Long-term erosion and surface roughness change of rain-forest terrain following selective logging,Danum Valley,Sabah, Malaysia |
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| Institution: | 1. National Soil Resources Institute, Cranfield University, Silsoe, Bedfordshire, MK45 4DT, United Kingdom;2. Department of Geography, University of Wales Swansea, Swansea SA2 8PP, United Kingdom;2. Department of Cardic Surgery, Heart Centre, University Hospital Heidelberg, Heidelberg, Germany;1. Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway;2. Division of Synchrotron Radiation Research, Lund University, Box 117, SE-221 00 Lund, Sweden;3. Department of Chemical Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway;1. SINTEF Energy Research, NO-7465 Trondheim, Norway;2. SINTEF Materials and Chemistry, NO-0314 Oslo, Norway;1. Department of Land Management and Systems, Faculty of Agribusiness and Commerce, Lincoln University, Lincoln, New Zealand;2. Conservation Department, GP Pusaka Sdn. Bhd., Bintulu, Sarawak, Malaysia;3. Sarawak Forestry Corporation, Botanical Research Centre Semenggoh, Kuching, Sarawak, Malaysia;1. Department of Zoology, University of Oxford, South Parks Road, Oxford, OX1 3PS, UK;2. Department of Life Sciences, University of Sussex, Falmer, Brighton, BN1 9RH, UK |
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| Abstract: | When rain forest is logged, rills and gullies are often initiated on heavily disturbed and compacted terrain components; whether and for how long they continue to enlarge following logging is critical as regards the recovery and sustainability of the regenerating forest. This paper examines these two issues in logged rain forest in northeastern Borneo. Results are presented of an investigation into how soil erosion rates and surface topography varies in selectively logged forests at different stages of regeneration (up to 15 years after logging) in Danum Valley, eastern Sabah, Malaysia. Measurements were made of changes in ground level and surface roughness at over 100 transect sites over periods of 1–15 years using the erosion bridge (microprofiler) technique. In the complex mosaic of the post-logging regenerating forest, attention focused on key features, notably abandoned logging tracks, gullies, heavily disturbed or compacted areas and road-related landslides and comparisons are made with primary forest terrain. The role of extreme rainstorms in controlling the temporal pattern of post-logging erosion in both regenerating and primary forest is demonstrated. The different situations in which rills and gullies initiated during or following logging enlarge or disappear in post-logging terrain are highlighted. The implications of the results for slope evolution and sustainable rain-forest management policies are briefly considered. |
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