, sedangkan keragaman tegakan di PT. TTL adalah yang paling rendah.
Normalitas Tegakan Berbasis Resiko untuk Pengaturan Kelestarian Hasil Hutan Tanaman Jati di Perum Perhutani Rohman, Rohman; Warsito, Sofyan P; Purwanto, Ris Hadi; Supriyatno, Nunuk
Jurnal Ilmu Kehutanan Vol 7, No 2 (2013)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.913 KB) | DOI: 10.22146/jik.7515

Abstract

Hutan tanaman jati yang dikelola oleh Perum Perhutani, dalam berbagai keadaan termasuk kondisi yang relatif aman, selalu memiliki resiko kerusakan yang menyebabkan menurunnya kualitas kelas hutan produktif ke arah tidak produktif. Penelitian ini bertujuan untuk mengetahui standar kenormalan hutan tanaman jati yang mempertimbangkan resiko kerusakan sebagai dasar pengaturan kelestarian hasil. Penelitian ini dilaksanakan di KPH Randublatung Perum Perhutani Divisi Regional Jawa Tengah. Resiko kerusakan (casualty per cent) didekati dari angka kerusakan tegakan berdasarkan data seri selama 4 jangka perencanaan mulai jangka 1983/1992 sampai jangka 2013/2022. Normalitas tegakan didekati dari luas tegakan yang harus dibangun, sedemikian sehingga diperoleh hasil tahunan yang realtif sama dengan mempertimbangkan casualty per cent. Hasil penelitian menunjukkan bahwa luas hutan normal ideal tanpa mempertimbangkan resiko kerusakan di KPH Randublatung dengan luas untuk produksi 27.359,4 ha dan daur 60 tahun adalah sebesar 456,0 ha per tahun. Dengan mempertimbangkan casualty per cent, luas hutan normal berbasis resiko di KPH Randublatung sebesar 229,5 ha per tahun atau 50,3% dari luas normal ideal. Untuk memperoleh hasil tahunan yang realtif sama seluas 229,5 ha, struktur luas hutan yang harus dibangun mulai KU I, KU II, KU III, KU IV, KU V, dan KU VI berturut-turut sebesar 6.875 ha; 5.784 ha; 4.711 ha; 3.997 ha; 3.232 ha dan 2.761 ha.Katakunci: casualty per cent, hutan normal, Perum Perhutani, hutan tanaman jati Risks-based Stand Normality for Sustainable Yield Forest Plantation in Perum PerhutaniAbstractIn any situation, either secure or insecure, teak forest plantations encounter high risks due to ecological and social disturbances, causing degradation and decrease their normality in terms of areas and standing stock. This research aimed to determine the normality standard of teak forest plantations under risks as a basis for better sustained yield regulation. This research was conducted in forest management unit (FMU) of Randublatung, state-owned forest company (Perhutani), located at Central Java. The risk of forest damages, called casualty per cent, was calculated using a series of age class structures based on a 10-year periodic forest inventory for four sequential planning periods:1983/1992, 1993/2002, 2003/2012,to 2013/2022. The normal forest was determined based on the stands area basis, which was defined based on the final cutting area that already incorporates casualty per cent, in such a way that each year the newly planted forests areas have relatively the same number. The results showed that without casualty per cent, the normal forest built every year in FMU Randublatung was 456 ha/year for a 60-year rotation cycle. However, by incorporating the damage risks (casualty per cent), the normal forest area in KPH Randublatung should be built only 229.5 ha/year or just 50.3% of the current planning. Furthermore, in order to obtain this annual harvesting, the normal forests should have age classes structures from age class I, II, III, IV, V, and VI, in such a way that their areas equal to 6,875 ha, 5,784 ha, 4,711 ha, 3,997 ha, 3,232 ha, and 2,761 ha, respectively.
Conservation Design and Scenario for Flood Mitigation on Arui Watershed, Indonesia Mahmud, Mahmud; Kusumandari, Ambar; Sudarmadji, Sudarmadji; Supriyatno, Nunuk
Indonesian Journal of Geography Vol 51, No 3 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (107.011 KB) | DOI: 10.22146/ijg.37296

