The objectives of the application of geographic information systems for Bretschneidera
sinensis Hemsl. Natural potential site identification in Doi Phu Kha National Park, Nan Province
are including as 1) to identify plant community characteristics of Bretschneidera sinensis Hemsl.
In natural site 2) to identify the relationship model between some physical and soil properties with
an appearance of Bretschneidera sinensis Hemsl. In natural site and 3) to apply GIS for natural
potential site identification of Bretschneidera sinensis Hemsl.
The result shows that plant community of Bretschneidera sinensis Hemsl. In Doi Phu Kha
National Park Nan province is identified as hill evergreen forest. It is consisted of plant in 18
families, 26 genus and 28 species. The most important species are Macaranga denticulate,
Bretschneidera sinensis, Elaeocarpus braceanus, Schima wallichii and Syzygium helferi at the IVI
of 62.25, 41.85, 25.71, 22.90 and 16.52 respectively. The relationship model of some physical
factors and soil properties using linear regression analysis has shown the accuracy level of 51 %.
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 Bretschneidera sinensis Hemsl. Using GIS has shown
the high, moderately and low potential levels of 315,532.81, 448,798.44 and 294,029.68 rais
respectively.