The Effect of Environmental Factors and Seedling Age on the Survival and Growth of Siamese Rosewood (Dalbergia cochinchinensis Pierre) for Enrichment Planting at Khao Yai National Park : Results From The First Year

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Juthathip Rossarang
Somporn Maelim
Wathinee Suanpaga

Abstract

          The survival rate, growth, and relationship between the environmental factors and seedling growth of Dalbergia cochinchinensis Pierre were reported. Planting was considered as treatment, with 6-months-old, 1-year-old, and 2-years-old seedlings planted in a dry evergreen forest, ecotone zones of deciduous forest mixed with dry evergreen forest, and mixed deciduous forest. The environmental factors were recorded monthly for a year. Growth and survival of D. cochinchinensis seedlings was measured every 3 months for a year. The results indicate that the survival rate of seedlings was significantly different among the various age classes of seedlings and among planting sites (p <0.05). We observed the highest average survival rate for 6-months-old seedlings growing in dry evergreen forest. The averages of monthly increment in diameter at ground level (D0) and height, for seedlings in various age classes, were significantly different during the first 3 months only. The averages of monthly increment in diameter at ground level (D0) of 6-months-old, 1-year-old and 2-years-old seedling were 0.34, 0.38, and 0.11 mm./month, respectively, while the averages of increment in height were found to be 1.17, 0.98, and 4.11 cm./month, respectively. The studies of relationships between growth characteristics of D. cochinchinensis seedlings and the environmental factors showed that soil temperature, rainfall, and soil moisture content were significantly related to diameter at ground level (D0) and height of seedlings, while air temperature, rainfall, and light intensity were significantly related to their survival rate. With regards to the survival rate and the growth of D. cochinchinensis, it can be concluded that seedlings between the ages of 6 months - 1 year were suitable in enrichment planting.


 


Keywords: Dalbergia cochinchinensis, Environmental factors, Growth rate, Survival rate, Khao Yai national park

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