The role of extreme events in the impacts of selective tropical forestry on erosion during harvesting and recovery phases at Danum Valley, Sabah

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
I DouglasW Sinun

Abstract

Ten years' hydrological investigations at Danum have provided strong evidence of the effects of extremes of drought, as in the April 1992 El Niño southern oscillation event, and flood, as in January 1996. The 1.5 km2 undisturbed forest control catchment experienced a complete drying out of the stream for the whole 1.5 km of defined channel above the gauging station in 1992, but concentrated surface flow along every declivity from within a few metres of the catchment divide after the exceptional rains of 19 January 1996. Under these natural conditions, erosion is episodic. Sediment is discharged in pulses caused by storm events, collapse of debris dams and occasional landslips. Disturbance by logging accentuates this irregular regime. In the first few months following disturbance, a wave of sediment is moved by each storm, but over subsequent years, rare events scour sediment from bare areas, gullies and channel deposits. The spatial distribution of sediment sources changes with time after logging, as bare areas on slopes are revegetated and small gullies are filled with debris. Extreme storm events, as in January 1996, cause logging roads to collapse, with landslides leading to surges of sediment into channels, reactivating the...Continue Reading

References

Sep 1, 1995·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·K Ito

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Citations

Jun 3, 2006·Environmental Monitoring and Assessment·Dimitriou Elias, Zacharias Ierotheos
Oct 19, 2011·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·R P D WalshK V Annammala
Aug 20, 2015·The Science of the Total Environment·J TusetR J Batalla
Jul 22, 2008·Conservation Biology : the Journal of the Society for Conservation Biology·J W Ferry SlikDouglas Sheil
Aug 18, 2009·Conservation Biology : the Journal of the Society for Conservation Biology·Murilo S DiasJansen Zuanon
Sep 14, 2006·Journal of Human Evolution·Andrea B Taylor, Carel P van Schaik
Sep 13, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Rajat KarnatakKlaus Lehnertz
Jul 15, 2017·Ecohydrology : Ecosystems, Land and Water Process Interactions, Ecohydrogeomorphology·Sarah H LukeDavid C Aldridge

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