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Longer-term responses of rainforest erosional systems at different spatial scales to selective logging and climatic change

Walsh, R. P. D. and Bidin, K. and Blake, W. H. and Chappell, N. A. and Clarke, M. A. and Douglas, I. and Ghazali, R. and Sayer, A. M. and Suhaimi, J. and Tych, W. and Annammala, K. V. (2011) Longer-term responses of rainforest erosional systems at different spatial scales to selective logging and climatic change. Philosophical Transactions of the Royal Society Series B Biological Sciences, 366 (n/a). pp. 3340-3353. ISSN 0080-4622

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Abstract

Long-term (21–30 years) erosional responses of rainforest terrain in the Upper Segama catchment, Sabah, to selective logging are assessed at slope, small and large catchment scales. In the 0.44 km2 Baru catchment, slope erosion measurements over 1990–2010 and sediment fingerprinting indicate that sediment sources 21 years after logging in 1989 are mainly road-linked, including fresh landslips and gullying of scars and toe deposits of 1994–1996 landslides. Analysis and modelling of 5–15 min stream-suspended sediment and discharge data demonstrate a reduction in stormsediment response between 1996 and 2009, but not yet to pre-logging levels. An unmixing model using bed-sediment geochemical data indicates that 49 per cent of the 216 t km-2 a-1 2009 sediment yield comes from 10 per cent of its area affected by road-linked landslides. Fallout 210Pb and 137Cs values from a lateral bench core indicate that sedimentation rates in the 721 km2 Upper Segama catchment less than doubled with initially highly selective, low-slope logging in the 1980s, but rose 7–13 times when steep terrain was logged in 1992–1993 and 1999–2000. The need to keep steeplands under forest is emphasized if landsliding associated with current and predicted rises in extreme rainstorm magnitude-frequency is to be reduced in scale.

Item Type: Article
Journal or Publication Title: Philosophical Transactions of the Royal Society Series B Biological Sciences
Uncontrolled Keywords: erosion ; data-based mechanistic modelling ; sediment transport ; rainforest logging ; sediment fingerprinting ; radionuclides
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 40758
Deposited By: Mr Richard Ingham
Deposited On: 03 May 2011 13:44
Refereed?: Yes
Published?: Published
Last Modified: 06 Sep 2013 20:45
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/40758

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