Tropical peatlands are fragile ecosystems with an important role in conserving biodiversity, water quality and availability, preventing floods, soil intrusion, erosion and sedimentation, and providing a livelihood for people. However, due to illegal logging, fire and conversion into other land use, the peatlands in Indonesia are under serious threat. Efforts to restore Indonesia’s tropical peatlands have been accelerated by the establishment of the Peatland Restoration Agency in early 2016. The restoration action policy includes the rewetting, revegetation and revitalisation of local livelihood (known as the 3Rs). This paper summarises the regulatory, institutional and planning aspects of peatland restoration, in addition to the implementation of the 3Rs in Indonesia, including failures, success stories, and the criteria and indicators for the success of peatland restoration.

No abstract

No abstract

Jenis nyawai baru dikembangkan untuk pengembangan hutan tanaman. Pendugaan potensi ini memerlukan instrumen penduga volume yang tepat. Namun, instrumen tersebut belum tersedia. Volume pohon ditentukan dengan (SRB) sehingga pohon-pohon contoh tidak ditebang. Penelitian ini bertujuan mendapatkan model penduga volume terbaik dan menduga potensi tegakan nyawai di PT. ITCI-Kartika Utama Kalimantan Timur. Penyusunan model penduga volume menggunakan model linear dan non linear dengan peubah tunggal diameter, dua pubah (diameter dan tinggi), dan kombinasi diameter dengan tinggi. Model terbaik ditentukan menggunakan parameter statistik antara lain: standar error, signifikasi parameter dugaan, koefisien determinasi terkoreksi (R adj), , (AIC), simpangan relatif dan agregatif, dan bias. Model terbaik penduga volume menggunakan diamater dan tinggi sebagai peubah bebasnya dengan persamaan:Penambahan tinggi dalam penyusunan model penduga volume meningkatkan akurasi dan ketepatan dugaan dibandingkan model dengan peubah tunggal. Namun demikian, berdasarkan pertimbangan kepraktisan di lapangan, persamaan dengan variabel diameter yaitu: dapat digunakan. Model tersebut hanya digunakan dan hanya berlaku pada kondisi iklim dan tempat tumbuh yang sama. Potensi volume pohon berkisar antara 21,66 m /ha 113,56 m /ha untuk umur 4 7 tahun. Model penduga volume yang telah disusun dapat diterapkan pada tegakan dengan karakteristik tempat tumbuh hampir sama.

ABSTRAKPengembangan jenis Jelutung Rawa membutuhkan informasi yang lengkap terkait perkiraan hasil yang akan diperoleh. Perkiraan hasil dapat diperoleh dengan menduga volume tegakan menggunakan persamaan penduga volume pohon. Penelitian ini bertujuan mendapatkan model-model penduga volume terbaik jenis Jelutung Rawa untuk volume pohon total dan volume kayu yang dapat diperdagangkan. Penyusunan model penduga volume ini menggunakan 96 sampel pohon terpilih yang mewakili kondisi tegakan secara keseluruhan. Pohon sampel tersebut diukur dengan menggunakan (SRB) sehingga sampel pohon tidak ditebang. Modelmodel penduga pohon yang diujicobakan terdiri dari model linear dan non-linear dengan peubah tunggal (diameter) dan ganda (diameter dan tinggi pohon). Hasil penelitian ini menunjukkan penggunaan diameter sebagai peubah tunggal dapat digunakan menyusun model penduga volume pohon baik volume total maupun volume kayu yang dapat diperdagangkan. Namun demikian, penambahan variabel tinggi kedalam model tetap diperlukan. Model penduga volume pohon dengan dua variabel diameter dan tinggi digunakan untuk menyusun tabel volume standar. Koefisien determinasi naik < 2% dari model dengan peubah diameter. Model terbaik penduga volume baik satu atau dua peubah mempunyai R yang tinggi (> 80%). Model terbaik untuk menduga volume pohon total yakni 1) menggunakan peubah tunggal (diameter): Ln Volume = -7,9444 + (2,1952) * (Ln (Diameter)); dan 2) menggunakan peubah ganda (diameter dan tinggi): volume = 2,4081 * 10 * (Diameter .Tinggi). Model terbaik untuk menduga volume pohon yakni 1) menggunakan peubah diameter: ; 2) menggunakan peubah diameter dan tinggi:

& Key message Permanent sampling plots (PSPs) are a powerful and reliable methodology to help our understanding of the diversity and dynamics of tropical forests. Based on the current inventory of PSPs in Indonesia, there is high potential to establish a long-term collaborative forest monitoring network. Whilst there are challenges to initiating such a network, there are also innumerable benefits to help us understand and better conserve these exceptionally diverse ecosystems.

Planting was done as a rehabilitation effort at degraded tropical peatland. Understanding the characteristics of the species and environmental conditions that affect plant growth will determine the success of the planting. This study aims to determine the main environmental factors that affect plants in the field so that the right species can be determined. This study used a randomized completely blocked design which was conducted in two stages, namely field testing and verification under controlled conditions in the nursery. The research treatments consisted of inundation conditions and competition with understorey. The competition factor is interpreted by the difference in light intensity at the verification stage. The species used are meranti (Shorea pallidfolia), gerunggang (Cratoxylum glaucum), terentang (Campnosperma coreacea) dan tumih (Combretocarpus rotundatus). The results showed that the inundation conditions had an effect on the survival of meranti and gerunggang species where the survival rate was 8.3%—96.3%, but it did not affect the terentang and tumih with the survival rate reaching > 80%. The growth of meranti and gerunggang tends to decrease in line with the inundation conditions, while the growth of terentang and tumih tends to increase. Meranti growth requires understorey as protection from high light intensity. The tumih and terentang show better growth without competition with understorey. The trends in the field are consistent with observations during the verification stage. The difference in the response of plants to environmental conditions determines the presence of these species in the succession stage. Keywords: rehabilitation, flooding, drainage, succession, sequen

Grazing area functions as food supplier for animal, especially big herbivore mammal, and center of animal activity, for instant: grooming, child caring, and other social interaction. Beside that, grazing area functions as habitat of various plant species included plant with function as natural pesticide. The objective to this research is to identify the species richness of plants functioning as natural pesticide on Bekol savanna area in the Baluran National Park. Data collection was done by determining sample quadrant size and sampling unit quantity as well as species density and frequency. Data were analyzed with Important Value Index (IV) method. Result of this research indicate that there were seven species functioning as natural pesticide out of 38 species at Bekol savanna area. It means that 18% of all species functioned as natural pesticide.