Abstract

Flooding has been natural disaster in Indonesia and elsewhere. This research is designed to create scenarios and designs conservation to mitigate flooding disaster.  Data potential ,vulnerability, and duplicated river covering 0.25% of the targeted flooding area were collected and analysed. Five disain of conservation, natural river as control, river normalization, normalization with gabion stone, river straigtening, and straigtening with gabion stone, are proposed, and main targeted responses of these five scenarios are river current velocity. Effectiveness scenarios were analysed using Anova and Tukey test. The results showed that alignment with gabion stone was the most effective scenario for flooding mitigation since this was the most effective in increasing river current velocity. This could prevent riverbank occurrence of avalanche, accelerate river current, overcome flooding, and prevent future flooding. Other scenarios likes dead clicth ended-hallway, canalization, and riparian reclamation are also possible implemented.
MODEL PENGELOLAAN HASIL HUTAN KAYU OLEH MASYARAKAT ADAT: STUDI KASUS PEMILIK HAK ULAYAT DI KABUPATEN TELUK BINTUNI Kuswandi, Relawan; Sadono, Ronggo; Supriyatno, Nunuk; Marsono, Djoko
JURNAL KEHUTANAN PAPUASIA Vol 1 No 1 (2015): Jurnal Kehutanan Papuasia
Publisher : Fakultas Kehutanan UNIPA

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

Abstract

Pemanfaatan sumberdaya hutan oleh masyarakat adat pemilik hak ulayat dalam rangka peningkatan perekonomian merupakan implementasi Otonomi khusus Papua. Dengan besaran kompensasi berkisar Rp.200.000 - Rp.300.000/m3 oleh IUPHHK kepada masyarakat adat berdasarkan negosiasi. Pemanfaatan olahan kayu digunakan untuk memenuhi kebutuhan sebagai bahan bangunan oleh masyarakat. Penelitian ini bertujuan untuk mengetahui model pengelolaan hasil hutan kayu oleh masyarakat pemilik hak ulayat. Hasil penelitian menunjukkan bahwa Model pengelolaan hasil hutan kayu oleh masyarakat adat (marga Sayori) masih sangat sederhana. Keterlibatan masyarakat pemilik hak ulayat dalam proses pengolahan kayu sangat kecil, hanya terbatas pada pemberian hak pengelolaannya kepada pemilik modal. Pemilik hak ulayat hanya menerima konpensasi berdasarkan kubikasi hasil olahan kayu yang dilakukan oleh pemilik modal.
The Species Diversity and Structure of The Limited Production Forest in Arui Watershed of Manokwari District of West Papua, Indonesia Mahmud, Mahmud; Kusumandari, Ambar; Sudarmadji, Sudarmadji; Supriyatno, Nunuk
Biosaintifika: Journal of Biology & Biology Education Vol 11, No 2 (2019): August 2019
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/biosaintifika.v11i2.16340

Abstract

The detailed causal factors of flood have not been established, whether because of the damage of upper watershed, sedimentation resulting in shallow river, forest conversion, the decrease in abundance and structure or high rainfall. The study aimed at finding out the species diversity and structure of the limited production forest (LPF) from the seedling to the tree stage of Arui watershed in Manokwari district. The species diversity was determined based on Shannon-Wiener index, while vegetation structure was determined based on Importance Value Index. There were totally 92 plots of samples drawn using systematic sampling. The results of vegetation analysis showed that there were 174 species of 43 families with the species diversity of 1.5-1.8 that was categorized as moderate. The four dominant species that were always found in seedling, sapling, pole and tree stages included: Pometia pinnata, Teijsmanniodendron bogoriense, Chisocheton ceramicus, and Horsfieldia irya. The conversion of the LPF into non-forestry sector for the purpose of accelerating development must be reviewed by considering hydrology, land, biodiversity, and social and regional aspects in order to prevent and to reduce flood in the coming days.
Evaluasi Produktivitas Kayu dalam Pengelolaan Hutan Rakyat Lestari Skema Forest Stewardship Council di Jawa Timur Hermudananto; Supriyatno, Nunuk
Jurnal Silva Tropika Vol 3 No 2 (2019): Jurnal Silva Tropika
Publisher : Fakultas Kehutanan Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (175.48 KB)

