Growth of Tree Species as Enrichment Planting at Khuan Khreng Swamp Forest, Nakhon Si Thammarat Province

Main Article Content

Sutasinee Nunsung
Kobsak Wanthongchai
Somporn Maelim

Abstract

The objectives of this study were to find survival rate, height growth, and diameter at root collar growth of each tree species planted through different methods. The study was conducted in 3 patterns of unburned areas:
1) mounded with 50% Melaleuca cajuputi thinning, 2) mounded with 30% Melaleuca cajuputi thinning, and
3) mounded with 10% Melaleuca cajuputi thinning; and 4 patterns of unburned areas: 1) unmounded, 2) mounded, 3) mounded with small gap opening (2.2 m radius), and 4) mounded with a large gap opening (4.6 m radius). Nine tree species were selected randomly, spaced at a distance 4 m x 4 m, and 100 trees in each area. The study found that the overall survival rate and the survival rate of each tree species, both in unburned and burned areas, was not significantly different. The height and diameter at root collar growth at the age of 2 years, both in unburned and burned areas, was not significantly different between each type of planting in most species. However, in unburned areas, Fagraea fragrans had a highly significant difference (p<0.01) in their diameter at root collar, while Horsfieldia irya had a significant difference (p<0.05). Considering the relative height and diameter at root collar growth rate, Eugenia polyantha and Polyalthia glauca had highly significant difference (p<0.01), which had highest relative growth rate in mounded area with 10% Melaleuca cajuputi thinning. In burned areas, it was found that Fagraea fragrans, Eugenia grandus, and Horsfieldia irya had a significant difference (p<0.05) in height and diameter at root collar. Considering the relative height and diameter at root collar growth rate, it appeared that Eugenia polyantha, Fagraea fragrans, Eugenia grandus, and Horsfieldia irya had a significant difference (p<0.05), which had the highest relative growth rate in mounded areas. In summary, the mounded areas had a higher survival rate, relative height growth, and relative diameter at root collar growth for most plants. Planting in unburned areas appeared to have a higher survival rate than planting in burned areas.

Article Details

How to Cite
Nunsung, S., Wanthongchai, K., & Maelim, S. (2020). Growth of Tree Species as Enrichment Planting at Khuan Khreng Swamp Forest, Nakhon Si Thammarat Province. Thai Journal of Forestry, 39(1), 71–85. Retrieved from https://li01.tci-thaijo.org/index.php/tjf/article/view/245964
Section
Original Articles

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