Abstract

Kopachon, S. (1995)

Effects of Heat Treatment (60-70° C) on Seed Germination of some Native Trees on Doi Suthep

Fifty species of native trees were collected from 27 families, 45 genera from Doi Suthep. It was found that 29 species germinated, 11 species from deciduous forest, 16 species from primary evergreen seasonal hardwood forest, and other 2 species from deciduous + evergreen forest. The tree seeds of 9 species responded to wet heat treatment (hot water 60-70° C, 20 minutes) in positive relationship, 9 species responded to dry heat treatment (hot sand 60-70° C, 20 minutes) and other 5 species have not responded to heat treatments. Germination type was divided to 5 patterns: (1) epigeal type a 34%, (2) epigeal type b 28%, (3) semi-hypogeal 15%, (4) hypogeal 20% and (5) durian 3%. Some knowledge of this study may be used for forest regeneration and seedling development in natural forest.