Effects of Heat Treatments on Seed Germination of Some Native Tree Species on Doi Suthep

ABSTRACT: Fifty species of native trees were collected from 27 families, 45 genera from Doi Suthep. Twenty-nine species germinated, 11 species from deciduous forest, 16 species from primary evergreen seasonal hardwood forest and other 2 species from deciduous + evergreen forest. Seeds of 9 species responded positively to wet heat treatment (hot water 60-70° C, 20 minutes), 9 species responded positively to dry heat treatment (hot sand 60-70° C, 20 minutes) and other 5 species did not respond to either heat treatments. Germination types were: (1) epigeal-type-A (34% of species), (2) epigeal-type-B 28%, (3) semi-hypogeal 15%, (4) hypogeal 20% and (5) durian 3%. There results of this study can be used to improve sock production for forest restoration projects and increase understanding of seedling development patterns in natural forest.

Written in Thai, with English abstract.