Increased damage from fires in logged forests during droughts caused by El Niño

In 1997–98, fires associated with an exceptional drought caused by the El Niño/Southern Oscillation (ENSO) devastated large areas of tropical rain forests worldwide. Evidence suggests that in tropical rainforest environments selective logging may lead to an increased susceptibility of forests to fire. We investigated whether this was true in the Indonesian fires, the largest fire disaster ever observed. We performed a multiscale analysis using coarse- and high-resolution optical and radar satellite imagery assisted by ground and aerial surveys to assess the extent of the fire-damaged area and the effect on vegetation in East Kalimantan on the island of Borneo. A total of 5.2 ± 0.3 million hectares including 2.6 million hectares of forest was burned with varying degrees of damage. Forest fires primarily affected recently logged forests; primary forests or those logged long ago were less affected. These results support the hypothesis of positive feedback between logging and fire occurrence. The fires severely damaged the remaining forests and significantly increased the risk of recurrent fire disasters by leaving huge amounts of dead flammable wood.

[1]  Richard K. Moore,et al.  Microwave Remote Sensing, Active and Passive , 1982 .

[2]  R. Buschbacher,et al.  A disturbing synergism between cattle ranch burning practices and selective tree harvesting in the eastern Amazon. , 1985 .

[3]  A. Fung,et al.  Microwave Remote Sensing Active and Passive-Volume III: From Theory to Applications , 1986 .

[4]  Tropical Rain Forests And The World Atmosphere , 1987 .

[5]  Christopher Uhl,et al.  Fire in the Venezuelan Amazon 1: Fuel biomass and fire chemistry in the evergreen rainforest of Venezuela , 1988 .

[6]  J. G. Goldammer,et al.  The Impact of Droughts and Forest Fires on Tropical Lowland Rain Forest of East Kalimantan , 1990 .

[7]  J. G. Goldammer,et al.  Fire in the tropical biota : ecosystem processes and global challenges , 1991 .

[8]  Harold Brookfield,et al.  In Place of the Forest: Environmental and Socio-Economic Transformation in Borneo and the Eastern Malay Peninsula , 1997 .

[9]  A. Schulte,et al.  Dipterocarp forest ecosystems: towards sustainable management , 1996 .

[10]  FIRE IN DIPTEROCARP FORESTS , 1996 .

[11]  C. Uhl,et al.  FIRE IN AMAZONIAN SELECTIVELY LOGGED RAIN FOREST AND THE POTENTIAL FOR FIRE REDUCTION , 1997 .

[12]  M. Cochrane,et al.  Fire as a Recurrent Event in Tropical Forests of the Eastern Amazon: Effects on Forest Structure, Biomass, and Species Composition 1 , 1999 .

[13]  C. Potter,et al.  Large-scale impoverishment of Amazonian forests by logging and fire , 1999, Nature.

[14]  Johann G. Goldammer,et al.  Forests on Fire , 1999, Science.

[15]  Florian Siegert,et al.  Monitoring of deforestation and land use in Indonesia with multitemporal ERS data , 1999 .

[16]  D. Nepstad,et al.  Positive feedbacks in the fire dynamic of closed canopy tropical forests , 1999, Science.

[17]  F. Siegert,et al.  Use of multitemporal ERS-2 SAR images for identification of burned scars in south-east Asian tropical rainforest , 2000 .

[18]  Florian Siegert,et al.  The 1998 Forest Fires in East Kalimantan (Indonesia): A Quantitative Evaluation Using High Resolution, Multitemporal ERS-2 SAR Images and NOAA-AVHRR Hotspot Data , 2000 .

[19]  Trial by Fire , 2000 .

[20]  P. Jepson,et al.  The End for Indonesia's Lowland Forests? , 2001, Science.

[21]  S. Page,et al.  The amount of carbon released from peat and forest fires in Indonesia during 1997 , 2002, Nature.

[22]  Martin J. Wooster,et al.  Small‐scale experimental testing of fire radiative energy for quantifying mass combusted in natural vegetation fires , 2002 .