Abstract

Hutan rakyat lestari tersertifikasi di Indonesia terus bertambah jumlahnya untuk skema Forest Stewardship Council (FSC). Setidaknya tiga aspek telah terpenuhi yaitu, produksi yang berkelanjutan, ekosistem yang terjaga, dan berkontribusi sosial. Namun, permasalahan ?tebang butuh? di hutan rakyat berpotensi menghambat pengelolaan hutan dalam hal pemanenan kayu. Tiga unit manajemen hutan rakyat bersertifikasi FSC di Jawa Timur, Enggal Mulyo, KSU KAM KTI, KSU Bromo Mandiri KTI, memperlihatkan tantangan ini melalui evaluasi catatan pemanenan kayu, diskusi dengan pengelola dan petani, serta observasi lapangan. Rencana pemanenan hanya berdasar pada data inventarisasi pohon secara periodik yang belum mempertimbangkan kebutuhan panen petani, seperti pernikahan atau perayaan. Oleh karena itu, semua target produksi kayu tahunan tidak dapat tercapai yang mengindikasikan tebang butuh dan tebang tunda juga masih terlihat dalam pengelolaan hutan lestari tersertifikasi secara internasional. Dukungan dari pengelola dan para pihak tetap diperlukan agar rencana pengelolaan dapat diimplementasikan dengan baik. Pemilik skema FSC juga perlu mengevaluasi persyaratan standar mereka untuk pelaksanaan pemanenan kayu pada skala hutan rakyat yang lebih realistis.
FASILITASI KELOMPOK TANI HKM DALAM PERSIAPAN KEGIATAN PEMANENAN DAN PASKA PANEN AGROFORESTRI PORANG DI GUNUNG KIDUL, INDONESIA -, Hermudananto; Madya Septiana, Ratih; Supriyatno, Nunuk
Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 3, No 1 (2020): Kumawula: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kumawula.v3i1.24727

Abstract

Desa Banyusoco di Kabupaten Gunung Kidul memiliki hutan rakyat yang dikelola oleh empat kelompok tani Hutan Kemasyarakatan (HKm), salah satunya yaitu Sedyo Rukun dengan luas 17 ha yang didominasi tanaman Jati. Lahan di bawah tegakan ini umumnya belum dimanfaatkan secara optimal untuk menambah pendapatan mereka. Dalam rangka mendukung Desa Banyusoco sebagai desa wisata, serta meningkatkan kesejahteraan petani, sejak tahun 2018 masyarakat mengadopsi budidaya agroforestri Porang (Amorphophallus muelleri) di bawah tegakan dengan fasilitasi kelembagaan kelompok tani yang dimulai pada tahun yang sama. Tahun 2019, tanaman Porang direncanakan dipanen berupa umbi dan bulbil (katak), sehingga kesiapan masyarakat diperlukan untuk pemanenan dan paska panen untuk mengoptimalkan produktivitas dan pendapatan dari budidaya agroforestri Porang. Hal ini memotivasi tim Pengabdian Kepada Masyarakat (PKM) Fakultas Kehutanan UGM untuk memfasilitasi kelompok tani HKm Sedyo Rukun melalui kegiatan observasi lapangan, Focus Group Discussion, pelatihan, serta studi banding dengan tujuan Kelompok Tani HKm i) Mampu melakukan pemanenan Porang dengan produktivitas optimal; ii) Memiliki aturan tentang distribusi manfaat dari budidaya agroforestri Porang kepada anggotanya; iii) Mampu meningkatkan nilai tambah Porang dengan produk paska panen. Hasil yang dicapai yaitu pelatihan dan studi banding yang dilaksanakan memberi motivasi petani budidaya dan pengolahan Porang lebih optimal dengan pendampingan secara intensif melalui kegiatan PKM.