The objectives of the application of geographic information systems for Tectona grandis L.f. natural potential site identification in Mae Yom National Park Phrae Province are including as 1) to identify plant community characteristics of Tectona grandis L.f. Alston in natural site 2) to identify the relationship model between some physical and soil properties with an appearance of Tectona grandis L.f. in natural site and 3) to apply GIS for natural potential site identification of Tectona grandis L.f..
The result shows that plant community of Tectona grandis L.f. in Mae Yom National Park Phrae Province is identified as tropical rain forest with the species diversity of 1.31. It is consisted of plant in 28 families, 58 genus, and 76 species. The most important species are Tectona grandis Pterocarpus macrocarpus Xylia xylocarpa Cananga latifolia Schleichera oleosa at the IVI of 119.95, 18.77, 17.08, 10.68 and 10.20 respectively. The relationship model of some physical factors and soil properties using linear regression analysis has shown the accuracy level of 62 %. The significant factors are including slope, aspect, elevation, distance from surface water, particle of sand, silt, clay, soil reaction, organic matter, phosphorus, potassium, magnesium, and calcium. The natural potential site identification for Tectona grandis L.f. using GIS has shown the high, moderately and low potential levels of 48685.82 , 139064.73 , and 96468.2 rais respectively.