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All Journal MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management Jurnal Penelitian Kehutanan Wallacea Jurnal Manusia dan Lingkungan
Elias
Department Of Forest Management, Faculty Of Forestry And Environment, IPB University, Academic Ring Road, Campus IPB Dramaga, Bogor, Indonesia 16680
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Environmental Science Social Sciences

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Does Gap Opening and Planting to Rehabilitate the Degraded Tropical Natural Forests Affect the Forest Composition and Structure? Elias; Bintang C. H. Simangunsong
Jurnal Manajemen Hutan Tropika Vol. 28 No. 3 (2022)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7226/jtfm.28.3.292

Abstract

By 2020, there were 33.4 million ha of degraded forests in Indonesia. If it is not rehabilitated, there will be land-use changes that significantly affect its biodiversity and environment. Gap opening and planting is an important silvicultural regeneration method to rehabilitate degraded tropical natural forests. We studied the subject in a 10 ha degraded lowland tropical natural forest in Central Borneo, Indonesia. The study aims to compare the composition and structure of degraded tropical natural forests before and after gap opening and planting. The methods used consist of 1) gap opening and planting with a proportion of the total gap area to the total degraded natural forest area of 40%; 2) vegetation analysis to assess the composition and structure of forest. The results showed that the gap opening and planting activities led to a decrease in the density of seedlings, saplings, poles, and trees, and cause loss of two species at seedling level and one species at sapling level. The analysis results of the stand structure and species composition, index of species diversity, species evenness index, and community similarity index before and after gap opening and planting of the degraded forest in the study area of 10 ha showed that there is no changes of these variables. These results showed that the use of the gap opening and planting method in the rehabilitation of degraded forests is able to maintain the stability of species composition and stand structure, species diversity, species evenness, and forest communities. In conclusion, the study provided significant empirical results on the composition and structure of degraded tropical natural forests before and after gap opening and planting, which would be instrumental for the development of rehabilitation strategies. It is recommended that the rehabilitation of degraded tropical natural forests in Indonesia can be carried out using the gap opening and planting method.
Impacts of gap planting on soil density and erosion Elias Elias; Ujang Suwarna
Jurnal Penelitian Kehutanan Wallacea Vol. 8 No. 1 (2019)
Publisher : Foresty Faculty of Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1149.01 KB) | DOI: 10.18330/jwallacea.2019.vol8iss1pp9-18

Abstract

By 2016, there were 32.70 million ha of degraded forests in Indonesia. If it isnot quickly rehabilitated, there will be land use changes and expansion of industrial forest plantation, which significantlyaffects itsbiodiversity and environmental. This research aims to study the impacts of the gap planting technique with red jabon on soil density and erosion. The research used: (1) the gap planting technique of red jabonwitha proportion of the total gap area to thetotal natural forest area of 40%: 60%, planting distance of 4m x 5m, and the number of trees planted of 200 stems/ha, (2) Digital-Humboldt Static Cone Penetrometer to measure soil density, and (3) stick for soil erosionmeasurement. The results showed that gap planting with red jabon to rehabilitate degraded natural forests increasedthe soil density, but itsvalue was categorized as a very loose soil class. On the other hand, the soil erosionin gap area was lower than in degraded natural forest area, because the condition of a part of the degraded forest was unvegetatedland, and there were the wastes of branches, twigs, and leaves as well as grown grasses on the soil surface that hinder the soil erosion in the gap area. This research concluded, that the impact of the gap planting on soil density can be neglected, and the impact of the gap planting on soil erosion is positive. Further research on social-economic, biodiversity, effective and efficiency aspects of the gap planting technique for forest rehabilitation are needed before its implementation
KERUSAKAN TEGAKAN TINGGAL AKIBAT PEMANENAN KAYU REDUCED IMPACT LOGGING DAN KONVENSIONAL DI HUTAN ALAM TROPIKA (STUDI KASUS DI AREAL IUPHHK PT. INHUTANI II, KALIMANTAN TIMUR) (Residual Stand Damage Caused by Conventional and Reduced Impact Logging)) Muhdi Muhdi; Elias Elias; Daniel Murdiyarso; Juang R Matangaran
Jurnal Manusia dan Lingkungan Vol 19, No 3 (2012): November
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jml.18468

Abstract

ABSTRAKPenelitian ini bertujuan untuk mengetahui kerusakan tegakan tinggal akibat pemanenan kayu dengan teknik reduced impact logging (RIL) di hutan alam tropika. Penelitian dilakukan di areal PT Inhutani II, Kalimantan Timur. Petak penelitian ini masing-masing 3 (tiga) plot permanen dengan ukuran masing-masing 100 m x 100 m. Plot-plot permanen/pengukuran diletakkan secara sistematis pada kedua petak  penelitian  sedemikian rupa sehingga mewakili tempat-tempat sebagai berikut : lokasi tempat pengumpulan kayu (TPN),  di lokasi jalan sarad utama dan di lokasi jalan sarad cabang. Hasil inventarisasi tegakan menunjukkan bahwa potensi tegakan rata-rata pada petak pemanenan kayu konvensional dan RIL masing-masing sebesar 353,51 N/ha dan 362,67 N/ha. Jumlah kerusakan tegakan tinggal rata-rata akibat pemanenan kayu pada petak pemanenan kayu konvensional dan RIL masing-masing sebesar 134,67 N/ha (38,10 %) dan 85,33 N/ha (23,52 %). Hasil penelitian menunjukkan bahwa dengan diterapkan teknik pemanenan kayu RIL dapat mengurangi kerusakan tegakan tinggal tingkat tiang dan pohon sebesar 9,86 N/ha atau 36,61 % dari yang dihasilkan pada petak pemanenan kayu konvensional. Dengan demikian pemanenan kayu konvensional menyebabkan kerusakan tegakan tinggal lebih besar dibandingkan  dengan teknik RIL. ABSTRACTThis research examined the effect of reduced impact logging (RIL) to residual stand damages in natural tropical forest. A  research was done at  natural tropical forest of PT Inhutani II, East Kalimantan. The effect of reduced impact logging to residual stand were studied using the data of three plots with each size 100 m x 100 m are placed based on purposive sampling at landing, main skiddtrail and branch skiddtrail, respectively. The results of the research showed that that the potency of commercial timber species in conventional logging and RIL were 353.51 N/ha  and  362.7 N/ha. The number of residual stand damages caused by conventional logging and RIL were 134.67 N/ha (38.10 %) and 85.33 N/ha (23.52 %). Results of the research showed that reduced impact logging is reduced trees damages 9.86 N/ha (36.61 %) compared with conventional logging. These researches indicated that conventional logging in the tropical natural forest caused heavier damage on residual stand when compared with a reduced impact logging.
Co-Authors Bintang C. H. Simangunsong Daniel Murdiyarso Juang R Matangaran Muhdi Muhdi Ujang Suwarna