Stand-level dieback etiology and its consequences in the forests of Papua New Guinea |
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| Authors: | F Arents |
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| Institution: | (1) PNG Forestry College, POB 92, Bulolo, Papua New Guinea;(2) Present address: Queen Victoria Terrace, POB E176, 2699 Canberra, ACT, Australia |
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| Abstract: | Stand-level dieback inNothofagus, mangrove andEucalyptus deglupta forests is examined. InNothofagus and mangrove forests, groups of largely even-aged trees die simultaneously, possibly triggered by drought stress which may
directly affect the trees inNothofagus forests or indirectly increase water salinity in mangroves. Lightning strikes may be an additional dieback trigger in mangroves.
Crown decline only was observed inE. deglupta forests and this may be associated with water-logging during periods of exceptionally high rainfall. Examination of rainfall
records shows that severe droughts occur periodically in association with El Nino Southern Oscillations in the Pacific Ocean. |
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