Research on logging: reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions
Reduced-impact logging (RIL) and conventional techniques (CNV) were compared in a mixed dipterocarp hill forest in Malinau, East Kalimantan. Damage was evaluated using pre- and post-harvesting assessments in 24 one-hectare sample plots. RIL techniques nearly halved the number of trees destroyed (36 vs. 60 trees/ha). RIL's main benefit was in the reduction of skidding damage (9.5% of the original tree population in RIL vs. 25% in CNV). Before logging, mean canopy openness in CNV (three plots only) and RIL (9 plots) was similar (3.6 and 3.1%) and not significantly different. After logging, the mean canopy openness was significantly higher in CNV with 19.2% than in RIL 13.3%. At a larger scale, the area of skidtrail per unit timber volume extracted was halved in the RIL compartment (15 m2 vs. 27 m2 m-3 for CNV). However, under high felling intensities (>8 trees/ha), both stand damage and canopy disturbance in RIL approached those recorded in CNV. Over this eight tree-felling threshold the effectiveness of RIL in reducing tree damage is limited. In mixed dipterocarp forest where harvestable timber density generally exceeds 10 trees/ha, a minimum diameter-felling limit is insufficient to keep extraction rates below 8 trees/ha. Based on these new results and previous studies in Borneo, we suggest three new rules: (1) to keep a minimum distance between stumps of ca. 40 m, (2) to ensure only single tree gaps using directional felling, (3) to harvest only stems with 60-100 cm dbh. Foresters, policy makers and certifiers should consider these as criteria for sustainable forest management.
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Format: | Book Chapter biblioteca |
Language: | English |
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CIFOR and ITTO
2002
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Subjects: | selective felling, dipterocarpaceae, logging, damage, silvicultural systems, assessment, |
Online Access: | https://hdl.handle.net/10568/18652 https://www.cifor.org/knowledge/publication/1178 |
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dig-cgspace-10568-186522023-02-15T01:17:28Z Research on logging: reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions Sist, P. Sheil, Douglas Kartawinata, K. Priyadi, H. selective felling dipterocarpaceae logging damage silvicultural systems assessment Reduced-impact logging (RIL) and conventional techniques (CNV) were compared in a mixed dipterocarp hill forest in Malinau, East Kalimantan. Damage was evaluated using pre- and post-harvesting assessments in 24 one-hectare sample plots. RIL techniques nearly halved the number of trees destroyed (36 vs. 60 trees/ha). RIL's main benefit was in the reduction of skidding damage (9.5% of the original tree population in RIL vs. 25% in CNV). Before logging, mean canopy openness in CNV (three plots only) and RIL (9 plots) was similar (3.6 and 3.1%) and not significantly different. After logging, the mean canopy openness was significantly higher in CNV with 19.2% than in RIL 13.3%. At a larger scale, the area of skidtrail per unit timber volume extracted was halved in the RIL compartment (15 m2 vs. 27 m2 m-3 for CNV). However, under high felling intensities (>8 trees/ha), both stand damage and canopy disturbance in RIL approached those recorded in CNV. Over this eight tree-felling threshold the effectiveness of RIL in reducing tree damage is limited. In mixed dipterocarp forest where harvestable timber density generally exceeds 10 trees/ha, a minimum diameter-felling limit is insufficient to keep extraction rates below 8 trees/ha. Based on these new results and previous studies in Borneo, we suggest three new rules: (1) to keep a minimum distance between stumps of ca. 40 m, (2) to ensure only single tree gaps using directional felling, (3) to harvest only stems with 60-100 cm dbh. Foresters, policy makers and certifiers should consider these as criteria for sustainable forest management. 2002 2012-06-04T09:08:39Z 2012-06-04T09:08:39Z Book Chapter Sist, P., Sheil, D., Kartawinata, K., Priyadi, H. 2002. Research on logging: reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions . In: CIFOR. ITTO project PD 12/97 Rev.1 (F): forest, science and sustainability: the Bulungan model forest: technical report phase 1, 1997-2001. :26-38. Bogor, Indonesia, CIFOR and ITTO. https://hdl.handle.net/10568/18652 https://www.cifor.org/knowledge/publication/1178 en CIFOR and ITTO |
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selective felling dipterocarpaceae logging damage silvicultural systems assessment selective felling dipterocarpaceae logging damage silvicultural systems assessment |
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selective felling dipterocarpaceae logging damage silvicultural systems assessment selective felling dipterocarpaceae logging damage silvicultural systems assessment Sist, P. Sheil, Douglas Kartawinata, K. Priyadi, H. Research on logging: reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions |
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Reduced-impact logging (RIL) and conventional techniques (CNV) were compared in a mixed dipterocarp hill forest in Malinau, East Kalimantan. Damage was evaluated using pre- and post-harvesting assessments in 24 one-hectare sample plots. RIL techniques nearly halved the number of trees destroyed (36 vs. 60 trees/ha). RIL's main benefit was in the reduction of skidding damage (9.5% of the original tree population in RIL vs. 25% in CNV). Before logging, mean canopy openness in CNV (three plots only) and RIL (9 plots) was similar (3.6 and 3.1%) and not significantly different. After logging, the mean canopy openness was significantly higher in CNV with 19.2% than in RIL 13.3%. At a larger scale, the area of skidtrail per unit timber volume extracted was halved in the RIL compartment (15 m2 vs. 27 m2 m-3 for CNV). However, under high felling intensities (>8 trees/ha), both stand damage and canopy disturbance in RIL approached those recorded in CNV. Over this eight tree-felling threshold the effectiveness of RIL in reducing tree damage is limited. In mixed dipterocarp forest where harvestable timber density generally exceeds 10 trees/ha, a minimum diameter-felling limit is insufficient to keep extraction rates below 8 trees/ha. Based on these new results and previous studies in Borneo, we suggest three new rules: (1) to keep a minimum distance between stumps of ca. 40 m, (2) to ensure only single tree gaps using directional felling, (3) to harvest only stems with 60-100 cm dbh. Foresters, policy makers and certifiers should consider these as criteria for sustainable forest management. |
format |
Book Chapter |
topic_facet |
selective felling dipterocarpaceae logging damage silvicultural systems assessment |
author |
Sist, P. Sheil, Douglas Kartawinata, K. Priyadi, H. |
author_facet |
Sist, P. Sheil, Douglas Kartawinata, K. Priyadi, H. |
author_sort |
Sist, P. |
title |
Research on logging: reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions |
title_short |
Research on logging: reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions |
title_full |
Research on logging: reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions |
title_fullStr |
Research on logging: reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions |
title_full_unstemmed |
Research on logging: reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions |
title_sort |
research on logging: reduced-impact logging in indonesian borneo: some results confirming the need for new silvicultural prescriptions |
publisher |
CIFOR and ITTO |
publishDate |
2002 |
url |
https://hdl.handle.net/10568/18652 https://www.cifor.org/knowledge/publication/1178 |
work_keys_str_mv |
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