Regeneration process in a mixed deciduous forest with teak at Mae Huad, Changwat Lampang [Thailand]
1989
Aporn Charoenniyom
Four important species (Tectona grandis Linn., Pterocarpus macrocarpus Kurz, Millettia brandisiana Kurz and Lepisanthes tetraphylla Radlk) DBH and H distribution for tree larger than 4.5 cm in DBH were respectively L-shaped and bell-shaped suggesting that trees are in a stationary stage or well regeneration. An analysis of spatial distribution pattern employing I alpha-index reveals that total individuals showed random while the four dominant species showed contagious distribution. From m*-m regression correspondes well with I alpha-index. The canopy layer was a mosaic of patches (85-563 square m patch area) which had different mean age. Only even-aged patches were found and trees composing these patches are called even-aged trees. Maximum and mean size of gaps in l ha plot was 300 square m and 120 square m respectively. Gap area was about 21.30 % of the total land area. Trees regenerate in the gaps made by the falling or death of one or several canopy trees. The concentration of gap formation in particular years was not observed. On average, 0.44-0.88 canopy trees per hectare died and a gap of 35.5-71.0 square m hectare was formed annually. The time scale of the forest growth cycle was determined by tree density, basal area, H* and aboveground biomass was found to be in three periods of 0-60, 60-110 and 110-225 years, which respectively corresponded to the gap, building and mature phases, which were described by Watt (1947) and Whitmore (1982)
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