Dendropanax dentigerus, Dendropanax morbiferus, Dendropanax trifidus, flavonoids, morphology

This study was conducted at the Acacia and Eucalyptus plantations and an unplanted area in Vietnam to firstly compare the appearance of native tree species between different plantations and an unplanted area, and secondly to examine the effect of planting densities and distances from the natural forest to plantations on the appearance and successful growth of native tree species. The area had previously suffered from many forest fires, grazing activity and shifting cultivation until 1990, and consequently had become degraded with low species diversity, low vegetation cover and low soil fertility. Circular plots of 200 m2 were used to collect data from January to April, 2004. Several diversity indices were recorded to evaluate the species diversity in the plantations and unplanted area. A total of 22 regenerated native tree species were found in the plantation of Acacia auriculiformis with a density of 860 trees per ha. In this plantation, the best planting density was 1,660 trees per ha. The lowest density was 467 trees per ha for a plantation of Eucalyptus camaldulensis with 12 regenerated native tree species. The number of regenerated native tree species and their density abundance in plantations at 300 m away from the natural forest were half of those at a distance of 50 m away. KCI Citation Count: 0