Regeneration characteristics of Melientha suavis in Cu Lao Cham, Hoi An city, Quang Nam province

Abstract

The growth rate of Melientha suavis Pierre in Cu Lao Cham is slow, particularly in the period of regeneration. It’s possible to define the development stages of regeneration by morphological and growth characteristics. In the early stage of regeneration (sprouting seedlings and seedlings), the root is not only the function of environment assimilation but also plays an important role in nutrient accumulation and ensuring the survival of the plant. Stems in the stage of seedlings often change the top  to adapt to the unfavorable conditions of the environment. There is a strong variation in the density of seedlings in the transition period from sprouting seedlings and seedlings (H < 20 cm) to the first height class (H = 20 - 40 cm) of the unpromising offspring stage with a reduction rate of 7.84 times. In the next height classes, the decrease in the number of individuals in the next two classes is unchanged by 1.66 - 1.74 times. The main reason for changing seedling numbers is due to the drought and lack of light. The quality of regeneration and the percentage of regeneration by shoots increased gradually with the age. From the stage of unpromising offspring to promising offspring proportion of high (A) and low (C) seedling quality are 60.20% and 15.92% so compared to 65.49% và 5.31%, respectively. The percentage of seedlings from buds is 0.39% and 30.09%. The seedlings have a clump distribution. The frequency of these seedlings in the plots and the average individual density was high (50% and 1,266 individuals/ha). The level of distributional dependence of the regeneration on the mature trees of this species is around 90%