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Forest Fires in the Brazilian Amazon |
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Notes for this articleLocation -> WCMC reprints.
Roraima: fires from August 97 to April 98 when rains quelled them. 33000 km2 + burned, of which 10000 km2 was forest. Fire in intact forest looks unimpressive; except in gaps it burns a few 10s of cm high, opening up the understorey. Many areas reburn multiple times following leaf fall and reignition of smouldering debris. Slow movement of front means that tree bases are exposed for long periods. Thin bark leads to damage, esp in smaller trees - about 40 of all stems killed, but bias to small size. Seedlings respond to light and nutrient fulush. Standing dead trees shed branches. Fuel load increases. Decreased canopy cover increases desiccation. If the forest then reburns in this susceptible state (within a few y), it burns long and fierce. About 40 of the surviving trees are killed again. Older trees have no survival adv this time. Canopy cover much reduced, to 35%. Colonisation by flammable vines and grasses. positive feedback. These conditions seen already in the Tailandia region, which has a fire return interval of 3 y in burned forest. Unburned fragmetnts within this matrix expected to burn within 7 years. Expected result is savanna and scrub vegetation over much of the present forest. Very depressing outlook.
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