SOME STRUCTURAL CHARACTERISTICS AND REGENERATION OF POOR AND EXHAUSTED NATURAL FORESTS IN QUANG NINH PROVINCE PROVINCE

Abstract

Research on the structural characteristics and regeneration of poor and exhausted natural forests in Quang Ninh was conducted through 24 plots of 2000m² area, 12 plots/state showed that, the density of the timber ranges from 610 - 1,510 trees/ha in the poor forest and from 240 - 950 trees/ha in the exhausted forest. The average diameter at breast height of timber ranges from 11 - 11.6 cm and the average height ranges from 9.3 - 11.1m. In the poor forest, the number of tree species ranges from 15 - 52 species and the number of species participating in the composition formula from 2 - 8 species. The number of species in the exhausted broadleaf evergreen forest from 13 - 52 species with the number of species participating in the composition formula ranging from 3 - 7 species. The number of regenerated tree species in poor forest from 9 - 33 species and from 10 - 32 species in exhausted forest status. The density of regenerated trees in poor forest status ranges from 3,280 - 6,960 trees/ha and in exhausted forest status is 1,760 - 6,560 trees/ha and is mainly concentrated at height level below 1.0 m. Regenerated trees in both forest statuses are mainly randomly distributed with the proportion of regenerated trees of good quality dominating. This is the basis for promoting regeneration to improve the quality of poor natural forests in Quang Ninh province.