Tropical deforestation has become a major concern for the world community. Many study on the impact of forest disturbance on biological diversity has been documented especially in the tropical Sulawesi Indonesia (Walter et al. 2003 ; Schulze et al. 2004 ; Aryanti et al 2005; Kessler et al. 2005 ; Pitopang 2002, 2004, 2006). Some studies reveal conspicuously reduced species richness in secondary or degraded rainforests (Brearley et al. 2004 ; Pitopang 2002). Increasing attention is now being placed on tropical secondary forest because the sustainable use of the resources they provide is essential for the continued protection of undisturbed primary forest areas.
Secondary forests may act as buffer zones and serve as a habitat for forest plants and animals displaced from primary forest which has been destroyed. They may also act as reservoirs for recolonization and as corridors between remaining primary forest fragments.
I presented a preliminary result of composition of a 35-40 year old secondary rainforest at the Lore Lindu National Park, Central Sulawesi, Indonesia. Four 0.25 ha plots were established in the Toro village, at the western part border of the National Park at elevation 950 m asl.), Individually all big trees (dbh > 10 cm) was numbered with tree tags and their position in the plot mapped, crown diameter and dbh measured, whereas trunk as well as total height measured by Vertex. The result show that We recorded 482 individual of tree and 2408 sapling (dbh 2-9.9 cm) per ha. Tree species were mainly composed by Dracontamelon dao Merr (Anacardiaceae), Cyathocalyx acuminatus R.C. Rob (Annonaceae), Lithocarpus induta Blume (Fagaceae), Pangium edule Reinw. (Flacourtiaceae), Alstonia scholaris R.Br (Apocynaceae), Arenga pinnata (Wurb) Merr (Arecaceae), Elaeocarpus macropus Warb, Elaeocarpus octopetalus Merr (both Elaeocarpaceae), Palaquium luzoniense (Fern-Vaill) Vidal (Sapotaceae), Drypetes minahassae (Boerl. & Koord) Pax. & K. Hoffm (Euphorbiaceae), Aporosa lucida (Miq) Airy Shaw etc. Whereas, the sapling species were mainly consisted of Osmoxylon massarangense Phillipson (Araliaceae), Cyathocalyx acuminatus R.C. Rob (Annonaceae), Ilex cymosa Blume (Aquifoliaceae), Pometia pinnata (Sapindaceae), Areca vestiaria Giseke, Pinanga caesea Blume, Arenga undulatifolia Becc (Arecaceae).
Written by : Dr. Ramadanil Pitopang