Tree diversity and its use in Buol District, Indonesia

We assessed plot-level, tree diversity and various tree-based systems in Buol District, Central Sulawesi Province, Indonesia: complex, clove, coconut and cacao agroforests; monoculture teak; and undisturbed and disturbed forests. The objectives were to assess the tree diversity of various land-use systems, to identify what tree species were used by the communities and to identify land-use systems that provided habitats for forest tree species. The indicators for tree diversity were tree species’ richness and tree composition collected using a Quick Biodiversity Survey approach. The use of tree diversity by the communities was assessed though focus-group discussions in three clusters of villages: the upstream and midstream of the Buol watershed; and the coastal area. We found that tree species’ richness in complex agroforests was 70% that of undisturbed forests. Only 5% of forest species regenerated in complex agroforestry systems, mostly represented by pioneer species. This condition indicated that although the complex agroforests species’ richness in Buol was relatively high, complex agroforests could not provide refugee for forest tree species. Therefore, conserving forests was very important for maintaining forest tree diversity in Buol. The remaining small patch of disturbed forest in Buol District was in a developing stage, indicated by higher species’ richness at sapling stage. The community in Buol had low dependency on forest species and were more interested in growing domesticated, commercial species. Not so long ago, farmers still harvested rattan from the forest but at the time of study the rattan population had diminished, most likely caused by overharvesting.

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