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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Bibliographic Details
Main Authors: Sist, P., Sheil, Douglas, Kartawinata, K., Priyadi, H.
Format: Book Chapter biblioteca
Language:English
Published: CIFOR and ITTO 2002
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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spelling 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
institution CGIAR
collection DSpace
country Francia
countrycode FR
component Bibliográfico
access En linea
databasecode dig-cgspace
tag biblioteca
region Europa del Oeste
libraryname Biblioteca del CGIAR
language English
topic selective felling
dipterocarpaceae
logging
damage
silvicultural systems
assessment
selective felling
dipterocarpaceae
logging
damage
silvicultural systems
assessment
spellingShingle 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
description 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
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